论文部分内容阅读
为研究开采上保护层对巨厚砾岩断裂诱发冲击的防治作用,根据跃进煤矿25采区的地质条件和采掘条件,将25110工作面下巷作为研究对象,从理论上分析了动静载叠加诱发冲击矿压的机制以及开采上保护层后的防冲原理,数值模拟研究了未开采上保护时和开采上保护层后在同等强度的动载扰动应力的影响下巷道底板的位移、速度、应力以及塑性区的变化规律,进行相似模拟试验研究了人工震源的作用下未开采上保护时和开采上保护层后巷道底板的加速度和动应力响应规律。结果表明,上保护层开采后能够有效地释放围岩内部的高应力,且采空区顶板自然垮落,形成的软弱松散岩层结构,能够更好地起到对动载扰动应力波的衰减作用,从而降低了冲击矿压发生的可能,一定程度上能够较好地防治冲击矿压。研究成果对巨厚砾岩下冲击矿压的防治具有一定指导意义。
In order to study the protective effect of protective layer on the fracture-induced shock of huge thick conglomerate, according to the geological conditions and mining conditions of No.25 mining area in Yuejin Coal Mine, 25110 working face is taken as research object, Rock burst mechanism and the anti-erosion principle after mining the upper protective layer, numerical simulation was conducted to study the displacement, velocity and stress of the floor under the influence of dynamic disturbed dynamic stress And the variation rule of plastic zone, the similar simulation test was conducted to study the response of acceleration and dynamic stress of the roadway floor under the protection and mining of the protective layer under the action of artificial seismic source. The results show that the upper protective layer can effectively release the high stress inside the surrounding rock and the roof of the goaf collapses naturally. The soft and loose rock formation can better attenuate the dynamic stress wave , Thus reducing the possibility of rock burst, to a certain extent, be able to better control rock burst. The research results have certain guiding significance for prevention and control of rockburst under huge thick conglomerate.