摘要:
为研究近直立巨厚煤层开采覆岩活动规律,指导近直立巨厚煤层开采实践及支架选型,基于相似材料物理模拟试验,建立了覆岩呈散体结构的"支架-围岩"相互作用力学模型,得到支架工作阻力的计算式。研究结果表明:在大尺寸开采空间和多次分层重复扰动影响下,覆岩块体将呈现"散体"结构状;工作面支架所承受的载荷为上覆岩层自然平衡拱内松散岩体自重,支架的支护阻力不仅与支架宽度、控顶距及松散岩体抗压强度有关,还与工作面长度相关,且随着煤层工作面长度的增加呈线性增加。结合工程实例,验证了理论推导的合理性,研究成果对于分析近直立巨厚煤层的支架工作阻力,合理选择支架具有重要的工程意义。
Abstract:
In order to analyze the movement laws of overlying strata in suberect and extra-thick coal seam mining, and provide basis for its engineering practice and selection of hydraul ic support, based on the physical simulation experiment of similar materials, the authors built the mechanical model of rock-support interaction characteristics with bulk structure of overlying strata to obtain the calculation formula of working resistances of support.The studies show that the overlying strata will be bulk structure under the conditions of large-scale mining space and repeated mining disturbance, and hydraulic support load is the dead weight of loosen rock mass in the natural equilibrium arch of overlying strata. The hydraulic support resistance is not only cIosely related to the width, roof distance of hydraulic support, and the compressive strength of loosen rock mass, but also to the length of working face, and the hydraulic support resistance increases with the increase of the working face length. The rationality of the theoretical derivation is verified by engineering example, and the research results could provide great significance to the analysis of support resistance and the reasonable selection of support types in suberect and extra-thick coal seam mining.
百度学术
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