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为解决工作面回采期间上隅角瓦斯超限问题,针对硫磺沟煤矿(4-5)04工作面实际情况,采用物理相似模拟方法,对工作面采动覆岩“三带”分布特征及规律开展研究,结合工作面实际情况设计高位钻孔抽采上隅角瓦斯,并对抽采瓦斯效果开展实时观测与分析。研究结果表明:(4-5)04工作面上隅角处的垮落角为71°左右且顶板裂隙较为发育;该工作面垮落带高度为25~26.8 m,断裂带高度为109.2~110 m,初次来压步距为36 m,周期来压步距平均为16.6 m,切眼附近裂隙区宽度约为40 m,回风巷及进风巷附近约30 m,工作面附近约20~40 m;高位钻孔抽采浓度为19.85%~23%,抽采过程中上隅角及工作面的瓦斯浓度分别为0.15%~0.48%及0.08%~0.45%,避免了回采期间上隅角瓦斯超限,保证工作面安全高效回采。
In order to solve the problem of methane overrun in the upper corner of the working face during mining, aiming at the actual situation of the working face (4-5) 04 in Sulfur Mine, physical similar simulation And the law to carry out research, combined with the actual situation of the face of high profile drilling design of the upper corner gas, and gas extraction effect real-time observations and analysis. The results show that the caving angle at the upper corner of (4-5) 04 working face is about 71 ° and the roof caving is more developed. The caving zone has a height of 25-26.8 m and the height of fault zone is 109.2-110 m, the first step pressure step is 36 m, the average cycle pressure step distance is 16.6 m, the width of the crack area near the cut hole is about 40 m, the return air passage and the air inlet near the tunnel about 30 m, about 20 ~ 40 m. The high-level drilling extraction concentration is 19.85% -23%. The gas concentrations in the upper and lower corners of working face during extraction are 0.15% -0.48% and 0.08% -0.45%, respectively. This avoids the upper corners Gas overrun, ensure safe and efficient mining face.