(1. 湘潭工學(xué)院資源工程系，湘潭411201；2. 中南工業(yè)大學(xué)資源環(huán)境與建筑工程學(xué)院，長沙410083)
摘 要: 應(yīng)用斷裂力學(xué)原理討論分析了巖體的斷裂特征，指出裂紋與自由邊界發(fā)生相互作用可能引起裂紋的失穩(wěn)擴(kuò)展，進(jìn)而裂紋相互連接形成一長的薄片狀巖層，由此提出了巖爆發(fā)生機(jī)理的層裂屈曲模型。該模型認(rèn)為巖爆的發(fā)生與分裂層屈曲斷裂有關(guān)，巖體分裂層屈曲斷裂的最小長度 lb可以通過考慮板的穩(wěn)定性來估算，如果巖體分裂層足夠長，巖爆將實(shí)際發(fā)生。此外，還指出巖體自由表面動力失穩(wěn)型巖爆可用層裂屈曲模型來描述。
關(guān)鍵字: 巖爆；屈曲；巖爆機(jī)理；斷裂力學(xué)
（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
