Plastic Limit Analysis of Laterally Loaded Piles and Wells Conductors in Soil Profiles with Crust
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Copyright 2017, Offshore Technology Conference. This paper presents a series of studies in which traditional upper bound plastic limit analysis (PLA) methods are modified to accommodate non-linear strength profiles which correspond to soils with crust. The collapse mechanism presented comprises a surface failure wedge, a flow-around region and a spherical base failure surface. Results are compared to predictions from 3-dimensional finite element analyses for case of a surficial stiff 'crust' overlying a thicker layer of soft soil. An introductory discussion on the origin of such 'crusts' is included. Comparisons are presented in terms of both horizontal bearing capacity and lateral unit bearing capacity profiles, which are depth-dependent. A series of parametric studies is presented in which the effect of pile diameter and soil strength is assessed. The paper presents a simplified practical approach to calculate lateral bearing capacity factors for soils with crust, by modifying an existing solution for linear soil profiles.
author list (cited authors)
Grajales-Saavedra, F. J., Aubeny, C. P., Jeanjean, P., & Drew, D.