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首页> 外文期刊>Advances in civil engineering >Mechanical Modeling of Roof Fracture Instability Mechanism and Its Control in Top-Coal Caving Mining under Thin Topsoil of Shallow Coal Seam
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Mechanical Modeling of Roof Fracture Instability Mechanism and Its Control in Top-Coal Caving Mining under Thin Topsoil of Shallow Coal Seam

机译：浅埋煤层薄壁岩岩骨折不稳定机制及其对顶煤矿井的控制

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摘要

This study aimed to explore the safe and efficient top-coal caving mining under thin topsoil of shallow coal seam (SCS) and realize the optimization of hydraulic support. Numerical simulation and theoretical analysis were used to reveal the stress distribution of the topsoil, the structure characteristics of the main roof blocks, and the development of the roof subsidence convergence. Step subsidence of the initial fractured main roof after sliding destabilization frequently existed, which seriously threatened the safety of the hydraulic supports. Hence, a mechanical model of the main roof blocks, where the topsoil thickness was less than the minimum height of the unloading arch, was established, and the mechanical criterion of the stability was achieved. The working resistance of the hydraulic support was calculated, and the reasonable type was optimized so as to avoid crushing accident. Findings of the present analysis indicated that the hydraulic support optimization was mainly affected by fractured main roof blocks during the first weighting. According to the block stability mechanical model based on Mohr-Coulomb criterion, the required working resistance and the supporting intensity were determined as 4899 kN and 0.58 MPa, respectively. The ZZF5200/19/32S low-position top-coal caving hydraulic support was selected for the studied mine and support-surrounding rock stability control of thin-topsoil SCS could be achieved without crushing accident.
机译：本研究旨在探讨浅层煤层（SCS）薄的薄壁上安全有效的顶煤矿山，并实现了液压支撑的优化。使用数值模拟和理论分析来揭示表土的应力分布，主屋顶块的结构特性，以及屋顶沉降收敛的发展。初始断裂主屋顶的步进沉降在滑动稳定之后经常存在，这严重威胁了液压支架的安全性。因此，建立了主屋顶块的机械模型，其中厚度小于卸载拱的最小高度，并且实现了稳定性的机械标准。计算液压支撑件的锻炼性能，合理的型优化，以避免破碎事故。目前分析的结果表明，液压支撑优化主要受到第一加权期间的断裂主屋顶块的影响。根据基于MoHR-Coulomb标准的块稳定性机械模型，分别确定所需的工用电阻和支撑强度分别为4899kN和0.58MPa。选择ZZF5200 / 19/32S低位顶煤落液液压载体为学习矿山，可以在不破碎事故的情况下实现薄皮上的SCS的围绕岩石稳定性控制。

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  • 来源
    《Advances in civil engineering》 |2019年第14期|1986050.1-1986050.10|共10页
  • 作者

    Gong Peilin; Zhao Tong; Yetilmezsoy Kaan; Yi Kang;

  • 作者单位

    Taiyuan Univ Technol Coll Min Technol Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Key Lab In Situ Modified Min Minist Educ Taiyuan 030024 Shanxi Peoples R China;

    Yildiz Tech Univ Dept Environm Engn Fac Civil Engn Davutpasa Campus TR-34220 Istanbul Turkey;

    China Univ Min & Technol Sch Energy & Min Engn Beijing 100083 Peoples R China;

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  • 正文语种 eng
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