School of Mining Engineering, Anhui University of Science and Technology

针对近距煤层合层综放开采覆岩移动破坏与矿压显现规律等问题,以涡北煤矿842首采综放工作面为工程背景,采用相似模拟试验和数值分析手段对工作面开采过程进行研究。结果表明:相似模拟试验下覆岩冒落带高度为38m,开切眼附近裂隙带的高度为103.8m,停采线附近裂隙带的高度为95.4m,基本顶初次来压步距为28m,周期来压步距为17.5m。由数值分析得到采场围岩位移场与应力场的变化颇为相似,分析采场前方支承压力分布特征与相似模拟试验的结果相吻合。研究结果可为近距煤层合层综放工作面煤柱宽度、工作面支护参数设计提供技术指导。

Aiming at issues such as the movement and damage of overlying strata and the law of mine pressure behavior in close distance coal seam laminated layer fully mechanized caving mining and so on, taking the 842 first fully mechanized caving face in Wobei Coal Mine as the engineering background, similar simulation experiments and numerical analysis methods are used to study the working face mining process. The results show that under similar simulation experiments, the height of the overlying rock caving zone is 38 m, the height of the fissure zone near the open cut is 103.8 m, the height of the fissure zone near the stop mining line is 95.4 m, the initial pressure step distance of the basic roof is 28 m, and the periodic pressure step distance is 17.5 m. The numerical analysis shows that the displacement field and stress field of the surrounding rock in the stope are quite similar, and the distribution characteristics of the support pressure in front of the stope are consistent with the results of similar simulation experiments. The research results can provide technical guidance for the design of coal pillar width and working face support parameters in close distance coal seam laminated layer fully mechanized caving face.