Tangshan Branch of China Coal Group of Technology and Engineering

为了研究潞安矿区不同开采工艺对导水裂隙带发育高度的影响规律,通过地面施工20余个勘探钻孔,采用水文观测、注水试验等综合手段,对采空区顶板岩层裂隙分布进行了探测研究。通过对大量实测数据的统计分析,研究了导水裂隙带高度与开采高度以及分层数的关系,对比分析了不同开采工艺裂隙带发育规律。结果表明:相同煤层条件下综放开采工艺裂隙带最为发育,分2层综采工艺裂隙带高度与综放开采相比降低了24%,但综放开采裂采比与初分层开采裂采比基本一致,裂采比值约为20,并得到了潞安矿区裂隙带高度计算经验公式,确定了该矿区水体下采煤的原则性方案。在五阳煤矿漳河下厚煤层综放开采的成功实施,验证了研究结果的可靠性。

In order to study development rule of water conducted zone caused by different mining technologies in Lu'an mining area, roof fracture distribution was s tudied by drilling 20 boreholes on ground and by using hydrological observation and water injection test. Statistical analysis was done based on large numbers of in-site data, for studying relationship between height of fractured zone with mining height and slicing, developing laws of fractured zones with different mining technology were compared and analyzed. The results showed that, the height of fractured zone by fully-mechanized top coal caving was much more higher than other mining ways. The height of fractured zone with two slicing mining had reduced by 24% than that with fully-mechanized top coal caving. The ratio of height of fractured zone to the mining height by caving was basically same as that of primary recovery by slicing, the value was 20. The empirical formula was provided for calculating height of fractured zon e in Lu'an mining district, and the basic scheme of mining under water body was determined. The research had been successfully used for mining under Zhanghe river i n Wuyang Coal Mine, which has verified the relability of studying results.