浅埋煤层坚硬直接顶破断诱发冲击地压机理及防治

发布时间：2018-02-27 15:54

本文关键词： 坚硬直接顶冲击地压致灾机理防治　出处：《煤炭学报》2017年02期 　论文类型：期刊论文

【摘要】：针对浅埋缓倾斜煤层坚硬直接顶下回采工作面冲击地压问题,采用微震及矿压监测方法确定了坚硬直接顶超前工作面破断的位置及顶板周期来压步距,在此基础上分析了回采工作面冲击地压的能量来源和致灾机理,建立了坚硬直接顶超前工作面破断的力学模型,推导了直接顶初次破断和周期破断的步距公式并计算得到了直接顶超前工作面的破断距离。结果表明,直接顶的周期破断步距以及破断产生的矿震能量均比基本顶周期来压步距及矿震能量小,但由于直接顶距离煤层近以及直接顶超前工作面破断位置距离煤壁过小,坚硬直接顶的周期破断引起的动载增大了工作面冲击地压危险。据此确定了在巷道进行直接顶预裂爆破以增大直接顶超前工作面煤壁破断距离的冲击地压治理措施,微震监测结果显示超前预裂爆破有效降低了工作面冲击地压危险。
[Abstract]:The shallow gently inclined coal seam mining under hard roof working face of rockburst, a microseismic and mine pressure monitoring methods to determine the direct roof working face breaking hard leading position and broken roof periodic weighting, based on the analysis of the working face of rockburst energy source and damage mechanism, establish the hard roof working face advanced mechanics model of breaking, deduces the first roof breaking and cycle breaking step distance formula and calculate the direct roof ahead of working face breaking distance. The results show that the cycle of immediate roof breaking fault rockburst energy step and breaking the basic roof the periodic weighting step distance and seismic energy is small, but because of the immediate roof and top coal seams near directly ahead of the face breaking position from the coal wall is too small, hard roof breaking cycle directly caused by dynamic load increases the impact of working face Based on this, we determined the control measures for rock burst in the roadway with direct roof pre splitting blasting to increase the breaking distance of the coal wall at the direct top, and the microseismic monitoring results showed that the pre splitting blasting effectively reduced the risk of rock burst at the working face.

【作者单位】：辽宁工程技术大学土木与交通学院;神华新疆能源有限责任公司;
【分类号】：TD324

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