残煤复采工作面矿压显现规律的研究

Study on Mine Pressure Behavior for Residual Coal Mining Face

厚煤层受小窑"采顶丢底"方式破坏开采后,其下分层工作面矿压显现规律存在特殊性,通过对大同煤矿集团云冈矿8107复采工作面矿压显现实测结果分析可知:受上覆残留煤柱集中应力的影响,工作面周期来压明显的特征。工作面进出煤柱期间压力突然增大,且出煤柱压力峰值为进煤柱的1.5倍,进煤柱期间支架前柱工作阻力峰值是后柱的1.86倍,出煤柱期间支架前柱工作阻力峰值是后柱的0.45倍。本研究结果对类似条件下工作面矿压规律的研究具有一定的借鉴意义。

The strata behavior in work face is often affected by the upper coal seam that has been mined previ- ously by some private operation of the mine, the method of mining the upper part and leaving the lower part generates the special Strata behavior. Based on the site measurement and analysis in the 8107 mining face in Yungang coalmine, affected by the concentrated stress of the residual coal pillars in the overburden, the periodic pressure char- acteristic of the face is obvious. The pressure of working face during entering and leaving the pillars increases sudden- ly, and the peak pressure of the coal pillars for leaving pillars is 1.5 times that of for entering. The peak working re- sistance of the front leg during entering is 1.86 times that of the back leg, the resistance peak for front leg is 0.45 times that of the back leg during leaving the coal pillar. The results of this study have certain reference for the re- search on the law of strata behavior under the similar conditions.