Evolution and control technology of energy aggregation and dissipation of a high hard roof during breakage and destabilization

IF 2.2 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Fracture Pub Date : 2023-11-02 DOI:10.1007/s10704-023-00745-4

Yong Li, Yang Tai, Bin Yu, Tiejun Kuang, Rui Gao, Junyu Liu

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Abstract

The focus of this study was prevented disasters caused by the breaking of high hard roofs (HHRs) in mines. A model of the mining load-bearing capacity of a HHR cantilever beam structure (HHRCBS) was developed based on elastic foundation beam theory. The evolution of mining load-bearing capacity and energy aggregation and dissipation in HHRs were analyzed. Additionally, the dynamic working resistance experienced by hydraulic supports was quantitatively decomposed from an energy perspective. The findings indicated that (1) during mining operations, the pressure and strength of the working face were primarily governed by the stability of the HHRCBS. (2) The cantilever length significantly influenced the evolution of mining load-bearing capacity and energy aggregation and dissipation in the HHR. By reducing the length of the cantilever beam in the HHR, the effects of roof breakage on the cantilever beam structure were significantly decreased. (3) The dynamic load of the overburden and the energy released by the breakage of the HHR corresponded to 7536.1 kN, while the static load generated by the breaking of low rock blocks was 8348.3 kN. We then analyzed an integrated surface control technology for HHRs and conducted a field test in the Datong Mining District. The measured dynamic working resistance showed that the proposed integrated surface control technology could effectively prevent strong pressure during mining.

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高硬度屋顶在破损和失稳时能量聚集和消散的演变与控制技术

本研究的重点是预防矿山高硬顶板（HHR）破碎造成的灾害。根据弹性地基梁理论，建立了高硬度顶板悬臂梁结构（HHRCBS）的采矿承载力模型。分析了矿山承载力的演变以及 HHR 的能量聚集和耗散。此外，还从能量角度对液压支架承受的动态工作阻力进行了定量分解。研究结果表明：（1）在采矿作业过程中，工作面的压力和强度主要受 HHRCBS 稳定性的影响。(2) 悬臂长度对采矿承载能力的演变以及 HHR 中能量的聚集和耗散有显著影响。通过减小高炉炉膛悬臂梁的长度，可明显降低顶板破碎对悬臂梁结构的影响。(3) 覆盖层的动荷载和 HHR 破裂释放的能量对应为 7536.1 kN，而低岩块破裂产生的静荷载为 8348.3 kN。随后，我们分析了 HHR 的综合表面控制技术，并在大同矿区进行了现场试验。测得的动态工作阻力表明，所提出的综合表面控制技术可有效防止采矿过程中的强压力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Fracture 物理-材料科学：综合

CiteScore

4.80

自引率

8.00%

发文量

审稿时长

13.5 months

期刊介绍： The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications. The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged. In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.