Summary of SPT

The SPT can be a useful in situ test, provided that engineers carefully control the test. The test results can be reliable if the equipment and procedures are controlled. The following procedure for performing the SPT is suggested:

• 1. Use a calibrated automatic hammer set to a test rate of 30-40 blows/min;
• 2. Use NW or AW (square or tapered thread) drill rods in lengths of 3.0 m (10 ft);
• 3. Use a 0.61 (24in.)-long split spoon without liners with an internal shoe diameter of
• 34.9 mm (1.375 in.) and an internal barrel diameter of 38.1mm (1.5 in.);
• 4. With the rods touching the bottom of the borehole but still being held, carefully mark three 0.15 m (6 in.) drive increments;
• 5. Drive the spoon a total of 0.46 m (18 in.) and record incremental blow counts for each
• 0.15 m (6 in.) increment;
• 6. Use only solid-stem or hollow-stem augers with an internal diameter not greater than
• 107.9 mm (4.25 in.) or 100 mm (4 in.) rotary wash boring to advance the borehole;
• 7. In coarse-grained soils below the water table, use drilling mud full depth inside the hollow stem augers or casing;
• 8. Always record the sample recovery;

Table 2.16 Summary of some reported correlations between SPT N-value and deep foundation side resistance

Note: f_s = p + aN (f, in units of kPa).

• 9. Field SPT blow counts should always be corrected for test procedures and the energy level of the hammer system. Blow count values should be reported as N_so.
• 10. Perform a torque test after completing the drive.

References

AASHTO, 1981. Standard Specifications for Transportation Materials and Methods of Sampling and Testing.

Agan, C. and Algin, H., 2014. Determination of Relationships between Menard Pressuremeter Test and Standard Penetration Test Data by Using ANN Model: A Case Study on the Clayey Soil in Sivas, Turkey. Geotechnical Testing Journal, ASTM, Vol. 37, No. 3, pp. 1-12.

Ajayi, L.A. and Balogun, L.A., 1988. Penetration Testing in Tropical Lateritic and Residual Soils - Nigerian Experience. Proceedings of the 1st International Symposium on Penetration Testing, Vol. l,pp. 315-328.

Akbas, S. and Kulhawy, F., 2008. Case History of SPT Energy Ratio for an Automatic Hammer in Northeastern U.S. Practice. Proceedings of the 3rd International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 2, pp. 1241-1245.

Akbas, S.O. and Kulhawy, F.H., 2010. Characterization and Estimation of Geotechnical Variability in Ankara Clay: A Case History. Geotechnical and Geological Engineering, Vol. 28, pp. 619-631.

Akino, N. and Sahara, M., 1994. Strain-Dependency of Ground Stiffness Based on Measured Ground Settlement. Proceedings of the International Symposium on Pre-Failure Deformation of Geomaterials, Vol. 1, pp. 181-187.

Anagnostopoulos, A.G., Papadopoulos, B.P., and Kavvadas, M.J., 1991. Direct Estimation of Settlements on Sand, Based on SPT Results. Proceedings of the 10th European Conference on Soil Mechanics and Foundation Engineering, Vol. 2, pp. 293-296.

Anbazhagan, P., and Sitharam, T., 2010. Relationship between Low Strain Shear Modulus and Standard Penetration N Values. Geotechnical Testing Journal, ASTM, Vol. 33, No. 2, pp. 1-15.

Anbazhagan, P., Parihar, A, and Rashmi, H., 2012. Review of Correlations between SPT N and Shear Modulus: A New Correlation Applicable to any Region. Soil Dynamics and Earthquake Engineering, Vol. 36, pp. 52-69.

Athanasopoulos, G., 1994. An Empirical Correlation VS-NSPT and an Evaluation of Its Reliability. Proceedings of the 2nd International Conference on Earthquake Resistant Construction and Design, pp. 219-226.

Balachandran, K., Liu, K., Cao, L. and Peaker. Statistical Correlations between undtained shear strength (C„) and both SPT N-value and net limit pressure (P_L) for cohesive glacial tils. Proceedings GoeOttawa, Canadian Geotechncial Society, 8 pp.

Bang, E.-S. and Kim, D.-S., 2007. Evaluation of Shear Wave Velocity Using SPT Based Uphole Method. Soil Dynamics and Earthquake Engineering, Vol. 27, pp. 741-758.

Barksdale, R.D., Ferry, C.T., and Lawrence, J.D., 1986. Residual Soil Settlement from Pressuremeter Moduli. Use of In Situ Tests in Geotechnical Engineering, ASCE, pp. 447-461.

Barros, J. and Pinto, C., 1997. Estimation of Maximum Shear Moduli of Brazilian Tropical Soils from Standard Penetration Test. Proceedings of the 14th International Conference on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 29-30.

Batchelor, C., Goble, G., Berger, J., and Miner, R., 1995. Standard Penetration Test Energy Measurements on the Seattle ASCE Field Testing Program. Seattle Section of the American Society of Civil Engineers.

Bazaraa, A.R., 1967. Use of the Standard Penetration Test for Estimating Settlements of Shallow Foundations on Sand. Thesis presented to University of Illinois at Urbana, Illinois in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

Bazaraa, A.R. and Kurkur, M.M., 1986. N-Values Used to Predict Settlement of Piles in Egypt. Use of In Situ Tests in Geotechnical Engineering, ASCE, pp. 462-474.

Behpoor, L. and Ghahramani, A., 1989. Correlation of SPT to Strength and Modulus of Elasticity of Cohesive Soils. Proceedings of the 12th International Conference on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 175-177.

Berardi, R., Jamiolkowski, M., and Lancellotta, R., 1991. Settlement of Shallow Foundations in Sands-Selection of Stiffness on the Basis of Penetration Resistance. Geotechnical Engineering Congress, ASCE, Vol. 1, pp. 185-200.

Bergado, D.T., Alfaro, M., Bersabe, N., and Leong, K., 1993. Model Test Results of Sand Compaction Pile (SCP) Using Locally-Available and Low-Quality Backfill Soils. Proceedings of the 11th Southeast Asian Geotechnical Conference, pp. 313-318.

Biringen, E. and Davie, J., 2008. SPT Automatic Hammer Efficiency Revisited. Proceedings of the 6th International Conference on Case Histories in Geotechnical Engineering, Paper No. 4.06,

8 pp.

