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1 2008

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A simple critical state model with small strain nonlinearity for overconsolidated soils

Gryczmański M., Uliniarz R.

Foundations of Civil and Environmental Engineering

2008

No. 12

49-60

The paper presents a reasonably advanced constitutive law for soil - a hybrid of the Modified Cam Clay and the Fahey - Carter models. The Modified Cam Clay model is an isotropic hardening elasto-plastic one originated by Burland (1967) within the critical state soil mechanics. This model is widely applied in today's geotechnical analysis. It realistically describes mechanical soil behaviour in the normal consolidation states. The other one is designed to ensure more adequate soil responses to reloading paths (within the overconsolidation stress subspace), particularly in the range of small strains. The model has been implemented in the FEM computer code Z_SOIL.pc 7.32. To test the influence of the small strain nonlinearity on soil - structure interaction as well as to exhibit the ability of the proposed model to simulate this effect realistically, a comparative study based on the FEM solution has been carried out. As a benchmark, a strip footing founded on a thick homogeneous cohesive soil layer in two different overconsolidation states has been used. The soil response to a load has been simulated assuming two models: original MCC and FC+MCC.