A MODEL FOR SOIL STRUCTURE MOBILITY AND COLLAPSE

Abstract eng:
This paper presents a plastic constitutive model based on the critical state boundary surface theory. The formulation of the yield surface in the Cam Clay model is used as an inner feature cap or small cap to describe the soil structure mobility and collapse. Unlike a traditional yield surface, a stress path can move below, outside or on the small cap to produce plastic strains. The small cap when related to the steady state strength can be used to predict soil structure collapse under both drained and undrained conditions. Excellent agreement between numerical simulations based on this small cap model and actual laboratory measurements verifies that the model can be used to completely describe the complex behavior of sand which includes contraction, dilation, phase change and ultimate failure at the steady state.

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