【摘要】 无煤柱自成巷工法是一种在工作面开采过程中无煤柱留设、自动形成巷道的新型采煤方法。自成巷围岩稳定控制是新工法成功应用的关键，主要利用支顶护帮结构控制自成巷顶板与采空区矸石帮变形。为实现自成巷围岩的稳定控制，本文建立了无煤柱自成巷支顶护帮结构力学模型，推导了支顶护帮结构的组合受力计算公式，揭示了自成巷参数对支顶护帮结构受力的影响机制。在此基础上，提出了轻型约束混凝土支顶护帮支护技术，并以现场常用U型钢、轻型与普通约束混凝土支护结构为研究对象，开展了不同偏心距下的力学试验。结果表明，轻型与普通约束混凝土试件的承载性能基本一致；不同偏心距下约束混凝土试件的极限承载力不低于U型钢试件的1.95倍。通过对试验结果与约束混凝土理论计算结果进行对比分析，建立了轻型约束混凝土支顶护帮结构设计方法，并在特大型矿井柠条塔煤矿进行了成功应用。更多还原

【Abstract】 Non-pillar mining technology with automatically formed roadway is a new mining method without coal pillar reservation and roadway excavation. The stability control of automatically formed roadway is the key to the successful application of the new method. In order to realize the stability control of the roadway surrounding rock, the mechanical model of the roof and rib support structure is established, and the influence mechanism of the automatically formed roadway parameters on the compound force is revealed. On this basis, the roof and rib support structure technology of confined lightweight concrete is proposed, and its mechanical tests under different eccentricity are carried out. The results show that the bearing capacity of confined lightweight concrete specimens is basically the same as that of ordinary confined concrete specimens. The bearing capacity of confined lightweight concrete specimens under different eccentricities is 1.95 times higher than those of U-shaped steel specimens. By comparing the test results with the theoretical calculated results of the confined concrete, the calculation method of the bearing capacity for the confined lightweight concrete structure is selected. The design method of confined lightweight concrete support structure is established, and is successfully applied in the extra-large mine, Ningtiaota Coal Mine, China.更多还原