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以寺河二号井为试验矿井,采用钻孔双栓塞封堵分段注水试验装置与钻孔电视观测系统,探测一次采全高覆岩冒落带发育高度,对裂隙倾角分布特征、数量与宽度、深度与宽度、数量与深度关系进行数字化分析,并就裂隙演变特征进行数值模拟试验。数据分析结果表明:寺河二号井一次采全高综采冒落带发育高度为4.1~4.8 m;随着工作面的推进覆岩裂隙数量直线上升,且以中宽度、小角度裂隙为主;采动过程中裂隙主要聚集在近煤壁区域;覆岩裂隙密度分布曲线呈“蛇”型。
Taking Sihe No.2 well as a pilot mine, a double plug embankment was used to plug the subsection water injection test equipment and the drilling television observation system to detect the development height of the caving zone of the fully overburdened rock. The distribution characteristics of fracture inclination angle, quantity and width , The depth and width, the number and the depth of the relationship between the digital analysis, and evolution characteristics of fissures for numerical simulation. The results of data analysis show that the developed height of the fully-mechanized mining-induced caving zone of the No. 1 coal mine at the time of mining is 4.1-4.8 m. With the advancement of the working face, the number of the cracks in the strata rises linearly and mainly takes the medium-width and small-angle fractures. During the mining process, the fissures mainly gathered in the near coal wall area; the distribution curve of the crevice crack density in the overburden rock showed a “snake” type.