为研究复杂煤层群条件下覆岩裂隙的发育规律,对405工作面地面采空区钻井瓦斯抽放进行实测.根据瓦斯抽放体积分数确定裂隙活化区,结合模拟分析等手段,总结出覆岩采动裂隙演化规律.结果表明:回采巷道内侧垂直方向上30～40 m、水平方向上距回采巷道30～50 m、采空区距工作面30～80 m范围为裂隙较发育区域. In order to study the rule of the development of overlying strata fissures under the condition of complex coal seam group, the gas drainage in the gob of 405 working face was measured.According to the volume fraction of gas drainage to determine the active area of ​​fissure, combined with the simulation analysis, The results show that: the vertical direction of the mining roadway is 30-40 m, the horizontal direction is 30-50 m from the mining roadway, and the range of 30-80 m of the goaf from the working face is the more developed fracture zone.