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为了研究近距离煤层采空区下回采巷道在回采期间矿压显现规律,对回采工作面巷道围岩结构、围岩变形和松动圈大小进行了现场监测。通过监测结果分析得出,煤柱帮主要由煤和少量泥岩组成,裂隙发育,破碎严重。顺槽两帮最大移近量为0.49 m,顶底板最大移近量为0.41 m。未受采动超前支承应力的影响前巷道松动圈最大为1.3 m,受影响后增加至2.2 m,工作面超前支承压力影响范围为30m。
In order to study the law of occurrence of underground pressure during the mining process, the surrounding rock structure, the deformation of surrounding rock and the size of loose ring were monitored on the site. According to the monitoring results, it is concluded that the coal pillar is mainly composed of coal and a small amount of mudstone, and the fractures are developed and broken severely. The maximum amount of the two approaches to the groove is 0.49 m, and the maximum displacement of the top floor and the bottom floor is 0.41 m. The maximum diameter of loose ring of front roadway without influence of mining lead stress is 1.3 m, and it increases to 2.2 m after impact. The influence range of working face advance support pressure is 30 m.