一种修正的莫尔-库仑本构模型及其应用

莫尔-库仑本构模型是理想弹塑性的，只考虑了强度随围压的变化，但没有考虑弹性模量随围压和应力水平的变化情况，这不符合地质材料的实际特性.借助于邓肯-张非线性弹性模型对切线模量的处理方法，对M C模型中的弹性模量进行了修正.修正以后，弹性阶段的应力-应变曲线将表现为双曲线.为了将该修正模型写进FLAC3D程序,特编制了前处理程序，并用来对刚性桩的横向承载力进行了数值分析.因为该模型没有对卸载模量重新定义，所以该模型较适合于持续加载的情况.

A modified Mohr-Coulomb constitutive model and its application

Mohr-Coulomb model is a perfect elastoplastic model.It only considers the variation of material strength with lateral compressive stress,while ignoring the variation of elastic modulus with lateral compressive stress and stress level,which doesn't reflect the true characteristic of geological material.The elasticity modulus in Mohr-Coulomb model was modified by employing the processing method of tangential modulus in Duncan-Chang nonlinear model.In the modified model,the stress-strain curve in the elastic phrase behaves as hyperbola.In order to embed the modified model in FLAC~(3D),a preprocessing program was written and was used to analyze the traverse bearing capacity of rigid piles numerically.Because the unloading modulus in the modified model isn't defined renewedly,it only fits the case of persisting loading well.