煤层内高储能释放产生的应力波对冲击矿压的解锁机制探讨

Study on unlocking mechanism of rockburst induced by stress wave of high energy release in coal strata

在分析采掘空间周围煤岩体结构中冲击能量储存和释放特征的基础上,建立了煤层内震动应力波传播模型,并对采掘空间附近煤岩结构的破坏失稳进行了数值模拟研究。研究认为,深部储能体能量释放时产生的震动应力波对闭锁体结构产生破坏,使得煤层内侧向约束阻力突然下降,能量释放的通道被打开,煤层冲击危险性增大。相同动载作用下,随着动载施加位置逐渐远离巷帮,近帮煤体拉破坏程度减弱,且煤层内的侧向约束阻力降低程度越来越弱。研究结果在现场冲击矿压防治中得到了很好的应用。

Based on the analysis of energy storage and release characteristics in coal and rock mass around the mining space,the stress wave propagation model in coal mass was established and the instability of coal-rock structure nearby the mining space was studied using numerical simulation. The results indicate that failures are induced by stress wave of energy release in deep coal mass,thereby the lateral restraint resistance suddenly drops in the coal seam and the passage of the deep energy release is opened. Under the same dynamic loading,as the moving load application position is gradually away from the edge of roadway,the degree of tensile failure of the near roadway coal is weakened and the degree of lateral restraint resistance reduction in the coal seam is getting weaker and weaker. The results are well applied in the prevention and control of rockburst on site.