硬化土模型在FLAC3D 中的二次开发

为了对岩土工程领域相关问题提供数值参考，将硬化土模型与强大的非线性计算功能FLAC3D数值分析软件结合。基于拉格朗日有限差分方法，详细地推导了HS模型在FLAC3D中的增量迭代计算格式，并且给出了更新剪切屈服面应力的算法。在FLAC3D提供的二次开发程序接口基础上，利用VC++程序语言实现了计算过程，并将HS模型编译成动态链接库文件进行加载和调用。最后，通过模型计算与试验实测进行比较，验证了二次开发程序的正确性与合理性。

Second development of hardening soil constitutive model based on FLAC3D

If the hardening soil （HS） model can be integrated in the numerical analysis software FLAC3D which has strong nonlinear calculating function, many complex problems in the geotechnical engineering can be settled well. According to the Lagrange finite difference method, the incremental and iterative calculation format of the hardening soil model was derived. The update stress algorithm of shear yield surface was presented. Based on the second development program provided by FLAC3D, VC++ programming language was used to realize the calculation process and the HS model was compiled into dynamic link library files which is loaded and invoked. Finally, the model calculation results were compared with soil measured test results to prove the correctness and reasonableness of the second development program.