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以潞安矿区司马煤矿薄基岩综放开采为背景,采用现场实测、数值模拟、理论分析相结合的方法,研究了薄基岩综放采场支架-围岩关系,得到了薄基岩条件下综放采场的支架工作阻力和顶板下沉量关系曲线,并给出了薄基岩综放开采支架工作阻力计算方法。研究结果表明:薄基岩综放开采的支承压力影响范围远小于厚基岩开采;支架工作阻力和顶板下沉量仍然满足类双曲线关系;顶煤在高围压作用下,“垫层”效应降低,呈现出“似刚性体”特征,基本顶“给定变形”压力能够有效地传递至支架,造成较高支架工作阻力。该研究成果合理解释了薄基岩综放采场来压显现强烈、支架工作阻力大于厚基岩的现象,为薄基岩综放开采支架合理选型提供了依据。
Taking the fully mechanized caving mining of thin bedrock in Sima Coal Mine, Lu’an Mining Area as the background, the relationship between the support and surrounding rock of fully mechanized caving mining face with thin bedrock was studied by field measurement, numerical simulation and theoretical analysis. The relationship between the working resistance of the support and the subsidence of the roof in the fully mechanized sublevel caving face and the calculating method of working resistance of the fully mechanized top coal caving mining face with the fully mechanized top coal caving are given. The results show that the influence range of supporting pressure on fully mechanized top-coal caving mining of thin bedrock is much less than that of thick bedrock mining. The working resistance and roof subsidence still satisfy hyperbolic relations. Under the condition of high confining pressure, The effect is reduced, showing a “rigid body like” character, with a basic top “given deformation” pressure that can be effectively transmitted to the stent resulting in a higher stent working resistance. The research results reasonably explain the strong pressure of the fully mechanized top-coal caving face in thin bedrock and the fact that the working resistance of the support is greater than that of the thick bedrocks, which provides the basis for the reasonable selection of the supports for the fully mechanized top coal caving mining in thin bedrock.