Borowczyk, M. and Frankowski, Z.B., 1981. Dynamic and Static Sounding Results Interpretation. Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Vol. 2, pp. 451-454.

Bosio, J.J., 1992. A New Way of Measuring the Soundness of Very Soft Rocks Using the “SPT” Test Equipment. Proceedings of the US/Brazil Geotechnical Workshop on Applicability of Classical Soil Mechanics Principles to Structured Soil, pp. 91-96.

Bosscher, P.J. and Showers, D.R., 1987. Effects of Soil Type on Standard Penetration Test Input Energy .Journal of Geotechnical Engineering, ASCE, Vol. 113, No. 4, pp. 385-389.

Bowles, J.E., 1988. Foundation Analysis and Design. McGraw-Hill, Inc., 4th Edition, New York.

Bozbey, I. and Togrol, E., 2010. Correlation of Standard Penetration Test and Pressuremeter Data: A Case Study from Turkey. Bulletin of Engineering Geology and Environment, Vol. 69, pp. 505-515.

Broms, B.B. and Flodin, N., 1988. History of Soil Penetration Testing. Proceedings of the 1st International Symposium on Penetration Testing, Vol. 1, pp. 157-220.

Brooker, E. and Ireland, H., 1965. Earth Pressure at Rest Related to Stress History. Canadian Geotechnical Journal, Vol. 1, No. 1, pp. 1-15.

Brown, R.E., 1977. Drill Rod Influence on Standard Penetration Test. Journal of the Geotechnical Engineering Division, ASCE, Vol. 103, No. GT11, pp. 1332-1336.

Bureau of Reclamation, U.S. Department of Interior, 1974. Earth Manual.

Burland, J.B. and Burbidge, M.C., 1985. Settlement of Foundations on Sand and Gravel. Proceedings of the Institute of Civil Engineers, Part 1, Vol. 78, pp. 1325-1381.

Cangir, B. and Dipova, N., 2017. Estimation of Undrained Shear Strength of Konyaalti Silty Clays. Indian Journal of Geo Marine Sciences, Vol. 46, No. 3, pp. 513-520.

Chang, M.F. and Broms, B.B., 1991. Design of Bored Piles in Residual Soils Based on Field Performance Data. Canadian Geotechnical Journal, Vol. 28, pp. 200-209.

Clayton, C.R.I., Hababa, M.B., and Simons, N.E., 1985. Dynamic Penetration Resistance and the Prediction of the Compressibility of a Fine-Grained Sand - A Laboratory Study. Geotechnique, Vol. 35, No. l,pp. 19-31.

Crova, R., Jamiolkowski, M., Lanellotta, R., and Presti, D.C.F., 1993. Geotechnical Characterization of Gravelly Soils at Massena Site: Selected Topics. Predictive Soil Mechanics, pp. 199-218.

Cubrinovski, M. and Ishihara, K., 2001. Correlation Between Penetration Resistance and Relative Density of Sandy Soils. Proceedings of the 15th International Conference on Soil Mechanics and Geotechnical Engineering, Vol. 1, pp. 393-396.

Daniel, C., Howie, J., and Sy, A., 2003. A Method for Correlating Large Penetration Test (LPT) to Standard Penetration Test (SPT) Blow Counts. Canadian Geotechnical Journal, Vol. 40, No. 1, pp. 66-77.

Daniel, C., Howie, J., Campanella, R., and Sy, A., 2004. Characterization of SPT Grain Size Effects in Gravels. Proceedings of the 2nd International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 1, pp. 299-303.

D’Appolonia, D.J., D’Appolonia, E., and Brissette, R.F., 1970. Closure of Settlement of Spread Footings on Sand. Journal of the Soil Mechanics and Foundation Division, ASCE, Vol. 96, No. SM2, pp. 754-761.

Das, U., 2014. A Study on the Effect of Distorted Sampler Shoe on Standard Penetration Test Result in Cohesionless Soil. International Journal of Innovative Research in Science, Engineering and Technology, Vol. 3, No. 10, pp. 16654-16558.

Davidson, J., Maultsby, J., and Spoor, K., 1999. Standard Penetration Test Energy Calibrations. Final Report Florida DOT Contract No. BB261, Department of Civil Engineering, University of Florida.

Decourt, L., 1982. Prediction of the Bearing Capacity of Piles Based Exclusively on N Values of the SPT. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 292-234.

Decourt, L., 1989. The Standard Penetration Test - State of the Art Report. Proceedings of the 12th International Conference on Soil Mechanics and Foundation Engineering. Vol. 4, pp. 2405-2416.

Decourt, L., 1994. The Behavior of a Building with Shallow Foundations on a Stiff Lateritic Clay. Vertical and Horizontal Deformations of Foundations and Embankments, ASCE, Vol. 2, pp. 1505-1515.

Decourt, L. and Quarsma, A.R, 1994. Practical Applications of thje Standard Penetration Test Complemented by Torque Measurements, SPT-T; Present Stage and Future Trends. Proceedings of the 13th International Conference on Soil Mechanics and Geotechnical Engineering, pp. 143-146.

DeGodoy, N.S., 1971. Discussion of the Standard Penetration Test. Proceedings of the 4th Pan American Conference on Soil Mechanics and Foundation Engineering, Vol. 3, pp. 100-103.

DeMello, V., 1971. The Standard Penetration Test. Proceedings of the 4th Panamerican Conference on Soil Mechanics, Vol. 1, pp. 1-86.

Denver, H., 1982. Modulus of Elasticity for Sand Determined by SPT and CPT. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 35-40.

Dikmen, U., 2009. Statistical Correlations of Shear Wave Velocity and Penetration Resistance for Soils .Journal of Geophysical Engineering, Vol. 6, pp. 61-72.

Dung, N. and Chung, G., 2013. Behavior of the Standard Penetration Test (SPT) in Sandy Deposits. Proceedings of the 3rd International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 1, pp. 365-373.

Esfehanizadeh, M., Nabizadeh, F., and Yazarloo, R., 2015. Correlation between Standard Penetration (N_SPT) and Shear Wave Velocity (V_s) for Young Coastal Sands of the Caspian Sea. Arab Journal of Geoscience, Vol. 8, pp. 7333-7341.

