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分析了厚煤层综放工作面开切眼冒顶的原因，并用高水材料注浆充填技术固化了切眼顶板，同时起到了防止顶板煤层自然发火的作用。
The reason of open cut and fall roof in fully mechanized top coal caving mining face with thick coal seam is analyzed, and the cut roof is solidified by the high water material grouting and filling technique, meanwhile, it plays the role of preventing the spontaneous combustion of roof coal seam.