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以南屯煤矿9303工作面为工程背景,研究了孤岛“综放”工作面发生矿震的水平应力突变的力学机理。通过将上覆岩层中的各坚硬岩层简化成两对边简支、两对边固支的弹性矩形薄板力学模型,并对固支端施加由采动引起的水平应力,即以水平应力作用下的两对边简支、两对边固支弹性矩形薄板为力学模型,分析了9303工作面上覆坚硬岩层的应力分布,并研究了其极限垮落步距。以此为基础,预测了南屯9303工作面发生矿震并诱发冲击地压的步距,在此基础上对预测的危险区进行了卸压。在预计的位置发生2.6级矿震时,没有造成灾害,证明了厚硬顶板断裂引起的矿震是可以预测的。
Taking the 9303 working face of Nantun Coal Mine as the engineering background, the mechanics mechanism of horizontal stress sudden change of mine earthquakes in island "Caving Face is studied. By simplifying the hard rock formations in the overlying strata into the mechanical models of elastic rectangular thin plates fixedly supported by two pairs of edges and supported by two pairs of edges, horizontal stress caused by mining is applied to the ends of the strata, that is, under horizontal stress The two pairs of edge simply supported and the two pairs of side fixed elastic rectangular thin plates are used as the mechanics model. The stress distribution of hard rock layer over 9303 working face is analyzed and the ultimate caving step distance is studied. Based on this, the pitches of mine rockburst and the induced rock burst induced by Nantun 9303 working face were predicted. Based on this, the predicted danger zone was relieved. When a magnitude 2.6 mine shock occurred at the predicted location, no disasters were caused, which proved that the mine shock caused by the fracture of thick and hard roof was predictable.