Fabbrocino, S., Lanzano, G., Forte, G., de Magistris, F., and Fabbrocino, G., 2015. SPT Blow Count vs. Shear Wave Velocity Relationship in the Structurally Complex Formations of the Molise Region (Italy). Engineering Geology, Vol. 187, pp. 94-97.

Fatehnia, M., Hayden, M., and Landschoot, M., 2015. Correlation between Shear Wave Velocity and SPT-N Values for North Florida Soil. Electronic Journal of Geotechnical Engineering, Vol. 20, pp. 12421-12430.

Fletcher, G.F.A., 1965. Standard Penetration Test: It’s Uses and Abuses. Journal of the Soil Mechanics and Foundation Division, ASCE, Vol. 91, No. SM4, pp. 67-75.

Frost, D.J., 1992. Evaluation of the Repeatability and Efficiency of Energy Delivered with a Diedrich Automatic SPT Hammer System. Report prepared for Diedrich Drill Inc., La Porte, IN.

Gautam, D., 2017. Empirical Correlation between Uncorrected Standard Penetration Resistance (N) and Shear Wave Velocity (V_s) for Kathmandu Valley, Nepal. Geomatics, Natural Hazards and Risk, Vol. 8, No. 2, pp. 496-508.

Giacheti, H.L., Pedrini, R., and Rocha, B., 2013. The Seismic SPT Test in a Tropical Soil and the G„/N Ratio. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, 4 pp.

Gibbs, H.J. and Holtz, W.G., 1957. Research on Determining the Density of Sands by Spoon Penetration Testing. Proceedings of the 4th International Conference on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 35-39.

Golder, H.Q., 1961. Discussion to Session IV. Proceedings of the 5th International Conference on Soil Mechanics and Foundation Engineering. Vol. 3, p. 163.

Granger, V.L., 1963. The Standard Penetration Test in Central Africa. Proceedings of the 3rd Regional Conference for Africa on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 153-156.

Hall, J.R., 1982. Drill Rod Energy as a Basis for Correlation of SPT Data. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 57-60.

Нага, A., Ohta, T, Niwa, M., Tanaka, S., and Banno, T, 1974. Shear Modulus and Shear Strength of Cohesive Soils. Soils and Foundations, Vol. 14, No. 3, pp. 1-12.

Harder, L.F. and Seed, H.B., 1986. Determination of Penetration Resistance for Coarse-Grained Soils Using the Becker Hammer Drill. Report UCB/EERC-86/06, Earthquake Engineering Research Center, University of California, Berkeley.

Harrison, C., Bonin, G., and Esford, F., 2017. Summary of Drilling and Large Penetration Test Program to Confirm the Density of Soils Subjected to Dynamic Compaction for the Bay-Goose Dike at the Meadowbank Gold Projects in Nunavut, Canada. Proceedings of GeoOttawa 2017, 9 pp.

Hasancebi, N and Ulusay, R., 2007. Empirical Correlations between Shear Wave Velocity and Penetration Resistance for Ground Shaking Assessments. Bulletin of Engineering Geology and the Environmnet, Vol. 66, pp. 203-213.

Hatanaka, M. and Feng, L., 2006. Estimating Relative Density of Sandy Soils. Soils and Foundations, Vol. 46, No. 3, pp. 299-313.

Hatanaka, M. and Uchida, A., 1996. Empirical Correlation Between Cone Resistance and Internal Friction Angle of Sandy Soils. Soils and Foundations, Vol. 36, No. 4, pp. 1-10.

Hettiarachchi, H. and Brown, T., 2009. Use of SPT Blow Counts to Estimate Shear Strength Properties of Soils: Energy Balance Approach. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 135, No. 6, pp. 830-834.

Heydarzadeh, A., Fahker, A., and Moradi, M., 2013. A Feasibility Study of Standard Penetration Test with Torque Measurement (SPT-T) in Iran. Proceedings of the 4th International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 1, pp. 553-559.

Hirayama, H., 1994. Secant Young’s Modulus from N-Value or c_u Considering Strain Levels. Proceedings of the International Symposium on Pre-Failure Deformation of Geomaterials, Vol. l,pp. 247-252.

Honeycutt, J., Kiser, S., and Anderson, J., 2014. Database Evaluation of Energy Transfer for Central Mine Equipment Automatic Hammer Standard Penetration Tests. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 140, No. 1, pp. 194-200.

Imai, T., 1977. P- and S-Wave Velocities of the Ground in Japan. Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering, Vol. 2, pp. 257-260.

Imai, T. and Tonouchi, K., 1982. Correlations of N Value with S-wave Velocity and Shear Modulus. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 67-72.

Ireland, H.O., Moretto, O., and Vargas, M., 1970. The Dynamic Penetration Test: A Standard That Is Not Standardized. Geotechnique, Vol. 20, No. 2, pp. 185-192.

Jafari, M., Shafiee, A., and Razmkhan, A., 2002. Dynamic Properties in Fine-Grained Soils in the South Tehran. Journal of Seismology and Earthquake Engineering, Vol. 4, pp. 25-35.

Jain, P.K. and Handa, S.C., 1979. In-Situ Penetration Resistance of Cohesionless Soils. Proceedings of the International Symposium on In Situ Testing of Soils and Rocks and Performance of Structures, pp. 203-206.

Jamiolkowski, M., Ghionna, V.N., Lancellotta, R., and Pasqualini, E., 1988. New Correlations of Penetration Tests for Design Practice. Proceedings of the 1st International Symposium on Penetration Testing, Vol.l, pp. 263-296.

Jinan, Z., 1985. Correlation between Seismic Wave Velocity and the Number of Blow of SPT and Depths. Selected Papers from the Chinese Journal of Geotechnical Engineering, ASCE, pp. 92-100.

Jones, G. A. and Rust, E., 1989. Foundations on Residual Soil Using Pressuremeter Moduli. Proceedings of the 12th International Conference on Soil Mechanics and Foundations Engineering, Vol. 1, pp. 519-523.

Kaito, T., Sakaguchi, S., Nishigaki, Y., Miki, K., and Yukami, H., 1971. Large Penetration Test. Tsuchi-to-Kiso, Vol. 629, pp. 15-21.

