层状岩体横观各向同性弹塑性模型及数值实现

A transversely isotropic elastoplastic constitutive model for layered rock mass and its implementation

层状岩体在平行和垂直层面的方向上具有不同的强度、变形特性,进行非线性分析时须将层状岩体视为横观各向同性介质。在前人研究的基础上,通过编写UMAT程序将横观各向同性弹塑性本构模型嵌入ABAQUS有限元分析软件,对层状试件进行单轴压缩数值试验与ABAQUS自带M-C模型计算结果进行对比,同时将该模型退化为各向同性模型应用于层状岩体地下工程的计算,计算结果均能验证该模型的有效性和实用性。

With the differences between strength and deformation characteristics of the layered rock mass inparallel and perpendicular directions with respect to the bedding plane,view the layered rock mass as transverselyisotropic medium in nonlinear analysis.On the basis of previous studies,a transversely isotropic elastoplasticconstitutive model is given,and the model is embedded into ABAQUS with the UMAT program.By comparingthe results of uniaxial compression tests of layered specimens with M-C model in ABAQUS and the transverselyisotropic elastoplastic constitutive model to verify the validity and practicability of the model.In addition,themodel degenerates into the isotropic model to calculate the stratified rock in underground engineering,the resultsshow good agreement with the D-P model in ABAQUS,so this model can provide some guidance for studies ofanisotropic properties of engineering research.