动力扰动诱发巷道围岩冲击失稳的能量密度判据

Criterion of Impactive Instability of Laneway Under Dynamic Disturbance

能量积聚程度及积聚位置是判别冲击矿压是否发生的两个重要参数,运用ANSYS/LS-DY-NA模拟了应力波作用下巷道围岩的能量积聚过程及应力波强度对能量积聚程度的影响,得到了一定围岩应力状态下巷帮围岩能量积聚的大小、位置等结果。模拟研究表明:应力波是巷帮能量积聚、继而诱发冲击矿压的一个重要因素;应力波强度决定了最大能量密度值及其位置,随着扰动应力波强度的增加,巷道围岩的最大能量密度随之增加,最大能量密度点的位置渐渐向巷帮边界面靠近。研究结果对揭示煤矿冲击矿压的诱发机理及冲击矿压发生的预测预报具有重要意义。

The energy accumulation degree and its position are two primary factors for judging the rock burst occurring. Software ANSYS/LS-DYNA is applied to simulate the process of the energy accumulation and the affection of the stress wave intensity to the energy accumulation degree, the character and position of the energy accumulation are gained. The research results show that the stress wave is an important factor to accumulate the energy in surrounding rock and may induce the rock burst, and the maximal energy density and position are determined by the stress wave intensity. The maximum energy density increases and the position of the maximum energy density approaches to the rib of the laneway with the the increasing stress wave intensity.