Kalteziotis, N., Sabatakakis, N., and Vasiliou, I., 1992. Evaluation of Dynamic Characteristics of Greek Soil Formations. Proceedings of the 2nd Flellenic Conference on Geotechnical Engineering, Vol. 2, pp. 239-246.

Kanai, S. and Yabuuchi, S., 1989. Bearing Capacity of Nodular Piles. Proceedings of the International Conference on Piling and Deep Foundations, Vol. 1, pp. 73-79.

Kayabasi, A., 2012. Prediction of Pressuremeter Modulus and Limit Pressure of Clayey Soils by Simple and Non-Linear Multiple Regression Techniques: A Case Study from Mersin, Turkey. Environmental Earth Sciences, Vol. 66, pp. 2171-2183.

Kelley, S.P. and Lens, J., 2010. Evaluation of SPT Hammer Energy Variability. Report to Vermont Department of Transportation, Geodesign.

Kelley, S.P. and Lutenegger, A.J., 2004. Unit Skin Friction from the Standard Penetration Test Supplemented with the Measurement of Torque. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 130, No. 4, pp. 540-543.

Kim, D.-S., Bang, E.-S., and Seo, W.-S., 2004. Evaluation of Shear Wave Velocity Profile Using SPT Based Uphole Test. Proceedings of the 2nd International Site Characterization Conference, Vol. l,pp. 707-712.

Kirar, B., Maheshawri, B., and Muley, P., 2016. Correlation between Shear Wave Velocity (V_s) and SPT Resistance (N) for Roorkee Region. International Journal of Geosynthetics and Ground Engineering, Vol. 2, No. 1, p. 9.

Kishida, H., 1967. Ultimate Bearing Capacity of Piles Driven into Loose Sand. Soils and Foundations, Vol. 7, No. 3, pp. 20-29.

Koester, J., Daniel, C., and Anderson, M., 2000. In Situ Investigation of Liquefiable Gravels.

Transportation Research Record No. 1714, pp. 75-82.

Koike, M., Matsui, T., and Matsui, K., 1988. Vertical Loading Tests of Large Bored Piles and Their Estimation. Proceedings of the 1st International Geotechnical Seminar on Bored and Angered Piles, pp. 531-536.

Kovacs, W.D., 1975. On Dynamic Shear Moduli and Poisson’s Ratios of Soil Deposits. Soils and Foundations, Vol. 15, No. 1, pp. 93-96.

Kovacs, W.D. and Salomone, L.A., 1982. SPT Hammer Energy Measurement. Journal of the Geotechnical Engineering Division, ASCE, Vol. 108, No. GT4, pp. 599-621.

Kovacs, W.D., Salomone, L.A., and Yokel, F.Y., 1981. Energy Measurement in the Standard Penetration Test. National Bureau of Standards Building Science Series 135, 99 pp.

Kraemer, S., 1996. Geotechnical Earthquake Engineering. Prentice Hall.

Kulhawy, F.H. and Mayne, P., 1990. Manual on Estimating Soil Properties for Foundation Design. EPPRI.

Kulhawy, F.H. and Trautmann, C.H., 1996. Estimation of In Situ Test Uncertainty. Uncertainty in the Geologic Environment: From Theory to Practice, ASCE, Vol. 1, pp. 269-286.

Kulhawy, F.H., Jackson, C., and Mayne, P.W., 1989. First-Order Estimation of K₀ in Sands and Clays.

Foundation Engineering: Current Principles and Practices, ASCE, pp. 121-134.

Kuwambara, F. and Tanaka, M., 1998. Statistical Analysis of Shaft Friction of Vertically Loaded Bored Piles. Proceedings of the 3rd International Geotechnical Seminar on Bored and Angered Piles, pp. 293-297.

Lake, L.M., 1974. Discussion on Session 1, Settlement of Structures, BGS, p. 663.

Lamb, R., 1997. SPT Energy Measurements with the PDA. Proceedings of the 45th Annual Geotechnical Engineering Conference, University of Minnesota, St. Paul, MN.

Lee, S.H.H., 1992. Analysis of the Multicollinearity of Regression Equations of Shear Wave Velocity.

Soils and Foundations, Vol. 32, No. 1, pp. 205-214.

Liao, S.S.C. and Whitman, R.V., 1986. Overburden Correction Factors of SPT in Sand. Journal of Geotechnical Engineering, ASCE, Vol. 112, No. 3, pp. 373-377.

Liebich, B., 2005. Standard Penetration Test Energy Testing and Hammer Efficiency Measurements.

California Department of Transportation Geotechnical Manual.

Lutenegger, A.J., 2008. The Standard Penetration Test - More Than Just a One Number Test.

Proceedings of the 3rd International Symposium on Site Characterization, pp. 481-485. Lutenegger, A.J., 2009. Estimating Shaft Resistance of Driven Piles from SPT-Torque Tests. Contemporary Topics in In Situ Testing, Analysis, and Reliability of Foundations, ASCE GSP 186, pp. 9-17.

Lutenegger, A.J. and Adams, M.T., 1998. Bearing Capacity of Footings on Compacted Sand. Proceedings of the 4th International Conference on Case Histories in Geotechnical Engineering, pp. 1216-1224.

Lutenegger, A.J. and Adams, M.T., 2003. Characteristic Load-Displacement Curves of Shallow Foundations. Proceedings of the International Conference on Shallow Foundations, Paris, France, Vol. 2, pp. 381-393.

Lutenegger, A.J. and Kelley, S.P., 1998. Standard Penetration Tests with Torque Measurement.

Proceedings of the International Symposium on Site Characterization, Vol. 2, pp. 939-945. Marcuson, W.F., 1978. Determination of In Situ Density of Sands. ASTM Special Technical Publication 654, pp. 318-340.

Marcuson, W.F. and Bieganousky, W. A., 1977a. Laboratory Standard Penetration Tests on Fine Sands.

Journal of the Geotechnical Engineering Division, ASCE, Vol. 103, No. GT6, pp. 565-588. Marcuson, W.F. and Bieganousky, W.A., 1977b. SPT and Relative Density in Coarse Sands .Journal of the Geotechnical Engineering Division, ASCE, Vol. 103, No. GT11, pp. 1295-1309. Martin, R.E., 1977. Estimating Foundation Settlements in Residual Soils. Journal of the Geotechnical Engineering Division, ASCE, Vol. 103, No. GT3, pp. 197-212.

