对离散元动力计算方法的理论基础进行了探索，主要是离散元动力计算的实现过程，边界条件和动力荷载的输入问题。在此基础上以某大型水电工程的地下厂房为例，计算在静力和地震荷载作用下，围岩的变形破坏情况，并监测了岩体不同时间速度和位移的变化情况。计算方法与成果可以为地下厂房的抗震工程设计提供指导。

The theory foundation of discrete element method (DEM) is studied in this paper firstly. Dynamic discrete element calculation principle and method, dynamic loading input and boundary conditions are introduced and discussed before application. Rock mass stability under earthquake load by means of a large hydropower underground powerhouse cavern is calculated then. The displacements and velocities of rock mass around powerhouse cavern are monitored. And the result shows that DEM can be used to solve structure-controlled failure under dynamic load. The method and idea can provide guidance for underground cavern anti-earthquake design.