锦界煤矿31301工作面导水裂缝带发育高度研究

Research on the development height of water conducting fracture zones in the 31301 working face of Jinjie Coal Mine

利用理论分析、数值模拟、钻孔漏失量实测和钻孔窥视,查明锦界煤矿31301工作面顶板覆岩破坏规律。通过理论公式和经验公式计算,初步预测导水裂缝带的发育高度为30.6~49.6 m;运用UDEC模拟软件对锦界煤矿31301工作面开采过程中导水裂隙扩展规律进行模拟分析,31301工作面开采后导水裂缝带发育高度为52~55 m;采用钻孔漏失液观测法、钻孔窥视,现场实测31301工作面采动覆岩“两带”发育高度,得出31301工作面开采后导水裂缝带最大高度为59.3 m,裂采比为19.1,垮落带最大高度为9.3 m,垮采比为3。

By utilizing theoretical analysis,numerical simulation,actual measurement of drilling leakage,and drilling observation,the failure law of the rock roof of the 31301 working face in Jinjie Coal Mine is identified.Based upon the calculation of theoretical and empirical formulas,the development height of the water conducting fracture zone is preliminarily predicted to be 30.6-49.6 meters.Using UDEC simulation software to simulate and analyze the propagation law of water conducting fractures during the mining process of the 31301 working face in Jinjie Coal Mine,the height of the water conducting fracture zone after mining in the 31301 working face is 52-55 meters,and using the drilling leakage observation method and drilling observation,the development height of the"two zones"of the rock roof in the 31301 working face is measured on site,it is found that the maximum height of the water conducting fracture zone after mining in the 31301 working face is 59.3 m,the split mining ratio is 19.1,and the maximum height of the collapse zone is 9.3 m,and the collapse mining ratio is 3.