顶板性质对动载传播规律影响的模拟研究

Numerical Simulation of Properties of the Roof Affecting Dynamic Disturbance Propagation Law

煤矿动载扰动易诱发巷道冲击破坏,为研究巷道顶板岩层性质对动载诱发巷道冲击破坏的影响,运用FLAC2D软件中的动态模块,研究分析了不同岩性的顶板下,震动波在巷道顶板传播的速度、位移和加速度的变化规律以及震动波引发的巷道顶、底板和左、右帮位移的变化规律,并对规律进行分析和解释,为预防冲击矿压提出了技术措施。研究表明:震动波在顶板岩层中传播时,随着传播距离的增大,震动波引起的顶板岩层质点的速度、位移和加速度以幂函数的形式进行衰减。在传播距离相同时,顶板岩层岩性越弱,震动波引起的顶板质点的速度、位移和加速度越大;动力扰动发生在巷道上方一侧,巷道顶板和靠近动力扰动一侧的巷帮和顶板比远离动力扰动的巷帮和底板更易发生冲击矿压。

Dynamic disturbances can lead to rock burst in coal mining. In order to study on the influence of the properties of the roof on rock burst risk in roadway, by using the dynamic module of FLAC2D program, studied and analyzed under the roof of different lithology the vibration wave variation law of velocity, displacement and acceleration in the roadway roof propagation and the variation law of the roof, floor and sides displacement in the roadway caused by vibration wave. The variation law was analyzed and explained. Technical measures for the prevention of rock burst are provided. The result indicates that when the vibration wave propagated in the roof strata, as the propagation dis tance increased, the velocity, displacement and acceleration on the roof strata particle caused by vibration wave in the form of power function declined. With the same propagation distance, the lithology of the roof is weaker, the velocity, displacement and acceleration on the roof particle caused by vibration wave is larger. The dynamic disturbance hap pens at the upper part of one side of roadway, rock burst is easier to happen at the roof and the side near the dynamic disturbance of the roadway