JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.1 P.15-23

Numerical modeling of an advancing hydraulically-driven pile in sand

Author(s): Meen-wah Gui
Affiliation(s): Department of Civil Engineering, National Taipei University of Technology, Taipei 106
Corresponding email(s): mwgui@ntut.edu.tw
Key Words: Hydraulic pile, Tip resistance, Sand, Double yield (DY) model, Pile penetration, Grid re-meshing

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Abstract: The penetration of a model pile through sand was investigated via a numerical analysis. Data from nine triaxial compression tests on dense specimens at different stress levels was generalized and used to create an empirical non-linear plastic hardening stress-strain relation for use in the analysis. As the computer program used is capable of large displacement analyses in radial symmetry, we expected that the analysis would easily reproduce the tip resistance penetration profile of the model pile in sand of known density and stress. However, initial attempts led to over-prediction. Successful analyses required both successive reformations of the mesh and the complete elimination of the dilatant peak in soil strength, which is naturally eliminated under large confining stress directly beneath the advancing tip, and that soil in the far-field had strained insufficiently to reach peak strength. Thus, the soil around the shaft must have been sheared to a critical state as it flowed past the tip. The hypothesis that the resistance to displacement piles in sand is mainly a function of the deformability of the sand was again proven, and the use of peak strength in the traditional bearing capacity formulae was found to be inappropriate. Independent investigation in this direction is needed to quantify the hypothesis.

Reference

[1]Bolton, M.D., 1986. The strength and dilatancy of sands. Geotechnique, 36(1):65-78.

[2]Bolton, M.D., Gui, M.W., Garnier, J., Corte, J.F., Bagge, G., Laue, J., Renzi, R., 1999. Centrifuge cone penetration test in sand. Geotechnique, 49(3):543-552.

[3]Collins, I.F., Pender, M.J., Wang, Y., 1992. Cavity expansion in sands under drained loading conditions. International Journal for Numerical and Analytical Methods in Geomechanics, 16(1):3-23.

[4]Graham, J., Hovan, J.M., 1986. Stress characteristics for bearing capacity in sand using a critical state model. Canadian Geotechnical Journal, 23(2):195-202.

[5]Gui, M.W., Muhunthan, B., 2006. Bearing capacity of foundations on sand using the method of slip line. Journal of Marine Science and Technology, 14(1):1-14.

[6]Gui, M.W., Jeng, D.S., 2009. Application of cavity expansion theory in predicting centrifuge cone penetration resistance. The Open Civil Engineering Journal, 3(1):1-6.

[7]Itasca Consulting Group, Inc., 2005. Fast Lagrangian Analysis of Continua Version 5.0 User Manual. Minneapolis, USA.

[8]Kuwajima, K., Hyodo, M., Hyde, A.F.L., 2009. Pile bearing capacity factors and soil crushability. Journal of Geotechnical and Geoenvironmental Engineering, 135(7):901-913.

[9]Lee, S.Y., 1990. Centrifuge Modelling of Cone Penetration Test in Cohesionless Soil. PhD Thesis, Cambridge University, UK.

[10]Luong, M.P., Touati, A., 1983. Sols grenus sous fortes contraintes. Revue Francaix de Geotechnique, 23:51-63 (in French).

[11]Mair, R.J., Wood, D.M., 1987. Pressuremeter Testing: Methods and Interpretation. CIRIA Ground Engineering Report, In-situ Testing, Butterworths, London.

[12]Randolph, M.F., Dolwin, J., Beck, R., 1994. Design of driven piles in sand. Geotechnique, 44(3):427-448.

[13]Salencon, J., 1969. Contractionquasi-statique d’une cavité a symétrie sphérique ou cylindrique dans un milieu elastoplastique. Annales des Ponts et Chaussées, 4:231-236 (in French).

[14]Salgado, R., Lyamin, A.V., Sloan, S.W., Yu, H.S., 2004. Two and three dimensional bearing capacity of foundations in clay. Geotechnique, 54(5):297-306.

[15]Schofield, A.N., 2005. Disturbed Soil Properties and Geotechnical Design. Thomas Telford, London, p.142.

[16]Shepard, D., 1968. A Two-Dimensional Interpolation Function for Irregularly-Spaced Data. Proceedings of the ACM National Conference, p.517-524.

[17]Tatsuoka, F., Sakamoto, M., Kawamura, T., Fukushima, S., 1986. Strength and deformation characteristics of sand in plane strain compression at extremely low pressures. Soil and Foundations, 26(1):65-84.

[18]Terzaghi, K., Peck, R.B., 1948. Soil Mechanics in Engineering Practice. John Wiley, New York.

[19]van den Berg, P., 1994. Analysis of Soil Penetration. PhD Thesis, Delft University of Technology, Delft, the Netherlands.

[20]Yasufuku, N., Hyde, A.F.L., 1995. Pile end-bearing capacity in crushable sands. Geotechnique, 45(4):663-676.

[21]Yu, H.S., Mitchell, J.K., 1998. Analysis of cone resistance: Review of methods. Journal of Geotechnical and Geoenvironmental Engineering, 124(2):140-149.

[22]Zhou, J., Deng, Y.B., Ye, J.Z., Jia, M.C., 2009. Experimental and numerical analysis of jacked piles during installation in sand. Chinese Journal of Geotechnical Engineering, 31(4):501-507 (in Chinese).

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