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为了确定老虎台矿复杂巨厚煤层不同开采阶段,导水裂隙带及离层空间等覆岩破坏范围及其演化规律,以63005工作面所在区域为研究对象,采用EH-4大地电磁法,对研究区域水砂充填开采阶段和综采放顶煤开采阶段覆岩破坏高度分别进行探测,确定了覆岩破坏高度与采出厚度间的关系;分别采用理论计算和数值模拟方法对探测结果进行了验证.研究结果表明,63005工作面开采前,即水砂充填开采阶段,三分层顶板岩层破坏高度范围为120~170m;工作面开采后,即综采放顶煤开采阶段,相同区域破坏高度达到150~220m;无论在水砂充填开采阶段还是综采放顶煤开采阶段,老虎台矿复杂巨厚煤层覆岩破坏平均高度为等效采厚的7.4倍;63005工作面开采过后,F18断层的上下盘之间出现了离层结构.
In order to determine the scope and evolution of overburden rock failure in different mining stages, water-conducting fractures and delamination space in the complex huge thick seam of Laohutai Mine, taking the area of 63005 working face as the research object, EH-4 MT method In the research area, the water sand filling and mining stage and the overburden caving height in the stage of fully mechanized top coal caving mining are respectively explored to determine the relationship between the height of the overburden rock and the thickness of the coal mining. The theoretical and numerical methods are respectively used for the exploration results The results show that, before the mining of 63005 working face, that is, the water sand filling and mining stage, the trisection roof rock failure height ranged from 120 to 170m; after the mining face, that is, the fully mechanized top coal caving mining stage, the same area damage height Reaching 150 ~ 220m. The average height of overlying strata in the complex thick seam of Laohutai Mine is 7.4 times that of the equivalent mining thickness, no matter in the stage of water sand filling or fully mechanized top coal caving mining. After the mining of 63005 face, the F18 fault Between the upper and lower plate appeared from the layer structure.