下负荷面剑桥模型在ABAQUS中的开发实现

Numerical implementation for subloading Cam-clay model in ABAQUS

摘要: 利用大型有限元软件ABAQUS所提供的UMAT用户材料子程序接口，针对下负荷面剑桥模型开发了子程序，对超固结土的三轴排水与不排水试验进行了数值模拟，将结果与解析解进行了比较；对同样条件下不同OCR超固结土的三轴排水与不排水试验进行了模拟。结果表明：所开发的子程序具有良好的稳定性和较高的计算精度，能够反映超固结土的应力应变特性（如应变软化），得到比较合理的数值分析结果。

Abstract: The user subroutine UMAT for user-defined material behaviors in commercial FEM code ABAQUS is utilized for subloading Cam-clay model. The drained and undrained triaxial shear tests on heavily overconsolidated soil are simulated using ABAQUS with the proposed UMAT code. The results are compared with the analytical solutions. The drained and undrained triaxial shear tests on overconsolidated soil with different OCRs are also simulated. It has been proved that the calculated results are valid and can reflect the strain softening behaviors of overconsolidated soil.