裂隙岩体局部化破坏多重势面分叉模型及其应用

采用多重势面弹塑性分又理论对裂隙岩体的破坏机制进行计算模拟。基于多重势面弹塑性理论分析局部化问题，构造了适用于裂隙岩体破坏的多重势面不连续分叉模型，建立了求解局部化方向的数值方法。在有限元方法的基础上，使用该模型计算了裂隙岩体的局部化破坏条带，即主开裂条带。相关的算例分析表明，这一模型用于分析裂隙岩体的局部化破坏是有效的。

MULTIPLE POTENTIAL DISCONTINUOUS BIFURCATION MODEL FOR JOINTED ROCKS AND ITS APPLICATION

In the framework of the multiple potential surface elasto-plastic theory,the discontinuous bifurcation model used to simulate the failure of the jointed rocks is presented in this paper. Classical localization analysis is performed to the tangent stiffness tensor,thus the condition for discontinuous bifurcation is derived. Numerical method is formulated to calculate localization directions. With the aid of FEM,analysis is made on several corresponding specimen with initial distributed cracks under tension and compression.