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基于层状岩体变形及强度的各向异性特征,在McLamore&Gray强度准则的基础上,利用Mohr-Coulomb强度准则与Drucker-Prager强度准则之间的参数变换关系,将各向同性Drucker-Prager强度准则推广到层状岩体中,并由此建立层状岩体的各向异性弹塑性本构模型。给出此本构模型的隐式积分算法及一致切线刚度矩阵,并利用ABAQUS所提供的用户材料子程序UMAT接口,对模型进行数值实现,用以对层状岩体进行应力变形分析。
Based on the anisotropy of deformation and strength of layered rock mass, based on the McLamore & Gray strength criterion and the parametric transformation relationship between Mohr-Coulomb strength criterion and Drucker-Prager strength criterion, the isotropic Drucker-Prager strength criterion It is extended to layered rock masses and an anisotropic elasto-plastic constitutive model of layered rock mass is established. The implicit integration algorithm and consistent tangent stiffness matrix of this constitutive model are given. The UMAT interface provided by ABAQUS is used to numerically simulate the deformation of layered rock mass.