Elastic-plastic large deformation analysis of soil slopes

Abstract A complete finite-element stress analysis regarding the static response of a homogeneous vertical slope throughout the entire range of loading up to ultimate load is presented. Soil is modelled as a linear elastic-perfectly plastic material with the Drucker-Prager yield condition and its associated flow rule. Emphasis has been put on the effect of large soil deformation on the solutions. It was found that (1) large deformation analysis is required for any progressive failure solutions of slopes; (2) bulging or progressive loss of ground along the vertical cut is the actual mode of failure for a vertical slope; (3) the velocity field near the limit load shows both “discontinuity” and “slip” along a well defined surface which corresponds to a log-spiral shape; and (4) comparison of properly defined limit or collapse load between finite-element solutions and limit analysis solutions shows an excellent agreement.

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