浅埋深厚煤层覆岩破坏规律数值模拟

Numerical Simulation of Surrounding Rock Failure and Seepage Rule in Shallow Deep Coal Seam

针对长安煤矿4113工作面位于邵家湾沟流下,煤矿运用综采放后,顶煤全部垮落,地表水可能沿着开采产生的导水裂隙带流入井下,引发矿井水灾的问题,运用计算机数值模拟技术对4113工作面的不同推进长度进行了模拟,分析了开采过程中该工作面覆岩垂直应力变化、垂直位移量变化和塑性区破坏特征。结果表明,随着工作面向前推进,覆岩的垂直应力和位移量均呈现不断加大的趋势,而塑性区破坏轮廓形似拱形。

After the caving method of fully mechanized top-coal caving is adopted in the 4113 working face of changan coal mine,the water-conducting fissure zone generated may lead to the shaojiawan trench flow,make the surface water flow into the underground,increase the water inflow in the underground of the mine,or cause the mine flood.In order to solve this problem,a numerical simulation model is established.The results of computer numerical simulation show that the vertical stress and displacement of overburden increase with the advance of working face,and the failure contour of plastic zone looks like arch.