冲击地压的能量机理及其应用  

Energy mechanism of rock burst and its application

作　　者：姚精明[1] 何富连[2] 徐军 窦林名[4] 

机构地区：[1]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044 [2]中国矿业大学资源与安全工程学院,北京100083 [3]中煤集团沈阳设计院,辽宁沈阳110015 [4]中国矿业大学矿业学院,江苏徐州221008

出　　处：《中南大学学报（自然科学版）》2009年第3期808-813,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50074030);国家自然科学基金重大资助项目(50490270)

摘　　要：根据煤岩体在变形过程中宏细观能量耗散,得出煤岩体裂纹尖端拉应力过大而失稳扩展是冲击地压发生的根本原因;定义弹性能衰减度和塑性能变化率。研究结果表明:弹性能衰减度与弹性模量E成正比,当受载煤岩体应变达到3-3^(1/2)/2ε0时,弹性能衰减度取得最大值(13^(1/2))Eexp(-3+3^(1/2)),若弹性能衰减度大于临界值,则冲击地压就会发生;塑性能变化率和岩体破坏过程中电磁辐射脉冲数呈0.168的正比关系;降低煤体裂纹尖端拉应力和弹性模量是防治冲击地压的有效途径,在此基础上提出煤层注水防治7339工作面冲击地压的方案,工程实践证明,该方案是切实有效的。Based on theories of maeroscopical and microscopical energy dissipation during rock and coal mass distortion, it is proved that the reason why crack development is unstable is that tensile at crack tip causes rock burst to happen. Elastic energy attenuation degree and plastic energy change rate were defined. The results show that the maximum value is（1-/3）Eexp（-3＋/3）when strain of loaded coal-rock is3-/3/2ε0,and rock burst happens when elastic energy attenuation degree surpasses the marginal value. The pulse number of electromagnetic radiation is directly proportional to plastic energy change rate. Decreasing tensile at crack tip and elastic module are effective ways to prevent rock burst from happening. In this foundation, water infusion is brought out to prevent rock burst in face 7339 from happening. Project practice proves that the scheme is effective.

关 键 词：裂纹 能量耗散 塑性能变化率 弹性能衰减度 电磁辐射 

分 类 号：TD324[矿业工程—矿井建设]