煤层群上保护层开采保护效果现场考察  

Investigation on Protective Effect of Upper Protective Coal Seam Mining in Coal Seam Group

作　　者：文虎 樊世星 卢平 刘文永[1] 程小蛟 WEN Hu1, FAN Shixing1,2, LU Ping1,2, LIU Wenyong1, CHENG Xiaojiao1(1. College of Safety Science and Engineering, Xi＇an University of Science and Technology, Xi＇an 710054, China;2.Department of Safety Engineering, Anhui Jianzhu University, Hefei 230601, Chin)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]安徽建筑大学安全工程系,安徽合肥230601

出　　处：《煤矿安全》2018年第3期155-159,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51504186);陕西省教育厅科研计划资助项目(14JK1476);安徽省教育厅自然科学研究资助项目(KJ2016JD02)

摘　　要：针对新庄孜矿B组煤多层突出煤层开采过程中,大剥皮式的保护层开采方式造成保护范围逐层减小、可采出量严重损失等问题,根据巷道实际布置情况分别选择3个合适位置施工考察钻孔,对B8煤66208工作面开采过程中,B6煤层倾向和走向方向上的瓦斯压力、瓦斯含量和煤层变形进行现场考察。确定B8煤倾向上部、下部卸压角分别为79°和86°,走向方向卸压角75°,实际卸压角均比理论值大,保护范围也发生了扩界。B8煤层开采后B6煤的透气性系数相比原始煤层透气性系数增加了902倍,瓦斯压力和瓦斯含量分别降至0.22 MPa和2.43 m^3/t,B6煤层消突效果显著。In the mining process of coal group B with multi outburst coal seams in Xinzhuangzi Coal Mine, the mining method from top to bottom would lead to the decrease of effective protection region layer by layer and serious loss of re-coverable resource. According to the actual layout of the roadways, three suitable positions were selected to construct boreholes to investigate the gas pressure, gas content and coal seam deformation of trend and inclination in B6 coal seam, during the mining of 66208 working face. As results, the upper and lower pressure relief angles in the tendency of B8 coal seam were determined to be 79 °and 86° respectively and the pressure relief angle of direction was 75°. All three pressure relief angles are larger than the theoretical value, which indicates that the actual effective protective region is extended. After the exploitation of B8 coal seam, the permeability coefficient of B6 coal increased by 902 times compared with the original coal seam, with the gas pressure and gas content dropping to the 0.22 MPa and 2.43 m^3/t, respectively. So, the effect of eliminating outburst is remarkable.

关 键 词：煤层群 突出煤层 保护层开采 消突 保护范围 

分 类 号：TD712[矿业工程—矿井通风与安全]