Bearing mechanism of roof and rib support structure in automatically formed roadway and its support design method

IF 3.7 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Central South University Pub Date : 2024-08-13 DOI:10.1007/s11771-024-5678-4

Bei Jiang, Ming-zi Wang, Qi Wang, Zhong-xin Xin, Xue-yang Xing, Yu-song Deng, Liang-di Yao

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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.

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自动成型巷道顶板和肋板支护结构的支承机理及其支护设计方法

自动成巷无煤柱开采技术是一种无煤柱预留和巷道掘进的新型开采方法。自动成型巷道的稳定性控制是新方法成功应用的关键。为实现巷道围岩的稳定性控制，建立了顶板与肋板支护结构的力学模型，揭示了自动成巷参数对复合力的影响机理。在此基础上，提出了约束轻质混凝土顶板与肋板支护结构技术，并对其进行了不同偏心率下的力学试验。结果表明，约束轻质混凝土试件的承载力与普通约束混凝土试件基本相同。不同偏心率下约束轻质混凝土试件的承载力是 U 型钢试件的 1.95 倍。通过试验结果与约束混凝土理论计算结果的对比，筛选出约束轻质混凝土结构承载力的计算方法。建立了约束轻质混凝土支护结构的设计方法，并成功应用于中国特大型矿井宁条塔煤矿。

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来源期刊

Journal of Central South University METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.10

自引率

6.80%

发文量

242

审稿时长

2-4 weeks

期刊介绍： Focuses on the latest research achievements in mining and metallurgy Coverage spans across materials science and engineering, metallurgical science and engineering, mineral processing, geology and mining, chemical engineering, and mechanical, electronic and information engineering