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A Study on the Behaviour of Single Piles and Pile Groups in Consolidating Ground from Coupled Consolidation Analyses
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 Title & Authors
A Study on the Behaviour of Single Piles and Pile Groups in Consolidating Ground from Coupled Consolidation Analyses
Kim, Sung-Hee; Jeon, Young-Jin; Lee, Cheol-Ju;
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In the present work, a number of advanced three-dimensional (3D) parametric finite element numerical analyses have been conducted to study the behaviour of single piles and pile groups in consolidating ground from coupled consolidation analyses. Single piles, and piles inside groups with a spacing of 2.5D were considered, where D is the pile diameter. It has been found that dragload and downdrag on the piles developed rather quickly at the early stage of consolidation. However, when the degree of consolidation was more than 50~75%, only little increases of dragload and downdrag were induced on the pile. Negative Skin Friction (NSF) on the pile in the fill layer was mobilised quickly and remained constant throughout further consolidation. The development of NSF is influenced both by the relative shear displacements at the pile-soil interface and the vertical effective soil stresses during consolidation. The former governed the early stage of consolidation and the latter affected the later stage of consolidation. The vertical effective soil stresses adjacent to the piles were reduced due to the shear stress transfer at the pile-soil interface, in particular for piles inside the pile groups. The range of NSF influence zone concerning the reductions of the effective vertical soil stresses was about 20D measured from the piles in the horizontal direction. On the contrary, the effective horizontal soil stresses acting on the piles were similar to those at the far field.
Coupled analysis;Negative skin friction;Numerical modelling and analysis;Piles;Pile groups;
 Cited by
Brinkgreve, R. B. J., Kumarswamy, S. and Swolfs, W. M. (2015), Reference manual, Plaxis 3D 2015 user's manual (Edited by Brinkgreve, R. B. J., Kumarswamy, S and Swolfs, W. M), pp. 1-284.

Comodromos, E. and Bareka, S. (2005), Evaluation of negative skin friction effects in pile foundations using 3D nonlinear analysis, Computers and Geotechnics, Vol. 32, No. 3, pp. 210-221. crossref(new window)

Jeong, S. S. (1992), Nonlinear three-dimensional analysis of downdrag on pile groups, PhD thesis, Texas A&M University, pp. 1-165.

Jeong, S.S., Ko, J. Y., Lee, C. J. and Kim, J. H. (2014), Response of single piles in marine deposits to negative skin friction from long-term field monitoring, Marine Georesources & Geotechnology, 32, pp. 239-263. crossref(new window)

Lam, S. Y., Ng, C. W. W., Leung, C. F. and Chan, S. H. (2009), Centrifuge and numerical modelling of dragload effects on piles in consolidating ground, Canadian Geotechnical Journal, Vol. 46, No. 1, pp. 10-24. crossref(new window)

Lam, S. Y., Ng, C. W. W. and Poulos, H. G. (2013), Shielding piles from downdrag in consolidating ground, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 139, No. 6, pp. 956-968. crossref(new window)

Lee, C. J. (2001), The influence of negative skin friction on piles and in pile groups, PhD thesis, Cambridge University, pp. 1-R13.

Lee, C. J., Bolton, M. D. and Al-Tabbaa, A. (2002), Numerical modelling of group effects on the distribution of dragloads in piles foundations, Geotechnique, Vol. 52, No. 5, pp. 325-335. crossref(new window)

Lee, C. J. and Ng, C. W. W. (2004), Development of downdrag on piles and pile groups in consolidation soil, Journal of Geo-technical and Geoenvironmental Engineering, ASCE, Vol. 130, No. 9, pp. 905-914. crossref(new window)

Lee, C. J., Lee, J. H. and Jeong, S. S. (2006), The influence of soil slip on negative skin friction in pile groups connected to cap, Geotechnique, Vol. 56, No.1, pp. 53-56. crossref(new window)

Lee, C. J. (2009a), A study of the influence of negative skin friction on single piles from consolidation analyses, Journal of the Korean Geo-Environmental Society, Vol. 10, No. 2, pp. 29-36 (in Korean).

Lee, C. J. (2009b), The Influence of reduction of vertical stress on the behaviour of piles subjected to negative skin friction, Journal of the Korean Society of Civil Engineers, Vol. 29, No. 1C, pp. 33-39 (in Korean).

Leung, C. F., Liao, B. K., Chow, Y. K., Shen, R. F. and Kog, Y. C. (2004), Behavior of pile subject to negative skin friction and axial load, Soils & Foundations, Vol. 44, No. 6, pp. 17-26. crossref(new window)

Leung, C. F. (2009), Negative skin friction on piles, Indian Geotechnical Conference 2009, Guntur, India, pp. 827-836.

Ng, C. W. W., Poulos, H. G., Chan, V. S. H., Lam, S. S. Y. and Chan, G. C. Y. (2008), Effects of tip location and shielding on piles in consolidating ground, Journal of Geotechnical & Geoenvironmental Engineering, ASCE, Vol. 134, No. 9, pp. 1245-1260. crossref(new window)

Phamvan, P. (1989), Negative skin friction on driven piles in Bangkok subsoils, Ph.D Thesis, AIT, Bangkok, Thailand, pp. 1-235.

Zeevaert, L. (1983), Foundation engineering for difficult subsoil conditions, 2nd Edition, Van Nostrand Reinhold Company, pp. 351-395.