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针对近距离煤层群开采中下煤层开采造成上覆煤层巷道失稳的问题,以岱庄煤矿3上煤层4319工作面主运平巷为例,分析了近采空区上覆煤层巷道失稳机理和过程。研究得出导致上覆煤层巷道失稳的原因是下煤层开采超前应力的影响,超前影响范围约40 m。并结合现场实际,对原巷道支护进行了重新设计。
Aiming at the problem of the instability of the overlying coal seam roadway caused by the mining of the middle and lower coal seams in the short distance coal seam grouping, taking the main transportation laneway of No. 4319 working face of No. 3 coal seam in Daizhuang Coal Mine as an example, the instability mechanism of the overlying coal seam roadway in the near gob area And process. The study shows that the cause of the instability of overlying coal seam roadway is the influence of the advanced stress in the lower coal seam mining, with an advance influence range of about 40 m. Combined with the actual site, the original roadway support was redesigned.