厚煤层综放开采覆岩移动规律数值模拟分析

Numerical Simulation Analysis of Overburden Strata Movement Rule at Fully Mechanized Caving Face with Thick Coal Seam

为了掌握高河矿综放工作面上覆岩层移动规律,为工作面布置及“三下”开采提供参考,结合高河矿E1302综放工作面地质情况,采用数值模拟方法,对工作面地表移动、上覆岩层移动及岩层破坏特征进行模拟分析。研究表明:岩层移动在基岩内衰减较为明显,在松散层内近似整体沉降,厚基岩具有一定的控制地表沉陷变形的能力;导水裂缝带发育髙度最大约为140 m,裂高采厚比为20;综放开采强度大,地表的沉陷变形值增大,地表裂缝增加,从而导致地表下沉系数增大。

To grasp the movement law of overlying overburden strata at El 302 fully-mechanized caving face in Gaohe Colliery and provide reference for the layout of working face and the"three underground"mining,the surface movement,overlying overburden strata movement and strata failure characteristics were simulated and analyzed by numerical simulation method,which shows that the attenuation of strata movement is obvious in the bedrock;the thick bedrock has certain ability to control the surface subsidence and deformation in loose bedrock with maximum height of about 140 m in water conduction fracture zone and ratio of fracture height to mining thickness up to 20;the higher the mining intensity is,the larger the coefficient of surface subsidence,the value of surface subsidence and deformation and the surface cracks are.