综放开采超前平巷中奇异矿压显现规律

针对兴隆庄煤矿一采区1303综放工作面超前平巷发生奇异压力的现象，采用关键层理论对在采动过程中的上覆岩层运动规律进行了详细的力学分析，研究了它们的运动特征、破断步距、断裂位置、断裂方式以及对工作面及其超前平巷的来压规律，对比分析了该工作面矿压实测数据与理论研究成果.结果表明，1#顶板岩层对工作面及超前平巷压力影响都很小，2#顶板岩层主要影响工作面矿压显现，而对超前平巷影响较小，3#顶板岩层对工作面压力影响较小而对超前平巷的矿压显现有较大的影响.放顶煤开采增大了3#顶板的运动空间，超前平巷的矿压显现具有周期性.1303综放工作面超前平巷发生的奇异压力现象是3#顶板和2#顶板岩层共同来压作用的结果.

Analysis of Abnormal Strata Behavior in the Advance Entry with Fully-Mechanized Top-Coal Caving

Aiming at the abnormal strata behavior in the advance entry of 1303 fully-mechanized working face in Xinglongzhuang coal mine,the movement rule,characteristic,step distance of fracturing,position and mode of fracturing of the overlying strata in mining process is analyzed by using the key strata theory.In addition,the effect of these factors on weighting rule of working face and advance entry is also analyzed,and the measured weighting values are compared with theoretical analysis.The result shows that 1) the effect of 1# roof on both the working face and the advance entry is very small,2) the 2# roof has a great effect on working face and a few effect on the advance entry,and 3) the 3# roof has a great effect on the advance entry and a few effect on working face.the top coal caving increase the space of the 3# roof,making the weighting of the advance entry have a periodic characteristic.Therefore,the abnormal strata behavior happened in the advance entry is the result of common action of 3# and 2# roofs.