富松散含水层下复合隔水层稳定性分析及渗流规律

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。

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

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 water-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 coefficient of roof is 0.948 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 central 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.