近距离煤层采空区下淋水巷道稳定性分析  

Stability Analysis of Water Pouring Roadway under Goaf in Close Distance Coal Seam

作　　者：魏启明 王虎 胡亚军 杨宗泉 张海龙 刘玉德[2] WEI Qiming;WANG Hu;HU Yajun;YANG Zongquan;ZHANG Hailong;LIU Yude(Shicaocun Coal Mine,CHN Energy Group Ningxia Coal Industry Company,Yinchuan 750000,China;School of Mine Safety,North China Institute of Science and Technology,Langfang 065201,China)

机构地区：[1]国家能源集团宁夏煤业公司石槽村煤矿,银川750000 [2]华北科技学院矿山安全学院,河北廊坊065201

出　　处：《煤炭技术》2024年第8期47-51,共5页Coal Technology

基　　金：河北省自然科学基金面上项目(E2022508046)。

摘　　要：为研究近距离煤层采空区下淋水巷道稳定性,以石槽村矿220605工作面运输巷为研究背景,通过实验室测试,现场监测与数值模拟相结合方法,开展淋水顶板巷道稳定性研究。研究结果表明:(1)淋水巷道顶板黏土矿物中富含高岭石、蒙脱石、伊利石以及绿泥石,遇水后会迅速膨胀并逐渐流变破碎,从而导致围岩滑移。(2)水软化岩石初期,其峰值强度显著减小,且在破坏前、后表现出波浪式的承载特性。顶板岩石含水率从干燥增长至近饱和状态时,抗压强度、弹性模量、内摩擦角、黏聚力分别减小88.56%、62.45%、33.81%和58.54%。(3)水作用下的巷道塑性破坏主要为剪切破坏;随着围岩含水率的增大,顶底板塑性破坏范围变化不大,但顶板在水软化效应的承压能力不断削弱,两帮间接承压力明显提升,塑性破坏范围变化趋势为先线性增大而后趋于稳定。In order to study the stability of the water pouring roadway under the goaf of the close distance coal seam,with the transportation roadway of the 220605 working face in Shicaocun mine as the research background,the stability of the water pouring roof roadway was studied through a combination of laboratory testing,on-site monitoring,and numerical simulation.The research results indicate that:(1)The clay minerals in the roof of the drainage tunnel are rich in kaolinite,montmorillonite,illite,and chlorite.These substances rapidly expand and break in volume after encountering water,gradually rheological,causing the surrounding rock to slip and causing tunnel instability.(2)In the early stage of water softening of rocks,their peak strength significantly decreases,and their wave like bearing characteristics before and after failure.When the water content of the roof rock increases from dry to nearly saturated state,the compressive strength decreases by 88.56%,the elastic modulus decreases by 62.45%,the internal friction angle decreases by 33.81%,and the cohesion decreases by 58.54%.(3)The plastic failure of tunnels under water action is mainly shear failure;as the water content of the surrounding rock increases,the plastic failure range of the top and bottom plates does not change much,but the bearing capacity of the top plate under the water softening effect is continuously weakened,and the indirect bearing stress of the two sides is significantly increased.The change trend of the plastic failure range first increases linearly and then tends to stabilize.

关 键 词：近距离煤层 淋水顶板 矿物成分 水质分析 监测与模拟反演 

分 类 号：TD327[矿业工程—矿井建设]