| SENSITIVE BOUNDING SURFACE CONSTITUTIVE MODEL FOR STRUCTURED CLAY |
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학술지명 International Journal for Numerical and Analytical
저자 박동순,Kutter
발표일 2016-10-10
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The main purpose of the paper is to present a relatively simple, yet realistic, constitutive model for simulations of structured sensitive clays. The proposed constitutive model can simulate 1-D and isotropic consolidation, and drained, undrained shear response of sensitive structured clay. The proposed Sensitive Bounding Surface (SBS) model is based on concepts from the Modified Cam Clay (MCC) model (Roscoe and Burland 1968) and Bounding Surface Plasticity (Dafalias and Herrmann 1982), with the addition of a simple degradation law. The key material parameters are M, λ, κ, ν from the MCC framework, h from the bounding surface framework to model a smoothed elasto-plastic transition, and ωv, ωq and Ssr to model softening associated with destructuration. The model has separate parameters to model destructuration caused by volumetric strain and deviatoric strain. The model is capable of modeling unusual behavior of strain softening during 1-D compression (i.e., a reduction of effective stress as void ratio decreases). A good match between test results and the model simulation is demonstrated. |