水-力耦合下隔水关键层渗透性演化特征  

Permeability Evolution Characteristics of Water-Resisting Key Layer Under Water-Force Coupling

作　　者：谢国良 胡博[2] 单成方 杨旭[2] 龙岩 牛昆 王海洋 XIE Guoliang;HU Bo;SHAN Chenfang;YANG Xu;LONG Yan;NIU Kun;WANG Haiyang(Kuqa County Yushuling Coal Mine Co.,Ltd.,Kuqa,Xinjiang 842014,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]库车市榆树岭煤矿有限责任公司,新疆库车市842014 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州市221116

出　　处：《矿业研究与开发》2024年第4期114-122,共9页Mining Research and Development

摘　　要：隔水关键层对水体及含水层下煤层安全开采影响重大。为了研究隔水关键层渗透性演化规律及采动隔水关键层的隔水性能,以新安煤矿15130工作面水库下采煤为工程背景,开展隔水关键层水-力耦合渗流试验和采动隔水关键层隔水性能数值模拟试验。结果表明:承载压缩下隔水关键层渗透系数-应变曲线可分为4个阶段,且与应力-应变曲线的4个阶段对应,分别为渗透系数骤减阶段、渗透系数缓慢递减阶段、渗透系数缓慢回升阶段、渗透系数骤增阶段;压密阶段围压的变化更容易引起隔水关键层渗透系数的变化,水压与渗透系数在1~2 MPa范围内不成正相关关系;15130工作面上方隔水关键层在采动影响下发生弯曲变形,但整体上看,隔水关键层依然具有良好的隔水性能。研究结果对水体下采煤具有一定的借鉴意义。The water-resisting key layer has a great influence on the safe mining of coal seam under water body and aquifer.In order to study the permeability evolution law of the water-resisting key layer and the water-resisting performance of the water-resisting key layer during mining,taking the coal mining under the reservoir of the 15130 working face of Xin'an Coal Mine as the engineering background,the water-force coupling seepage test of the water-resisting key layer and the numerical simulation test of the water-resisting performance of the water-resisting key layer were carried out.The results show that the permeability coefficient-strain curve of the water-resisting key layer under bearing compression can be divided into four stages,which correspond to the four stages of the stress-strain curve,namely,the stage of rapid decrease of permeability coefficient,the stage of slow decrease of permeability coefficient,the stage of slow recovery of permeability coefficient and the stage of rapid increase of permeability coefficient.The change of confining pressure in the compaction stage is more likely to cause the change of permeability coefficient of the water-resisting key layer,there is no positive correlation between water pressure and permeability coefficient in the range of 1-2 MPa.The water-resisting key layer above the 15130 working face is bent and deformed under the influence of mining,but on the whole,the water-resisting key layer still has good water-resisting performance.The research results have certain reference significance for coal mining under water.

关 键 词：隔水关键层 隔水性能 水-力耦合 渗透系数 水体下采煤 

分 类 号：TD823.83[矿业工程—煤矿开采]