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节理岩体的力学性质主要由节理控制，在地震动载荷的作用下，节理可能滑移、张开。在有临空面时，节理岩体将表现出显著的几何非线性和大变形。地下洞室在原岩应力作用下可能还处于稳定状态，但在动载荷作用下就可能失稳破坏。本文采用了动力离散元法对一个大断面地下洞室在地震载荷的作用下的动力影响及围岩稳定性进行了分析，并模拟出围岩失稳和破坏的全过程，有助于对节理岩体中洞室围岩变形和破坏机制的认识。
The mechanical properties of jointed rock mass are mainly controlled by joint. Under the action of earthquake dynamic load, the joint may slip and spread. When there is a free surface, the jointed rock mass will exhibit significant geometric nonlinearity and large deformation. Underground caverns may still be in steady state under the action of original rock stress, but they may be destabilized and destroyed under dynamic load. In this paper, the dynamic discrete element method is used to analyze the dynamic influence of a large-section underground cavern under earthquake load and the stability of the surrounding rock, and to simulate the whole process of surrounding rock instability and failure, Understanding of Deformation and Failure Mechanism of Surrounding Rock in Cavern in Rock Mass.