Martin, R.E., 1987. Settlement of Residual Soils. Foundations and Excavation in Decomposed Rocks of the Piedmont Province, ASCE, pp. 1-14.

Matsui, T., 1993. Case Studies on Cast-In-Place Bored Piles and Some Considerations for Design. Proceedings of the 2nd International Geotechnical Seminar on Bored and Angered Piles, pp. 77-101.

Matsumoto, K. and Matsubara, M., 1982. Effects of Rod Diameter in the Standard Penetration Test. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 107-112.

Matsumoto, T., Sekiguchi, El., Yoshida, H., and Kita, K., 1992. Significance of Two-Point Strain Measurement in SPT. Soils and Foundations, Vol. 32, No. 2, pp. 67-82.

Matsumoto, T., Phan, L., Oshima, A., and Shimono, S., 2015. Measurements of Driving Energy in SPT and Various Dynamic Cone Penetration Tests. Soils and Foundations, Vol. 55, No. 1,

pp. 201-212.

Mayne, P.W., 1995. Profiling Yield Stress in Clays by In Situ Tests. Transportation Research Record No. 1479, pp. 43-50.

Mayne, P.W. and Kemper, J.B., 1988. Profiling OCR in Stiff Clays by CPT and SPT. Geotechnical Testing Journal, ASTM, Vol. 11, No. 2, pp. 139-147.

Mayne, P.W. and Kulhawy, F.H., 1982. K₍₎- OCR Relationships in Soil .Journal of the Geotechnical Engineering Division, ASCE, Vol. 108, No. GT6, pp. 851-872.

Meyerhof, G.G., 1956. Penetration Tests and Bearing Capacity of Cohesionless Soils .Journal of the Soil Mechanics Division, ASCE, Vol. 82, SMI, pp. 1-12.

Meyerhof, G.G., 1976. Bearing Capacity and Settlement of Pile Foundations. Journal of the Geotechnical Engineering Division, ASCE, Vol. 102, No. GT3, pp. 197-228.

Morgano, C.M. and Liang, R., 1992. Energy Transfer in SPT - Rod Length Effect. Application of Stress-Wave Theory to Piles, pp. 121-127.

Muromachi, T., Aguro I., and Miyashita, T., 1974. Penetration Testing in Japan. Proceedings of the European Symposium on Penetration Testing, Vol. 1, pp. 193-200.

Nassaji, F. and Kalantari, B., 2011. SPT Capability to Estimate Undrained Shear Strength of Fine- Grained Soils of Tehran, Iran. Electronic Journal of Geotechnical Engineering, Vol. 16, pp. 1229-1238.

National Highway Institute (NHI), 2002. Course 132031 Subsurface Investigations - Geotechnical Site Characterization Reference Manual; Publication No. FHWA NHI-01-031.

Nayak, N.V., 1979. Use of the Pressuremeter in Geotechnical Design Practice. Proceedings of the International Symposium on In Situ Testing of Soils and Rocks and Performance of Structures, Roorkee pp. 432-436.

Nevels, J. and Laguros, J., 1993. Correlation of Engineering Properties of the Hennessey Formation Clays and Shales. Proceedings of the International Symposium on Geotechnical Properties of Hard Soils and Soft Rock, Vol. 1, pp. 215-221.

Nixon, I.K., 1982. Standard Penetration Test: State of Art Report. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 3-24.

Odebrecht, E., Schnaid, F., Rocha, M., and Bernardes, G., 2004. Energy Measurements for Standard Penetration Tests and the Effects of the Length of Rods. Proceedings of the 2nd International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 1, pp. 351-358.

Ohsaki, Y. and Iwasaki, R., 1973. On the Dynamic Shear Moduli and Poisson’s Ratio of Soil Deposits. Soils and Foundations, Vol. 13, No. 4, pp. 61-73.

Ohta, Y. and Goto, N., 1978. Empirical Shear Wave Velocity Equations in Terms of Characteristic Soil Indexes. Earthquake Engineering and Structural Dynamics, Vol. 6, pp. 167-187.

Ohya, S., Imai, T., and Nagura, M., 1982. Relationships between N-Value by SPT and LLT Measurement Results. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. l,pp. 125-130.

Oskorouchi, A.M. and Mehdibeigi, A., 1988. Effect of Overburden Pressure on SPT N-Values in Cohesive Soils of North Iran. Proceedings of the 1st International Symposium on Penetration Testing, Vol. 1, pp. 363-367.

Palmer, D.J. and Smart, J.G., 1957. Some Observations on the Standard Penetration Test and a Correlation of the Test with a New Penetrometer. Proceedings of the 4th International Conference on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 231-236.

Papadopoulos, B.P., 1992. Settlement of Shallow Foundations on Cohesionless Soils. Journal of Geotechnical Engineering, ASCE, Vol. 118, No. 3, pp. 377-393.

Parsons, J.D., 1966. discussion of Standard Penetration Test: Its Uses an Abuses .Journal of the Soil Mechanics and Foundation Division, ASCE, Vol. 92, No. SM3, pp. 103-105.

Parry, R.H.G., 1977. Estimating Bearing Capacity in Sand from SPT Values. Journal of the Geotechnical Engineering Division, ASCE, Vol. 103, No. GT9, pp. 1112-1116.

Peck, R.B., Hanson, W.E., and Thornburn, T.H., 1953. Foundation Engineering. John Wiley 5c Sons Inc., New York.

Peck, R.B., Hansen, W.E., and Thornburn, T.H., 1974. Foundation Engineering. John Wiley 6c Sons, Inc., New York.

Pedrini, R. A. A. and Giacheti,H.L., 2013. The Seismic SPT to Determine the Maximum Shear Modulus. Proceedings of the 4th International Geophysical and Geotechnical Site Characterization Conference, ISC-4, pp. 337-342.

Pedrini, R.A.A., Rocha, B., and Giacheti, H.L., 2018. The Up-Hole Seismic Test Together with the SPT: Description of the System and Method. Soils and Rocks, Sao Paulo, Vol. 41, No. 2, pp. 133-148.

Peixoto, A., Carvalho, D., and Giacheti, H., 2004. SPT-T: Test Procedure and Applications. Proceedings of the 2nd International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 1, pp. 359-366.

