Shaanxi Shanmei Hancheng Mining Co., Ltd.

近距离煤层采空区下回采巷道合理错距的确定对巷道安全高效掘进意义重大。以下峪口煤矿为工程背景,采用理论分析及现场试验的方法,对23306下进顺采空区下回采巷道合理错距进行研究。得出下峪口煤矿23306下进风顺槽合理留设错距为22m,根据23306下进顺错距留设情况提出支护方案并根据巷道顶底板及两帮位移变化情况进行监测验证,监测发现巷道各测点顶底板及两帮的移近量均小于450mm,大多时间内两帮的移近量小于350mm,煤柱帮的深基点和浅基点的位移变化量基本一致,且随着巷道的掘进,未出现较大变形,说明采用22m错距可实现围岩变形稳定,研究可为类似条件巷道安全高效生产提供经验和参考。

great significance for the safe and efficient tunneling of the roadway. Xiayukou Coal Mine is taken as the engineering back-ground, and the reasonable staggered distance of the 23306 lower mining roadway is studied using the methods of theoreticalanalysis and field test. It is concluded that the reasonable staggering distance of the 23306 lower air inlet way in XiayukouCoal Mine is 22 m, and the support scheme is proposed according to the retention of the 23306 lower inlet staggered dis-tance, and the monitoring and verification are carried out according to the displacement change of the roof and floor of theroadway and the two sides, and the monitoring finds that the narrowing of the roof and floor and the two sides of each meas-uring point of the roadway is less than 450 mm, and the narrowing of the two sides is less than 350 mm in most of the time,and the displacement changes of the deep base point and the shallow base point of the coal pillar sides are basically thesame, and with the excavation of the roadway, there is no large deformation, showing that the deformation stability of the sur-rounding rock can be achieved using the 22 m staggered distance. The study provides reference for the safe and efficient pro-duction of mines under similar conditions.