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通过对刘桥二矿452采区钻孔资料中的各项测试结果进行分析,探讨采空区煤层覆岩破坏情况,用钻孔确定垮落带及导水裂隙带的高度。
By analyzing the test results of drilling data in section 452 of Liuqiao No.2 mine, the destruction of overburden strata in the coal mined area is discussed, and the height of caving zone and water-conducting fracture zone is determined by drilling.