Elasto-plastic modelling of strain-softening behavior for soil

The modified Tsinghua elasto-plastic constitutive model was developed by adopting a function of plastic work as hardening parameter to Tsinghua original one. The modified model as 12 model parameters which are easy to be determined by conventional triaxial compression and isotropic compression tests. It can be used to describe the strain-hardening and subsequent strain-softening response and to simulate dilatancy very well during a successive shear application. The results of numerical analysis for the relationship of load and displacement of shallow footing on dense sand with the modified model fits the results of hydraulic gradient model tests very well. The results of numerical calculation show in a preliminary way that the modified model developed in this study is effective for simulating the strain-softening boundary-value problems of geotechnical engineering.