“三软”大采高综采工作面覆岩结构及运动规律分析

以潘一煤矿"三软"煤层2141(3)综采工作面开采条件为背景,运用相似材料模拟实验和计算机FLAC3D数值模拟软件,对采高为6m的工作面的覆岩结构及顶底板破坏特征进行观测分析,研究表明:覆岩一般是分层或分组运动,垮落相互叠加;顶板距煤层越远,位移量越小,且具有滞后性;离层出现在应力降低区;垂直应力的峰值位置随着岩层高度的增加向煤壁后方移动,顶板和煤层中的最大垂直应力大于底板中的最大垂直应力;底板的破坏范围最大,并在工作面后方存在拉破坏。

Analysis on Overburden Rock Structure and Its Movement Rule in Three-soft Fully Mechanized Coal Face with Large Mining Height

Observations and analysis were carried out on the overburden rock structure and the caving characteristics of the roof and floor of 2141(3) fully mechanized face with 6m mining height in Panyi Mine according to the mining conditions of this face and by using the similar material simulation experiments and FLAC3D numerical simulation software.Research showed that the overburden rock generally moved in layers or groups,the roof rock caved and overlapped each other;the farther the distance from the roof to the seam,the smaller the displacement,and the roof displacement had a lag;the overburden separation layer appeared in the stress reduction area;the peak value position of the vertical stress trended to move to the coal wall back with the increase of the rock layer height,the maximum vertical stress in the roof and coal seam was larger than that in the floor;the failure range of the floor was the largest,and there was a tensile failure behind the face.