Pinto, C. and Abramento, M., 1997. Pressuremeter Tests on Gneissic Residual Soil in Sao Paulo, Brazil. Proceedings of the 14th International Conference on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 175-176.

Pitilakis, K., Lontzetidid, K., Raptakis, D., and Tika, T., 1998. Geotechnical and Seismic Survey for Site Characterization. Proceedings of the 1st International Conference on Site Characterization, Vol. 2, pp. 1339-1344.

Pitilakis, K., Raptakis, D., Lontzetidis, K., Tika-Vassilikou, T., and Jongmans, D. 1999. Geotechnical and Geophysical Descriptions of Euro-Seistests Using Field and Laboratory Tests and Moderate Strong Ground Motions .Journal of Earthquake Engineering, Vol. 3, No. 3, pp. 381-409.

Plytas, C., Baltzoglou, A., Chlimintzas, G., Anagnostopoulos, G., Kozompolis, A. and Koutalia, C., 2011. Empirical determination of the undrained shear strength of very stiff to (very) hard cohesive soils from SPT tests. Proceedings of the 15the European Conference on Soil Mechanics and Foundation Engineering, pp. 61-66.

Poulos, H., 1989. Pile Behaviour - Theory and Applications. Geotechnique, Vol. 39, No. 3, pp. 365-415.

Ranzine, S., 1988. SPTF Technical Note. Solos e Rochas, Vol. 11, pp. 29-30.

Raptakis, D., Anastasiadis, A., Pitilakis, K., and Lontzetidis, K., 1994. Shear Wave Velocity and Damping of Greek Natural Soils. Proceedings of the 10th European Conference on Earthquake Engineering.

Reese, L.C., Touma, F.T., and O’Neill, M., 1976. Behavior of Drilled Piers under Axial Loading. Journal of the Geotechnical Engineering Division, ASCE, Vol. 102, No. GT5, pp. 493-510.

Riggs, C.O., Schmidt, N.O., and Rassieur, C.L., 1983. Reproducible SPT Hammer Impact Force with an Automatic Free Fall SPT Hammer System. Geotechnical Testing Journal, ASTM, Vol. 6, No. 4, pp. 165-172.

Riggs, C.O., Mathes, G.M., and Rassieur, C.L., 1984. A Field Study of an Automatic SPT Hammer System. Geotechnical Testing Journal, ASTM, Vol. 7, No. 3, pp. 158-163.

Rocha, B., Pedrini, R., and Giachetti, H., 2015. G₀/N Ratio in Tropical Soils from Brazil. Electronic Journal of Geotechnical Engineering, Vol. 20, No. 7, pp. 1915-1933.

Robert, Y., 1997. A Few Comments on Pile Design. Canadian Geotechnical Journal, Vol. 34, pp. 560-567.

Robertson, P.K., Campanella, R.G., and Wightman, A., 1983. SPT-CPT Correlations .Journal of the Geotechnical Engineering Division, ASCE, Vol. 109, No. 11, pp. 1454-1459.

Robertson, P.K., Woeller, D.J., and Addo, K.O., 1992. Standard Penetration Test Energy Measurements Using a System Based on the Personal Computer. Canadian Geotechnical Journal, Vol. 29, No. 4, pp. 551-557.

Rocha Filho, P., Antunes, F., and Falcao, M.F.Q., 1985. Qualitative Influence of the Weathering Degree upon the Mechanical Properties of Young Gneiss Residual Soil. Proceedings of the 1st International Conference on Geomechanics in Tropical Lateritic and Saprolitic Soils, Vol. 1, pp. 281-294.

Rogers, J., 2006. Subsurface Exploration Using the Standard Penetration Test and the Cone Penetration Test. Environmental & Engineering Geoscience, Vol. 12, No. 2, pp. 161-179.

Rollins, K.M., Evans, M.D., Diehl, N.B., and Daily, W.D. Ill, 1998. Shear Modulus and Damping Relationships for Gravels. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 124, No. 5, pp. 396-405.

Ruge, J., Mendoza, C., Colmenares, J., Cunha, R., and Otalvaro, I., 2018. Analysis of the Undrained Shear Strength through the Standard Penetration Test with Torque (SPT-T). International Journal of GEOMATE, Vol. 14, No. 41, pp. 102-110.

Saiki, K., 1983. Methods of Analysis for Correcting the Standard Penetration Resistance Measured in Normally Consolidated Clays. Recent Developments in Laboratory and Field Tests and Analysis of Geotechnical Problems, pp. 375-380.

Sambhandharaksa, S. and Pitupakorn, W., 1985. Predictions of Prestressed Concrete Pile Capacity in Bangkok Stiff Clay and Clayey Sand. Proceedings of the 8th Southeast Asian Geotechnical Conference, pp. 3.58-3.65.

Sanglerat, G., 1972. The Penetrometer and Soil Exploration. Elsevier, Amsterdam, 464 pp.

Sanglerat, G. and Sanglerat, T.R., 1982. Pitfalls of the SPT. Proceedings of the 2nd European Symposium Penetration Testing, Vol. 1, pp. 143-145.

Sarac, D. and Popovic, M., 1982. Penetration Tests for Determination of Characteristics of Flood Dike Materials. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 147-152.

Schmertmann, J.H., 1978. Use of the SPT to Measure Dynamic Soil Properties? - Yes, But...! ASTM Special Technical Publication 654, pp. 341-355.

Schmertmann, J.H., 1979. Statics of SPT. Journal of the Geotechnical Division, ASCE, Vol. 105, No. GT5, pp. 655-670.

Schmertmann, J.H., 1984. Discussion of Reproducible SPT Hammer Force with an Automatic Free Fall SPT Hammer System. Geotechnical Testing Journal, ASTM, Vol. 7, No. 3, pp. 167-168.

Schmertmann, J.H. and Palacios, A., 1979. Energy Dynamics of SPT. Journal of the Geotechnical Engineering Division, ASCE, Vol. 105, No. GT8, pp. 909-926.

Schnaid, F., Odebrecht, E., Rocha, M, and Bernardes, G., 2009. Prediction of Soil Properties from the Concepts of Energy Transfer in Dynamic Penetration Tests. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 135, No. 8, pp. 1092-1100.

