大采高与分层开采工作面采场围岩结构特征比较

Comparison on Structure Characteristics of Overlying Strata between Large Mining Height and Slicing Face

利用有限差分数值模拟软件Flac3d,根据淮北矿业集团许疃煤矿7219工作面的实际开采情况,对比分析了大采高与分层开采工作面采场围岩结构特征。研究表明,大采高工作面覆岩运动加剧,两带高度较分层开采明显增大,覆岩压力拱形态更加发育,且超前支承压力的应力峰值大、作用范围广、峰值点位置较分层开采情况下远离煤壁。

Based on the mining operations in Xutuan Coal Mine 7219 owned by Huaibei Coal Mining Group, Flac3d-finite difference numeri- cal simulation software is adopted, drawing the comparison between the structure charaeteristies of overlying strata and that of slicing face. The study indicates that compared with slicing face, when the intensification of move of overlying strata＇s working face, the height of two belts in- creased substantially, overlying strata＇s pressure arch strengthened, and peak stress of tore abutment pressure as well as its scale enlarged in large mining height. Moreover,the peak stress distanced itself from the working face further than that of slicing face.