潘二矿3煤卸压开采瓦斯治理技术研究

发布时间：2018-04-24 23:27

  本文选题：首采层开采 + 卸压层　； 参考：《安徽理工大学》2015年硕士论文

【摘要】：矿井瓦斯灾害日趋严重,特别是煤与瓦斯突出事故时有发生,煤矿瓦斯治理成为煤矿安全至关重要的问题。为防治多煤层开采时煤与瓦斯的突出,采用首采层的卸压作用,消除邻近煤层的突出危险性是行之有效、十分经济的区域性防突措施。由于淮南潘二煤矿4煤具有煤与瓦斯突出危险性,所以选择首先开采其下方平均间距为80m的没有瓦斯突出危险的3煤层,通过下首采层3煤的采动影响,使得4煤卸压,达到降低其瓦斯突出危险性。 论文中采用理论分析、计算机数值模拟软件以及结合工程实践的研究方法,对下首采层回采后上被卸压煤岩体的应力分布特点、上伏煤岩体采动裂隙动态分布特征、煤层膨胀变形、远程卸压瓦斯流动规律、煤层卸压范围进行系统的研究。利用数值计算模拟的方法研究了首采层开采影响上伏煤岩体应力分布和膨胀变形等；通过现场实测考察了随工作面的推进首采层瓦斯压力变化规律、透气性变化规律、首采层在采动影响下的膨胀变形规律和卸压瓦斯抽放效果。 通过淮南潘二煤矿下首采层开采工程实践表明,卸压层得到了很好的卸压效果,实际测量卸压层4煤层的最大膨胀变形率为18.68‰；卸压后4煤透气性系数达到31.95m2/MPa2·d,4煤原始透气性系数为0.054m2/MPa2·d,透气性增大592倍。采用底板巷网格式穿层钻孔瓦斯抽采技术对卸压层进行卸压瓦斯抽采,保护范围内的4煤瓦斯抽采率达到64.1%,卸压层残余瓦斯含量为2.21m3/t,残余瓦斯压力降为0.16MPa,表明卸压层取得良好的卸压瓦斯抽放效果；被保护范围内的4煤的瓦斯含量得到大幅度减少,消除了突出危险性,确保了卸压层的安全开采。同时通过综合对比分析表明,理论分析、数值模拟和现场试验研究所得到的结论具有很好的一致性。
[Abstract]:Mine gas disaster is becoming more and more serious, especially coal and gas outburst accidents occur from time to time. In order to prevent the outburst of coal and gas in multi-seam mining, it is an effective and economical regional anti-outburst measure to adopt the pressure-relief effect of the first coal seam and eliminate the outburst danger of the adjacent coal seam. Because of the danger of coal and gas outburst in No. 4 coal mine of Paner Coal Mine, Huainan Pan2 Coal Mine, the No. 3 coal seam which has no danger of gas outburst, which has an average distance of 80 m under the coal seam, is mined first, and the pressure relief of No. 4 coal is made through the influence of the mining effect of No. 3 coal in the lower first coal seam. To reduce the risk of gas outburst. In this paper, theoretical analysis, computer numerical simulation software and engineering practice are used to analyze the stress distribution and dynamic distribution of coal and rock mass under the upper pressure after the mining of the lower first mining strata, as well as the dynamic distribution characteristics of the mining fractures. The expansion deformation of coal seam, the law of gas flow in remote pressure relief, and the pressure relief range of coal seam are systematically studied. By using numerical simulation method, the stress distribution and expansion deformation of coal and rock mass affected by the first mining seam mining are studied, and the gas pressure and gas permeability of the first coal seam with the advance of the working face are investigated by field measurement. The law of expansion and deformation of the first mining bed under the influence of mining and the effect of pressure relief gas drainage. Through the engineering practice of mining the first coal seam in Paner Coal Mine, Huainan Pan2 Coal Mine, it is shown that the pressure relief layer has a good pressure relief effect, and the maximum expansion deformation rate of the 4 coal seam in the pressure relief layer is 18.68 鈥，

本文编号：1798749