富松散含水层下复合隔水层稳定性分析及渗流规律  

The Analysis of Composite Water-resisting Layer Stability and Seepage Rule Under Rich Unconsolidated Aquifer

作　　者：赵永树[1,2] 张东升[1,2,3] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221008 [2]煤矿资源与安全开采国家重点实验室,江苏徐州221008 [3]新疆大学地质与勘查工程学院,新疆乌鲁木齐830047

出　　处：《煤矿安全》2012年第7期26-29,34,共5页Safety in Coal Mines

基　　金：煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM08X02);江苏省"333高层次人才培养工程"资助项目(2007-6号);中国矿业大学中央高校基本科研业务费专项资金资助项目(2010ZDP02B02)

摘　　要：针对任楼矿6415工作面富松散含水层下安全采煤这一问题,基于材料力学以及采动渗流理论,采用理论计算与数值模拟的方法,对复合隔水层的结构稳定性、渗流稳定性以及采动覆岩渗流规律进行了研究。结果表明:工作面推进45 m左右时,复合隔水层发生破断,顶板渗流失稳系数为0.948,接近于1,存在顶板突水的可能。采空区后方和工作面前方煤壁处的渗流速度急速增加,导水裂隙主要分布在采空区后方和工作面前方煤岩层中部拉伸断裂处,并且闭合状态随覆岩的运动状态不断发生改变。According to the problem of safety mining at 6415 working face under rich unconsolidated aquifer in Renlou coal mine, the methods of theoretical calculation and numerical simulation were applied to analyze the structure and seepage stability of composite wa- ter - resisting layer, and also the seepage rule of.mining strata based on the material mechanics and mining seepage theory. The results showed that the composite water - resisting layer is broken after the working face advancing 45 m and the instability permeability coeffi- cient of roof is O. 948 which closed to 1, so there is a chance of roof water inrush. The seepage velocity of coal wall in the rear of gob and the front of working face increases sharply. The water flowing fractured is mainly distributed in the tensile fractures of coal bed cen- tral part in the rear of gob and the front of working face and the state of the transfixion crack is changing with the motion of overburden.

关 键 词：松散含水层 复合隔水层 导水裂隙 采动渗流 数值模拟 

分 类 号：TD745[矿业工程—矿井通风与安全]