中文摘要：

基于复杂网络理论,采用兼顾力学失效机制与几何拓扑破坏的方法对危岩群体空间拓扑关系进行描述,将危岩群体拓扑网络的节点和边用块体强度与块体接触力学指标表征,通过网络节点重要度指标确定关键块体位置。危岩群体崩塌模拟算例表明：关键块体破坏后,群体拓扑网络最大连通度（LCC）突然从0.567减小到0.3,而此后基本保持不变,证明该关键块体对危岩群体的稳定性有着至关重要的影响。

英文摘要：

Based on the complex network theory,the spatial topology relationship of the unstable rock groups was described by a method considering both mechanical failure mechanism and geometric topological damage. The nodes and edges of the topology network in the unstable rock groups were characterized by block strength and block contact mechanical index,the location of the key block was determined by network node importance index. The simulation of the unstable rock group collapse showed that the largest uni-com degree（ LCC） of the group topology network had a sudden decrease from 0. 567 to 0. 3 and kept basically unchanged,thus it proved that the stability of the unstable rock groups was determined by the key block.