A Method for Predicting Pile Capacity Using Cone Penetration Test Data

Document Type : Regular Paper

Authors

1 Graduate student, Dept of Civil Engineering, K N Toosi University of Technology, Tehran, Iran

2 Civil Engineering Department, K.N. Toosi University of Technology

Abstract

The massive construction in poor lands has encouraged engineers to use deep foundations in order to transfer superstructure loads to the subsoil. Since soil excavation, sampling, and laboratory testing as a part of site investigation are relatively difficult, in-situ tests such as cone penetration test (CPT) as a very informative test may be recommended. The CPT has been widely used in engineering as a part of site investigation, and its data has been used to determine the axial capacity of piles. In this paper, the prediction capability of three empirical widely famous old methods used to predict the axial pile capacity based on CPT data is evaluated by using field data obtained from direct field pile loading tests. In this evaluation, the direct pile load test results are used as measured data. Three popular famous statistical evaluation methods namely the best-fitted line, geometric mean, and geometric standard deviation have been used. The evaluation results indicate that generally although predicting methods based on CPT data have been widely used to determine the axial bearing capacity of piles, they need to be upgraded for the economic and relatively accurate design of piles. According to the statistical studies carried out in the current research, among three old empirical methods, although the Nottingham and Schmertmann Method (1975, 1978) (NSM) [7, 8] has the best agreement with test results, it is felt that the method needs to be upgraded. The modification of NSM has been done in the current paper using a comprehensive database.

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References

[1] Eslami, A., Valikhah, F., Veiskarami, M., and Salehi, M. (2017). “CPT-based investigation for pile toe and shaft resistances distribution.” Geotechnical and Geological Engineering Journal, Vol. 35, pp. 2891-2905.
[2] Cai, G., Liu, S., and Puppala, A.J. (2015). “Comparative performance of the international piezocone and China CPT in Jiangsu Quaternary clays of China.” Transportation Geotechnics Journal, Vol. 3, pp.1-14.
[3] Powell, J., Lunne, T. and Frank, R. (2011). “Semi-empirical design for axial pile capacity in clays.” In Proceedings of 15th International Conference on Soil Mechanics and Geotechnical Engineering, pp. 991-994, Istanbul, Balkema, Rotterdam, the Netherlands.
[4] Eslami, A. & Fellenius, B. (1997). “Pile capacity by direct CPT and CPTu methods applied to 102 case histories.” Canadian Geotechnical Journal, Vol. 34, pp.886-904.
[5] Mayne, P. (2007). “Cone penetration testing – a synthesis of highway practice.” NCHRP Synthesis 368, Transportation Research Board, Washington, D.C.
[6] Aoki, N. & Velloso, D. (1975). “An approximate method to estimate the bearing capacity of piles.” In Proceedings of 5th Pan-American Conference of Soil Mechanics and Foundation Engineering, pp. 367-376, Buenos Aires.
[7] Nottingham, L. (1975). “Use of quasi-static friction cone penetrometer data to predict load capacity of displacement piles.” Ph.D. Thesis, University of Florida.
[8] Schmertmann, J. (1978). “Guidelines for cone penetration test, performance and design.” U.S. Department of Transportation, Washington, D.C.
[9] Philipponnat, G. (1980). “Methode pratique de calcul d'un pieu isole a l'aide du penetrometre statique.” Vol. 10, pp.55-64, Revue Française.
[10] Altaee, A., Fellenius, B.H., and Evgin, E. (1992a). “Axial load transfer for piles in sand.” I. Tests on an instrumented precast pile, Canadian Geotechnical Journal, Vol. 29, pp.11–20.
[11] Altaee, A., Evgin, E., and Fellenius, B.H. (1992b). “Axial load transfer for piles in sand.” II. Numerical analysis, Canadian Geotechnical Journal, Vol. 29, pp. 21–30.
[12] Haustorfer, I.J., and Plesiotis, S. (1988). “Instrumented dynamic and static pile load testing at two bridges.” In Proceedings of the 5th Australia –New Zealand Conference on Geomechanics, Prediction versus Performance, pp. 514–420, Sydney, August 22–28.
[13] Avasarala, S.K.V., Davidson, J.L., and McVay, A.M. (1994). “An evaluation of predicted capacity of single piles from SPILE and UNIPILE programs.” In Proceedings of the FHWA International Conference on Design and Construction of Deep Foundations, Vol. 2, pp. 712–723, Orlando, Fla., December 7–9.
[14] Briaud, J.L., Moore, B.H., and Mitchell, G.B. (1989). “Analysis of pile loading tests at Lock and Dam 26.” In ASCE Proceedings of the Foundation Engineering Congress: Current Principles and Practices, Evanston, Ill., Edited by F.H. Kulhawy, American Society of Civil Engineers, Geotechnical Special Publication 22, Vol. 2, pp. 925–942, June 25–29.
[15] Weber, L. (1987). “Efficiency improvement of steel H-bearing piles.” Arbed Research, Final Report 7210.SA/503.
[16] Tumay, M.T., and Fakhroo, M. (1981). “Pile capacity in soft clays using electric QCPT data.” In Proceedings of a Conference on Cone Penetration Testing and Experience, pp. 434–455, St. Louis, Mo., October 26–30.
[17] Campanella, R.G., Robertson, P.K., Davies, M.P., and Sy, A. (1989). “Use of in-situ tests in pile design.” In Proceedings of 12th International Conference on Soil Mechanics and Foundation Engineering (ICSMFE), Vol. 1, pp. 199–203, Rio de Janeiro, August 13–18.
[18] Finno, R.J. (1989). “Subsurface conditions and pile installation data.” In Proceedings of a Symposium on Predicted and Observed Behavior of Piles, Evanston, Ill., American Society of Civil Engineers, Geotechnical Special Publication 23, pp. 1–74, June 30.
[19] Rauser, J. G. (2008). “In-situ and nondestructive test methods applied to the design and construction of pile foundation projects in coastal Louisiana.” LSU Master's Theses.
[20] Van Impe, P.O. (1999). “Consolidation of saturated, highly compressible porous media.” MSc Thesis, Faculty of Engineering, UGent, (in dutch).
[21] Neveles, J.B., and Donald, R.S. (1994). “Comparison of settlement predictions for single piles in sand based on penetration test results.” In Proceedings of Settlement–94, Vertical and Horizontal Deformations of Foundations and Embankments, College Station, American Society of Civil Engineers, Geotechnical Special Publication GSP 40, pp. 1028– 1039, Tex., June 16–18.
[22] Attar, I. and Fakharian, K. (2013). “Influence of soil setup on shaft resistance variations of driven piles: Case study.” International Journal of Civil Engineering, Vol. 11, pp. 112-121.
[23] Axelsson, G. (1998). “Long-term increase in shaft capacity of driven piles in sand.” In Proceedings of Fourth International Conference on Case Histories in Geotechnical Engineering, pp. 301-308, Missouri, March 9-12.
[24] Cai, G., Liu, S. & Du, G. (2009). “Assessment of direct CPT and CPTu methods for predicting the ultimate bearing." Engineering Geology, Vol. 104, pp.211-222.

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History

  • Receive Date: 19 January 2018
  • Revise Date: 29 March 2018
  • Accept Date: 16 April 2018

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