(1. 湘潭工学院资源工程系，湘潭411201；2. 中南工业大学资源环境与建筑工程学院，长沙410083)
摘 要: 应用断裂力学原理讨论分析了岩体的断裂特征，指出裂纹与自由边界发生相互作用可能引起裂纹的失稳扩展，进而裂纹相互连接形成一长的薄片状岩层，由此提出了岩爆发生机理的层裂屈曲模型。该模型认为岩爆的发生与分裂层屈曲断裂有关，岩体分裂层屈曲断裂的最小长度 lb可以通过考虑板的稳定性来估算，如果岩体分裂层足够长，岩爆将实际发生。此外，还指出岩体自由表面动力失稳型岩爆可用层裂屈曲模型来描述。
关键字: 岩爆；屈曲；岩爆机理；断裂力学
（1. Department of Resource Engineering, Xiangtan Polytechnic University, Xiangtan, 411201, P.R.China;
2. College of Resource, Environment and Civil Engineering,
Central South University of Technology, Changsha China 410083, P.R.China）
Abstract:The feature of rock mass fracture was studied using fracture mechanics theory. It was made clear that the unstable propagation of cracks is caused by the interaction between cracks and free surfaces, and then thin layers of rock mass are formed as a result of linking of cracks. A lamination spallation buckling model for formation mechanism of rockburst was developed based on the above conclusion. The required minimum length of the layer (lb) for buckling can be estimated by considering the layer as a plate. The rockburst will actually occur if the unstable growing crack which separates a layer is sufficiently long. The dynamic unstability of free surfaces of rock mass can be described by the model.
Key words: rockburst; buckling; rockburst mechanism; fracture mechanics
