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针对跃进煤矿23130工作面下巷中间区域在巨厚上覆砾岩影响下发生多次冲击矿压事件的现象,对巨厚砾岩影响下的围岩高支承压力和高冲击危险性呈现集中分布的规律进行了研究。根据三维数值模拟研究结果,当两个或多个工作开采后,巨厚坚硬砾岩不能充分垮落,在采空区周边煤层中形成“O”型支承压力圈,巷道在采掘中应力和高冲击危险区域在中部区域危险性最大。通过电磁辐射监测和钻屑法的监测数据也说明巨厚砾岩影响下的巷道中间区域电磁辐射强度和钻屑量大于巷道两端。23130下巷在采掘过程中,中部区域多次冲击事件也证明了巨厚砾岩对围岩应力分布及冲击矿压影响的“O”型圈效应。研究成果对类似地质和开采条件下巨厚坚硬上覆岩层影响下的冲击矿压危险预警和防治具有一定的指导作用。
Aiming at the phenomenon of multiple rock burst under the influence of gigantic overlying conglomerate in the middle lane of 23130 working face of Yuejin coal mine, the high bearing pressure and high impact risk of surrounding rock under the influence of gigantum conglomerate show a concentrated distribution The law was studied. According to the results of three-dimensional numerical simulation, when two or more works are mined, the thick and hard conglomerates can not fully collapse, forming “O” type bearing pressure ring in the coal seam around the goaf, and the stress of the roadway in excavation And high impact areas are most at risk in the central area. The monitoring data of electromagnetic radiation monitoring and cuttings method also show that the intensity of electromagnetic radiation and the amount of cuttings in the middle of the roadway under the influence of the huge thick conglomerates are greater than the two ends of the roadway. During the excavation of Xiaxiang alley, multiple impact events in the middle part of the lower lane also proved the “O” ring effect of the huge thick conglomerate on the stress distribution and the rock burst of the surrounding rock. The results of the study can guide and prevent and control the danger of rock burst under the influence of thick and hard overburden strata under similar geological and mining conditions.