【摘要】 利用断裂力学理论分析了纯剪切应力状态和双向压应力状态作用下节理模型的断裂机制。在已有的数值模拟和实验基础上,通过引入分形维数,推导了粗糙节理的摩尔-库仑剪切强度的改进公式。该公式的分析结果显示,节理尺度相对于岩体尺寸越大,节理的抗剪强度就越低,并且节理的抗剪切强度与分形维数的关系是一种非线性增长关系。更多还原

【Abstract】 The fracture mechanism for the joint model under pure shearing stress state and two dimensional compressive stress states is analyzed by means of fracture mechanics theory.Based on the result of the numerical simulation and test method,the modified expression of Mohr-Coulomb shear strength criterion for roughness joints is deduced from introducing fractal dimension.The modified expression shows that the shearing strength of rock joint decrease with the increase of the joint scale;and the relation between shearing strength of rock joint and fractal dimension is increased non-linearly.更多还原