论文部分内容阅读
沿空煤柱工作面受采空区影响产生侧向支撑压力,回采时与超前支承压力产生应力叠加形成高应力集中,极易诱发冲击地压。以某矿5302沿空煤柱工作面为背景,提出采用综合指数法与可能性指数诊断法进行宏观评价,确定了冲击地压的类型,并结合数值模拟方法对该工作面进行应力分析。该工作面的冲击危险性指数为0.74,发生冲击地压的可能性指数为0.977,数值模拟显示回采过程中工作面煤壁前方的静态垂直应力约为35 MPa,通过评价该工作面具有中等冲击危险性。根据评价结论,在工作面回采前采取了预卸压措施,工作面实现了安全回采。
The effect of sideburning along the coal pillar face is affected by the gob, and the lateral support pressure is generated when the coal pillar faces along the coal seam. When the coal mining face is mining, the stress generated by superposing the support pressure is superposed to form a high stress concentration, which can easily induce the rock burst. Taking the 5302 coal pillar face of a mine as the background, this paper proposes a macroscopic evaluation of the comprehensive index method and the possibility index diagnosis method to determine the type of rock burst, and analyzes the stress of this face by numerical simulation. The impact hazard index of the working face is 0.74, and the probability index of rock burst is 0.977. The numerical simulation shows that the static vertical stress in front of the coal wall in the working face during mining is about 35 MPa. By evaluating that the face has moderate impact Dangerous. According to the conclusion of the evaluation, pre-relief measures are taken before the mining face is recovered, and the safe mining face is realized.