软粘土的各向异性和小应变条件下的本构模型(ASM)

A constitutive model for anisotropic and small strain behaviour of soft clay(ASM)

以能量方程为基础推导出各向异性和小应变条件下弹塑性的本构方程 ,并将屈服面与修正剑桥模型和试验测得的屈服面进行了对比 ,表明新的屈服面比修正剑桥模型更接近试验结果。采用从初始应力点到状态边界面的距离为参数的系数来修正硬化准则以模拟土体小应变条件下的应力 应变特征。将新的本构模型编入有限元程序 ,对小应变试验进行了计算分析 ,计算结果表明 。

In this paper a yield surface of anisotropic and small strain constitutive model (ASM) is presented based on energy equation and compared with yield surface of modified Cam Clay Model (MCC),yield surface from testing result. It is clear that the new yield surface is closer to testing result than MCC.A function of distance between initial stress strain point and point at state boundary surface is adopted to simulate stress strain behaviour of soil in condition of small strain.The new constitutive model is compiled into FEM program and calculation result is compared with experiment.It is shown that the model in this paper can better simulate main characteristics of soil than MCC.