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寻找巨厚煤层上覆岩层裂隙带位置,合理布置高位钻孔的终孔位置,是提高巨厚煤层瓦斯抽采效率的关键。采用相似模拟,对水帘洞煤矿3801巨厚煤层综放工作面上覆岩层裂隙演化规律进行了试验研究。通过试验将上覆岩层裂隙演化分为6个区———顶板运动不明显区、微弱区、明显区、剧烈区、缓和区和稳定区;得出上覆岩层冒落带上限高度为45~55 m,裂隙带上限高度为93.0~100.7m。上覆岩层中出现垂直应力集中区和卸压区,覆岩离层主要出现在应力卸压区,在应力集中区或煤柱外侧不可能出现离层。根据试验结论,在水帘洞煤矿3801工作面布置了高位钻孔,现场应用结果表明:高位瓦斯抽采钻孔布置在距煤层顶板50m左右的范围内,其钻孔抽采平均瓦斯体积分数达到42%,6个钻孔平均抽放纯量为5.9m3/min。
It is the key to improve the efficiency of gas drainage in very thick coal seam by looking for the location of the fracture zone in the overburden of the thick and thick coal seam and reasonably arranging the final hole position of the high-level drilling. A similar simulation is used to study the evolution of the fissure evolution of overlying strata in the fully mechanized caving mining face of 3801 ultra thick seam in Shuiliandong Coal Mine. Through the experiment, the evolution of the overlying rock fissures is divided into six zones: the unobvious roof movement zone, the weak zone, the obvious zone, the violent zone, the easter zone and the stable zone. The upper limit of the overburden zone is 45 ~ 55 m, the upper limit of fracture zone is 93.0 ~ 100.7m. Vertical stress concentration zone and pressure relief zone appear in the overlying strata. The strata of the overlying strata appear mainly in the stress relief zone, and there is no possibility of delamination outside of the stress concentration zone or coal pillar. According to the conclusion of the experiment, high-level drilling holes are arranged on the 3801 working face of Shuiliandong Coal Mine. The field application results show that the high-level gas drainage borehole is arranged within a range of about 50m from the coal seam roof, and the average gas volume fraction of the borehole extraction reaches 42%, the average drainage volume of 6 boreholes is 5.9m3 / min.