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中文摘要：
晋城矿区15#煤直接顶K2石灰岩厚8～12m,结构致密坚硬,为坚硬难垮落顶板。针对厚层石灰岩顶板可能面临的大面积断裂和垮落,从而导致冲击地压等问题,通过岩石力学性质试验获得相关岩层力学参数,并运用关键层理论、数值模拟和相似材料模型试验,研究了厚层脆韧性石灰岩顶板的变形与垮落特性,得到了顶板初次来压步距20～25m和周期来压步距10～15m及垮落规律,并提出了顶板控制的技术途径,即初期中深孔爆破结合顶板关键层缓慢下沉综合控制技术。实践表明,厚层石灰岩顶板的垮落形态和垮落步距与理论和试验研究结果基本一致。该项成果为晋城矿区厚层脆韧性石灰岩顶板控制提供了有效途径。
英文摘要：
The K2 Limestone Immediate Roof of 15# coal seam in Jincheng mining area is 8-10 m in thickness. Such roof structure,which is dense and hard,belongs to strong and difficult collapse roof. Aiming at the thick limestone roof being possible to face with the large area roof fracture and collapse accident,and based on some mechanical parameters obtained from the rock mechanical test,the deformation and collapse characteristics of brittle-ductile thick limestone roof were analyzed by using key strata theory and synthetically researched by numerical simulation and similar material simulation,obtaining the first weighting step distance,periodic weighting step distance,and the collapse rules of such roof. The researches had similar results that the first weighting step distance is 20-25m and the periodic weighting step distance is 10-15 m. The actual mining practice indicated that the theoretical results are in good agreement with that of experiment on collapse characteristics and weighting step distance of thick limestone roof. Therefore,the research result has provided effective way and method to the research and control of the deformation and collapse characteristics of brittle-ductile thick limestone roof in Jincheng mining area.
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