急倾斜矿山综采分段充填工作面底板破坏机理研究

以豫西某煤矿工作面为背景,对急倾斜煤矿综采分段充填工作面底板受力和支承压力分布进行了分析,并借助FLAC3D有限元差分软件对煤层开挖引起分段充填工作面底板的应力分布、位移变化和塑性区扩展情况进行模拟分析,研究了急倾斜矿山综采分段充填工作面底板破坏机理。研究表明:采空区充填体可以对直接顶起到支撑作用,并对底板的滑移变形起到控制作用;随着工作面开挖深度的增加,急倾斜矿山综采分段充填工作面底板中部和中部偏下的位置最容易发生破坏;工作面塑性区域集中在底板中下部,且随着煤层开挖工作面的加深,底板塑性区的深度和范围均逐渐增加,地层受煤层开采的影响区域也逐渐扩大。

Study on floor failure mechanism of fully mechanized subsection filling face floor in steeply inclined mine

Based on a working face in Hunan Xiangyong Coal Mine, the distribution of floor force and abutment pressure of fully mechanized subsection filling face in steeply inclined coal mine is analyzed. And with the help of FLAC3D finite element difference software, the failure mechanism of fully mechanized subsection filling face floor in steeply inclined mines is studied. The main conclusions are as follows: (1) The filling body in goaf can support the direct roof and control the sliding deformation of the floor. (2) With the increase of the excavation depth of the working face, the floor of the fully mechanized mining subsection filling face in steeply inclined mines is most likely to be damaged in the middle and lower part of the floor. (3) The plastic area of the working face concentrates in the middle and lower part of the floor, and with the deepening of the coal seam excavation face, the depth and scope of the plastic area of the floor gradually increase, and the area affected by the coal seam mining gradually deepens.