近距离煤层群上覆煤层开采底板卸压范围及效果考察研究  

Investigation and Study on Floor Pressure Relief Range and Effect of Overlying Coal Seam Mining in Close Distance Coal Seam Group

作　　者：秦兴林 曹垚林 孟祥宁 倪兴 QIN Xinglin;CAO Yaolin;MENG Xiangning;NI Xing(China Coal Research Institute,Beijing 100013,China;CCTEG Shenyang Research Institute,Fushun 113112,China;State Key Lab of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团沈阳研究院有限公司,辽宁抚顺113112 [3]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤炭技术》2025年第2期68-71,共4页Coal Technology

摘　　要：为了掌握近距离煤层开采后,在其底板卸压范围内的下伏煤层实际卸压效果情况,以吕梁矿区某矿井3103工作面为研究对象,运用理论计算、数值模拟及井下实测相结合的方法,分析了上覆煤层开采后底板在倾斜方向、走向方向和层间垂向3个方向的卸压范围,并对下伏4^(#)、5^(#)煤层的残余瓦斯含量及残余瓦斯压力进行了现场考察。现场结果表明:3103工作面开采后,4^(#)、5^(#)煤层完全处于卸压范围,卸压效果明显,其中4^(#)煤层残余瓦斯含量为4.89 m^(3)/t;5^(#)煤层残余瓦斯含量为6.32 m^(3)/t;下降率分别为52.38%、39.34%,且瓦斯含量均降到8 m^(3)/t以内;4^(#)煤层残余瓦斯压力为0.4 MPa;5^(#)煤层残余瓦斯压力为0.52 MPa;下降率分别为25.92%、17.46%,且瓦斯压力均小于突出临界值0.74 MPa,为矿井后续4^(#)、5^(#)煤层巷道位置选择及区域瓦斯治理规划提供了科学支撑。In order to grasp the actual depressurization effect of the underlying coal seam within the floor depressurization range after the close seam mining,taking the 3103 working face of a mine in Lvliang mining area as the research object,the depressurization range of the floor after the mining of the overlying coal seam in three directions,namely the inclined direction,the strike direction and the vertical direction between layers,is analyzed by combining theoretical calculation,numerical simulation and underground measurement.The residual gas content and residual gas pressure of coal seam No.4 and No.5 were investigated on site.The field results show that No.4 and No.5 coal seams are completely in the pressure relief range after 3103 working face mining,and the pressure relief effect is obvious,and the residual gas content of No.4 coal seam is 4.89 m^(3)/t;the residual gas content of No.5 coal seam is 6.32 m^(3)/t;the decrease rates were 52.38%and 39.34%,respectively,and the gas content was reduced to less than 8 m^(3)/t.The residual gas pressure of No.4 coal seam is 0.4 MPa;the residual gas pressure of No.5 coal seam is 0.52 MPa;the decrease rates are 25.92%and 17.46%respectively,and the gas pressure is less than the critical value of 0.74 MPa,which provides scientific support for the location selection of the subsequent No.4 and No.5 coal seams and regional gas control planning.

关 键 词：近距离煤层 卸压范围 残余瓦斯含量 残余瓦斯压力 区域防突 

分 类 号：TD712[矿业工程—矿井通风与安全]