关键词: 近距离 回采巷道 薄顶板 破碎围岩 房柱式开采

Abstract: The distance between 5# coal seam and 4# coal seam in the upper part of Liulin Coal Mine is very small,the average thickness of the roof is 3.69 m,and the roof fluctuates greatly,the intensity is low,and it is easy to break,which makes it difficult to support the roadway.The supporting parameters of the roadway in the mining process of 5# coal seam are different from those in the general working face,so it is necessary to carry out targeted analysis.Based on this,through numerical simulation,the paper analyzes the deformation rule of surrounding rock under different roof bolt length,different bolt length,different bolt spacing and different bolt row distance under the condition that the overlying strata of 5# coal seam mining roadway are coal pillars and goaf.According to the numerical simulation results,considering the actual situation of the mining roadway,and based on the overall support structure of the roadway,the reasonable bolt support parameters of the 5# coal seam mining roadway are determined.

Key words: Short distance,Mining roadway, Thin roof, Broken surrounding rock, Room pillar mining