Schultze, E. and Melzer, K.J., 1965. The Determination of the Density of Modulus of Compressibility of Non-Cohesive Soils by Soundings. Proceedings of the 6th International Conference on Soil Mechanics and Foundation Engineering, Vol. 1, pp. 354-358.

Seed, H.B., 1976. Evaluation of Soil Liquefaction Effects on Level Ground during Earthquakes. ASCE Specialty Session, Liquefaction Problems in Geotechnical Engineering, ASCE.

Seed, H.B. and De Alba, P., 1986. Use of SPT and CPT Tests for Evaluating the Liquefaction Resistance of Sands. Use of In Situ Tests in Geotechnical Engineering, ASCE, pp. 281-302.

Seed, H.B., Idriss, I.M., and Arango, I., 1983. Evaluation of Liquefaction Potential Using Field Performance Data. Journal of the Geotechnical Engineering Division, ASCE, Vol. 109. No. GT3, pp. 458-482.

Seed, H.B., Tokimatsu, K., Hardner, L.F., and Chung, R.M., 1985. Influence of SPT Procedures in Soil Liquefaction Resistance Evaluations. Journal of Geotechnical Engineering, ASCE, Vol. Ill, No. GT12, pp. 1425-1445.

Seed, R.B., Harder, L.F. Jr., and Youd, T.L., 1988. Effects of Borehole Fluid on Standard Penetration Test Results. Geotechnical Testing Journal, ASTM, Vol. 11, No. 4, pp. 248-256.

Serajuddin, M. and Chowdhury, M., 1996. Correlation between Standard Penetration Resistance and Unconfined Compression Strength of Bangladesh Cohesive Deposits. Journal of Civil Engineering, The Institution of Engineers, Bangladesh, Vol. CE24, No. 1, pp. 69-83.

Shi-Ming, H., 1982. Experience on a Standard Penetration Test. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 61-66.

Shioi, Y. and Fukui, J., 1982. Application of N-Value to Design of Foundations in Japan. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 159-164.

Sivrikaya, O. and Togrol. E., 2002. Relations between SPT-N and q_u. Proceedings of the Sth International Congress on Advances in Civil Engineering, Istanbul, pp. 943-952.

Sivrikaya, O. and Togrol. E., 2006. Determination of Undrained Strength of Fine-Grained Soils by Means of SPT and Its Application in Turkey. Engineering Geology, Vol. 86, pp. 52-69.

Skempton, A.W., 1986. Standard Penetration Test Procedures and the Effects in Sands of Overburden Pressure, Relative Density, Particle Size, Aging Overconsolidation. Geotechnique, Vol. 36, No. 3, pp. 425-447.

Sowers, G., 1979. Introductory Soil Mechanics and Foundations. Macmillan, New York, 621 pp.

Sowers, G.B. and Sowers, G.F., 1961. Introductory Soil Mechanics and Foundations. The Macmillan Co., 2nd Edition, New York, 386 pp.

Spangler, M.G., 1960. Soil Engineering. International Textbook Co., 2nd Edition, Scranton, PA, 483 pp.

Stamatopoulos, A.C. and Kotzias, P.C., 1974. The Use of the Standard Penetration Test in Classifying Rocks. Proceedings of the 3rd International Congress of the International Society for Rock Mechanics, p. 85.

Stamatopoulos, A.C. and Kotzias, P.C., 1993. Refusal to the SPT and Penetrability. Geotechnical Engineering of Hard Soils - Soft Rock, Vol. 1, pp. 301-306.

Stark, T., Long, J., and Assem, P., 2013. Improvement for Determining the Axial Capacity of Drilled Shafts in Illinois. Research Report No. FHWA-ICT-13-017, Illinois Center for Transportation.

Stark, T., Long, J., Baghdady, A., and Osouli, A., 2017. Modified Standard Penetration Test-Based Drilled Shaft Design Method for Weak Rocks. Research Report No. FHWA-ICT-17-018, Illinois Center for Transportation.

Stroud, M.A., 1974. The Standard Penetration Test in Insensitive Clays and Soft Rocks. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 2, pp. 367-375.

Stroud, M.A., 1989. The Standard Penetration Test - Its Application and Interpretation. Proceedings of the Conference on Penetration Testing in the U.K., pp. 29-46.

Stroud, M.A. and Butler, F.G., 1975. The Standard Penetration Test and the Engineering Properties of Glacial Materials. Proceedings of the Symposium on Engineering Behavior of Glacial Materials, pp. 117-128.

Suzuki, Y., Goto, S., Hatanaka, M., and Tokimatsu, K., 1993. Correlation between Strengths and Penetration Resistances in Gravelly Soils. Soils and Foundations, Vol. 33, No. 1, pp. 92-101.

Sy, A. and Campanella, R.G., 1993. Dynamic Performance of the Becker Hammer Drill and Penetration Test. Canadian Geotechnical Journal, Vol. 30, No. 4, pp. 607-619.

Sy, A. and Campanella, R.G., 1994. Becker and Standard Penetration Tests (BPT-SPT) Correlations with Consideration of Casing Friction. Canadian Geotechnical Journal, Vol. 31, No. 3, pp. 343-356.

Sykora, D.W. and Stokoe, K.H., 1983. Correlations of In Situ Measurements in Sands with Shear Wave Velocity. Geotechnical Engineering Report GR83-33. University of Texas at Austin, Austin, TX.

Sykora, D. and Koester, J., 1988. Correlations between Dynamic Shear Resistance and Standard Penetration Resistance in Soils. Earthquake Engineering and Soil Mechanics II, ASCE, pp. 389-404.

Takesue, K., Sasao, H., and Makihara, Y., 1996. Cone Penetration Testing in Volcanic Soil Deposits. Advances in Site Investigation Practice, Institution of Civil Engineers, Thomas Telford, London, England, pp. 452-463

Tavares, A.X., 1988. Bearing Capacity of Footings on Guabirotuba Clay Based on SPT N-Values. Proceedings of the 1st International Symposium on Penetration Testing, Vol. 1, pp. 375-379.

Terzagi, K. and Peck, R.B., 1948. Soil Mechanics in Engineering Practice. John Wiley.

Terzaghi, K. and Peck, R., 1967. Soil Mechanics in Engineering Practice. 2nd Edition. John Wiley &c Sons, New York, 729 pp.

