中文摘要：

为了进一步研究材料的本构模型,并对岩土工程中本构模型的研究提供参考,基于摩尔库仑理论关于材料塑性屈服是因为在某截面上的剪应力超过一定值的假设,进行三维应力状态下塑性屈服准则以及流动法则的推导,得出三向应力状态下的本构模型。利用FLAC3D的二次开发接口,通过Visual Studio2008将推导出的本构模型写成一个动态链接库文件.dll,并导入FLAC3D。结合1个算例将开发出的模型同经典摩尔库仑模型进行比较。研究结果表明：推导出来的广义摩尔库仑模型在应力加载过程中,在三维斜截面上先于经典摩尔库仑模型产生塑性屈服,即剪应力在三维斜截面上超过了屈服极限强度。

英文摘要：

In order to further study the material constitutive model and provide a reference for the study of cons - titutive model of geotechnical engineering, based on the assumption that the material plastical yield in Mohr is caused by excess shear stress, the plastic yield criterion and flow rule in three - dimensional stress state was deduced, and the three -dimensional consititutive model was obtained. Using the interface of secondary development in FLAC3D, the deduced model was written into a file of dynamic link library file through Visual Studio 2008 and was imported into FLAC3D. A numerical example was provided for comparison with the classical Mohr Coulomb model. The results show that the generalized Mohr - Coulomb model derived does generate plastic yield in three - dimension oblique section before classical Mohr - Coulomb model. That means shear stress exceeds the yield limit strength on the three - dimensional oblique section. This article can be provided a reference for the research of secondary development in FLAC3D.