Bearing Response of Skirted Foundation on Nonhomogeneous Soil
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 125, Issue 11
Abstract
Circular skirted offshore foundations on nonhomogeneous soil have been studied numerically, analytically, and physically, with the offshore sediment simulated as a cohesive soil with strength increasing linearly with depth. In the numerical analysis, the h-adaptive FEM is adopted to provide an optimal mesh, in which a strain-superconvergent patch recovery error estimator and mesh refinement with subdivision concept are used. This paper presents two main studies of circular skirted foundations on nonhomogeneous soil, consisting of a bearing-capacity study and a large penetration study. The bearing capacity of the foundations is studied with the degree of nonhomogeneity (kD/suo) of soil up to 30, different skirt roughness and skirt depth up to five times the foundation diameter (i.e., Df/D = 5), using an h-adaptive FEM and extended upper-bound method. The bearing-capacity values and soil flow mechanisms are discussed. In the foundation large penetration study, circular skirted foundations penetrating into normally consolidated and overconsolidated soils are tested physically in the centrifuge and analyzed numerically using the h-adaptive remeshing and interpolation technique with small strain method for soil large deformation analysis. The load-displacement responses from centrifuge test data and finite-element results are compared.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Belytschko, T., and Tabbara, M. (1993). “H-adaptivity finite element methods for dynamic problems, with emphasis on localization.” Int. J. Numer. Methods in Engrg., 36, 4245–4265.
2.
Carter, J. P., and Balaam, N. (1990). AFENA users manual. Geotech. Res. Ctr., University of Sydney, Australia.
3.
Clarke, B. G. (1995). Pressuremeters in geotechnical design. Blackie Academic & Professional, Glasgow, Scotland.
4.
Hu, Y., and Randolph, M. F. (1998a). “A practical numerical approach for large deformation problems in soil.” Int. J. Numer. and Analytical Methods in Geomech., 22, 327–350.
5.
Hu, Y., and Randolph, M. F. (1998b). “Deep penetration of shallow foundations on nonhomogeneous soil.” Soils and Found., Tokyo, 38(1), 241–246.
6.
Hu, Y., and Randolph, M. F. (1998c). “H-adaptive FE analysis of elasto-plastic non-homogeneous soil with large deformation.” Comp. and Geotechnics, 23(1/2), 61–84.
7.
Hu, Y., and Randolph, M. F. (1998d)., “H-adaptive FE analysis of bearing capacity of skirted foundations.” Proc., Int. Conf. on Offshore and Polar Engrg., Vol. 1, 549–556.
8.
Kusakabe, O., Suzuki, H., and Nakase, A. (1986). “An upper bound calculation on bearing capacity of a circular footing on a non-homogeneous clay.” Soils and Found., Tokyo, 114(11), 1277–1291.
9.
Martin, C. M. ( 1994). “Physical and numerical modeling of offshore foundations under combined loads,” PhD thesis, University of Oxford.
10.
Mucke, P., and Whiteman, J. R. (1995). “A posteriori error estimates and adaptivity for finite element solutions in finite elasticity.” Int. J. Numer. Methods in Engrg., 38, 775–795.
11.
Selvadurai, A. P. S., and Boulon, M. J. (1995). Mechanics of geometerial interfaces. Elsevier Science.
12.
Tani, K., and Craig, W. H. (1995). “Bearing capacity of circular foundations on soft clay of strength increasing with depth.” Soils and Found., Tokyo, 35(4), 21–35.
13.
Taylor, R. N. (1995). Centrifuges in modeling: Principles and scale effects. Geotechnical Centrifuge Technology, Blackie Academic & Professional, Glasgow, Scotland.
14.
Tomlinson, M. J. (1986). Foundation design and construction, 5th Ed., Longman, London.
15.
Zienkiewicz, O. C., and Zhu, J. Z. (1993). “The superconvergent patch recovery and a poteriori error estimates. Part 1: The recovery technique.” Int. J. Numer. Engrg., 33, 1331–1364.
Information & Authors
Information
Published In
History
Received: Dec 4, 1998
Published online: Nov 1, 1999
Published in print: Nov 1999
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.