Terzaghi, K., Peck, R.B., and Mezri, G., 1996. Soil Mechanics in Engineering Practice. John Wiley & Sons, New York.

Toh, C.t., Ting, W.H., and Ooi,T.A., 1987. Allowable Bearing Pressure of the Kenney Hill Formation. Proceedings of the 9th Southeast Asian Geotechnical Conference, pp. 6/55-6/66.

Tokimatsu, K., 1988. Penetration Tests for Dynamic Problems. Proceedings of the International Symposium on Penetration Testing, Vol. 1, pp. 117-136.

Tokimatsu, K. and Yoshimi, Y., 1983. Empirical Correlation of Soil Liquefaction Based on SPT N-Value and Fines Content. Soils and Foundations, Vol. 23, No. 4, pp. 56-74.

Toledo, R.D., 1986. Field Study of the Stiffness of a Gneissic Residual Soil Using Pressuremeter and Instrumented Pile Load Test. MS Thesis, Civil Engineering Department, Pontifical Catholic University, Rio de Janeiro.

Towhata, I. and Ronteix, S., 1988. Probabilistic Prediction of Shear Wave Velocity from SPT Blowcounts and Its Application to Seismic Microzonation. Proceedings of the Symposium on Geotechnical Aspects of Restoration and Maintenance of Infra-Structures and Historical Monuments, pp. 423-439.

Tsiambaos, G. and Sabtakakis, N., 2011. Empirical Estimation of Shear Wave Velocity from In Situ Tests on Soil Formations in Greece. Bulletin of Engineering Geology and the Environment, Vol. 70, pp. 291-297.

Tsuchiya, H. and Toyooka, Y. 1982. Comparison between N-Value and Pressuremeter Parameters. Proceedings of the 2nd European Symposium on Penetration Testing, Vol. 1, pp. 169-174.

Uma Maheswari, R., Boominathan, A., and Dodagoudar, G., 2010. Use of Surface Waves in Statistical Correlations of Shear Wave Velocity and Penetration Resistance of Chennai Soils. Geotechnical and Geological Engineering, Vol. 28, pp. 119-137.

Valiquette, M., Robinson, B., and Borden, R., 2010. Energy Efficiency and Rod Length Effects in SPT Hammers. Proceedings of the 89th Annual Meeting of the Transportation Research Board, Washington, DC.

Vallee, R.P. and Skryness, R.S., 1979. Sampling and In-Situ Density of a Saturated Gravel Deposit. Geotechnical Testing Journal, ASTM, Vol. 2, No. 3, pp. 136-142.

Van der Graaf, H.J. and Van den Heuvel, M.H.J.P., 1992. Determination of the Penetration Energy in the Standard Penetration Test. Application of Stress-Wave Theory to Piles, pp. 253-257.

Veijayaratnam, M., Poh, K., and Tan, S., 1993. Seismic Velocities in Singapore Soils and Some Geotechnical Applications. Proceedings of the 11th Southeast Asian Geotechnical Conference, pp. 813-818.

Viana da Fonseca, A., Fernandes, M., and Cardoso, A., 1998. Characterization of a Saprolitic Soil from Porto Granite Using In Situ Testing. Proceedings of the 1st International Conference on Site Characterization, Vol. 2, pp. 1381-1387.

Viswanath, M. and Mayne, P., 2013. Direct SPT Method for Footing Response in Sands Using a Database Approach. Proceedings of the 4th International Symposium on Geotechnical and Geophysical Site Characterization, Vol. 2, pp. 1131-1136.

Wada, A., 2003. Development Mechanism of Pile Skin Friction. Proceedings of the BGA International Conference on Foundations, pp. 921-929.

Webb, D.L., 1969. Settlement of Structures on Deep Alluvial Sandy Sediments in Durban, South Africa. Proceedings of the Conference on In Situ Investigations in Soils and Rocks, BGS, pp. 181-187.

White, F., Ingram, P., Nicholson, D., Stroud, M. and Betru, M., 2019. An update of the SPT-cu relationship proposed by M. Stroud in 1974. Proceedings of the 17^th European Conference on Soil Mechanics and Foundation Engineering, 8 pp.

Whited, G.C. and Edil, T.B., 1986. Influence of Borehole Stabilization Techniques on Standard Penetration Test Results. Geotechnical Testing Journal, ASTM, Vol. 9, No. 5, pp. 180-188.

Wightman, A., Yan, L., and Diggle, D.A., 1993. Improvements to the Becker Penetration Test for Estimate of SPT Resistance in Gravelly Soils. Proceedings of the 46th Canadian Geotechnical Conference, pp. 379-388.

Winter, E., Nordmark, T.S., and Burns, T., 1989. Skin Friction Load Tests for Caissons in Residual Soils. Foundation Engineering: Current Principles and Practices, ASCE, Vol. 2, pp. 1070-1075.

Winter, C., Wagner, A., and Komurka, V., 2005. Investigation of Standard Penetration Torque Testing (SPT-T) to Predict Pile Performance. Report No. 0092-04-09, Wisconsin Highway Research Program.

Wrench, B.P. and Nowatzki, E.A., 1986. A Relationship between Deformation Modulus and SPT N for Gravels. Use of In Situ Tests in Geotechnical Engineering, ASCE, pp. 1163-1177.

Wroth, C.P., 1984. The Interpretation of In Situ Tests. Geotechnique, Vol. 34, No. 4, pp. 449-489.

Wroth, C.P., Randolph, M.F., Houslby, G. and Fahey, M., 1979. A Review of Engineering Properties of Soils, with Particular Reference to the Shear Modulus. CUED/D Soils TR75, Cambridge University Engineering Department.

Yagiz, S., Akyol, E., and Sen, G., 2008. Relationship between the Standard Penetration Test and the Pressuremeter Test on Sandy Silty Clays: A Case Study from Denizli. Bulletin of Engineering Geology and Environment, Vol. 67, pp. 405-410.

Yokel, F.Y., 1982. Energy Transfer in Standard Penetration Test. Journal of the Geotechnical Engineering Division, ASCE, Vol. 108, No. GT9, pp. 1197-1202.

Yoshida, Y., Ikemi, M., and Kokusho, T., 1988. Empirical Formulas of SPT Blow-Counts for Gravelly Soils. Proceedings of the 1st International Symposium on Penetration Testing, Vol. 1, pp. 381-387.