体元-区域-系统冲击地压模型及应用

Volume element-region-system rock burst model and its application

基于弹塑性力学和损伤力学原理,考虑到煤岩体内部存在大量节理裂隙,在弹塑脆性模型的基础上增加了结构面单元,构建了体能势函数,建立了能量的积聚、耗散与煤岩动态变形破裂过程之间的联系,并以此为依据从能量角度建立了体元-区域-系统冲击地压模型.结果表明:冲击地压是含结构面煤岩体组成的力学平衡系统在外界扰动作用下的失稳现象;基于该模型分析了煤岩系统在不同应力状态下变形破坏的演化规律及相应的地球物理信号特征;对跃进煤矿23130掘进工作面电磁辐射监测数据进行分析,验证了该模型的正确性.

Based on the elastic-plastic mechanics and damage mechanics principle,in view of the fact that there exist many joint fissures in the coal rock masses,the structural surface unit was added to the elastic-plastic-brittle model of rock burst.The volume element energy potential function was constructed,and the relationship among energy accumulation,dissipation and coal rock dynamic deformation failure process was also established.Then from the energy perspective,the volume element-region-system model of rock burst was established.The results show that rock burst is a failure process of the mechanical balance system of coal rock with structural surface under disturbance.Based on the model,the characteristics of coal rock de-formation and failure with different stress and the corresponding geophysics signals were analyzed.The model was verified through the electromagnetic radiation monitoring results on the23130 driving face of Yuejin coal mine.