层状岩体各向异性弹塑性本构模型的数值实现

The Numerical Implementation of Anisotropic and Elastic-plastic Constitutive Model for Layered Rock Mass

层状岩体具有明显的各向异性变形和强度特性,与均质岩体相比其稳定性及破坏条件表现的极为复杂,因而岩体的各向异性本构关系成为重要的研究课题。在研究层状岩体各向异性等效弹性参数及ABAQUS自带节理材料模型基础上,结合层状岩体弹性参数的各向异性研究,采用FORTRAN语言编制了本构子程序,使层状岩体各向异性弹塑性模型得以数值实现。以某岩质边坡为数值算例,采用多种工况对比分析,验证了层状岩体各向异性弹塑性数值模型的可靠性,从而为实际工程中研究层状岩体的各向异性特征提供数值计算基础。

The anisotropic constitutive relation of layered rock mass is an important research topic with the analysis of its anisotropic deformation and strength characteristics,and the stability and failure conditions of layered rock mass are more complex than homogeneity rock mass.Based on the study of equivalently anisotropic elastic parameters for rock mass and combined with jointed material model in ABAQUS,the subroutine of the constitutive model is established by Fortran Language and numerical implementation.A layered rock slope is calculated with numerical simulation by using the constitutive model with different working conditions.The calculation results demonstrate that the anisotropic and elastic-plastic constitutive model of layered rock mass is reliability,it provides numerical simulation basis for studying the anisotropic characteristics of layered rock mass in practical engineering.