论文部分内容阅读
为判断滑塌式危岩体主控结构面断裂扩展方向和稳定性,在分析压剪复合裂纹尖端应力场的基础上,运用断裂力学,建立压剪裂纹的最大剪应力断裂判据,将岩石断裂问题与岩石Mohr-Coulumb破坏准则相联系,在裂纹端部压应力区建立基于Mohr-Coulumb准则的断裂判据。实例计算结果表明,两种断裂判据与已有的最大拉应力断裂判据结合使用,讨论其最不利稳定性,分析结果与极限平衡理论方法相吻合,并给出了裂纹端部破裂面发展方向。
In order to determine the fracture propagation direction and stability of the main structural plane of the rock mass, based on the analysis of the stress field at the tip of the compression-shear composite crack, the criterion of maximum shear stress of the compression-shear crack is established by using the fracture mechanics. The fracture problem is related to the Mohr-Coulumb failure criterion and a fracture criterion based on the Mohr-Coulumb criterion is established in the compressive stress zone at the crack tip. The calculated results show that the two kinds of fracture criteria are used in combination with the existing criterion of maximum tensile stress fracture to discuss the most unfavorable stability. The analytical results agree well with the theory of limit equilibrium, and the development of cracked surface at the crack tip direction.