急倾斜厚煤层顶底板移动特征的模拟研究

Simulation Study on Movement Characteristics of Roof and Floor of Steeply Inclined Thick Coal Seam

以新疆某煤矿急倾斜特厚煤层采煤工作面为工程背景,运用FLAC数值模拟软件对采后顶底板运动特征进行模拟研究,为相似赋存条件下的煤层开采提供了瓦斯涌出路径和预防顶板事故的理论基础。结果表明:随工作面煤层的开采,两侧顶板岩层中垂直应力分布表现为工作面前方出现应力升高区、峰值区和降低区,应力集中程度最大。煤层采出后,上覆岩层压力得到释放,在顶板产生一定深度的卸压区,其应力值仅有0.5 MPa。

As the engineering background,a steep thick coal seam coal face is being studied,using FLAC numerical simulation software to simulate post-harvest stope roof and floor rock and their movement characteristics.The results show that:when the working face coal seam is mined,both sides of the roof strata manifestations of stress distribution in the vertical stress increased area of work in front of square,peak area and the lower area.After the coal mined,the overburden pressure has been released,a certain depth of the relief area in the roof,only 0.5MPa stress values.