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为了揭示上薄下厚近距离煤层同采覆岩破断结构特征,保障下位厚煤层顶板的稳定,本文根据泉店煤矿东翼11采区首采面的近距离煤层群地质赋存条件,采用相似模拟研究了上薄下厚近距离煤层群同采覆岩破断规律,进而分析了下位厚煤层覆岩在开采影响范围从上到下是由断裂块体、破碎体、破裂体、较完整岩层等不同介质组成的,建立了上薄下厚近距离煤层群同采支架-围岩关系模型,揭示了其相互作用体系由支架-组合悬梁结构-松散结构-铰接顶板结构组成,推导出支架工作阻力的计算公式。实例计算了泉店煤矿二1-11070综放工作面支架的支护阻力,为支架选型提供理论依据,并现场实测了支架阻力,实测结果与理论计算结果较为接近,该理论可为类似条件下的顶板控制提供参考。
In order to reveal the characteristics of the broken structure of the same mining seam with the upper and lower, lower and thick coal seam and to protect the stability of the roof of the lower thick coal seam, according to the geological storage conditions of the close coal seams in the first mining face of the 11th mining area in the east wing of Quandian Coal Mine, The authors studied the breaking rules of the same mining strata with the upper and lower, lower and thick coal seam groups in a simulation study, and then analyzed the influence of the overburden strata in the lower thick coal seam from the top to the bottom of the mining area by the fault blocks, crushed bodies, Different media, the model of the relationship between the coal mines and the surrounding rock of the coal mines with the lower thickest, the lower, the thick and the short distance has been established, and the interaction system has been established by the structure of the brackets-composite cantilever structure-loose structure-hinged roof, and the working resistance The formula. The example calculated the support resistance of the two 1-11070 fully mechanized top coal caving face support in Quandian Coal Mine and provided the theoretical basis for the selection of the support. The resistance of the support was measured on the spot. The measured results are close to the theoretical ones. Under the roof control for reference.