利用ABAQUS中的用户自定义材料子程序UMAT开发的三维邓肯-张模型，应力积分算法采用的是基本增量法-In the use of ABAQUS user-defined material subroutine UMAT developed three-dimensional Duncan- model, stress integration algorithm is the basic incremental method

新增的abaqus邓肯张模型，解决了编译错误问题(New abaqus Duncan chang model)