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首页> 外文期刊>Environmental Geology >Numerical simulation and experimental study on floor failure mechanism of typical working face in thick coal seam in Chenghe mining area of Weibei, China
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Numerical simulation and experimental study on floor failure mechanism of typical working face in thick coal seam in Chenghe mining area of Weibei, China

机译：渭北澄河矿区厚煤层典型工作面底板破坏机理的数值模拟与试验研究

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摘要

The hydrogeological conditions of Weibei coalfield in China are complex; the main mining No. 5 coal seam is seriously threatened by Ordovician limestone karst water disaster at the bottom of coal measures. Chenghe No. 2 Mine is a typical example. With the increase of mining depth, confined water pressure increases year by year. To find out the law of floor deformation and failure caused by No. 5 coal seam mining in Chenghe No. 2 Coal Mine, this paper takes 24,508 working face of Chenghe No. 2 Coal Mine as engineering geological background, and carries out research by numerical simulation and field test methods. The stress field, displacement field distribution law and plastic zone evolution characteristics of No. 5 coal seam roof and floor varying with the advancing degree of mining face are obtained by simulation calculation. The progressive failure process of the whole floor stratum is reproduced dynamically, and the development height of the water conducting fracture zone of overburden is given. The maximum failure depth of the floor occurs at the mining distance of about 1.5 times the mining width, at which time "the saddle shape" supporting pressure arch reaches its maximum. At the same time, the multi-point separated layer displacement meter is used to carry out field measurements. The results show that the maximum failure depth of floor occurs in the goaf, and the maximum range of the relative displacement of the floor is 8.0-8.5 m, which is close to - 6.1 m from the coal mining surface, consistent with the results of the numerical simulation. Comprehensive analysis shows that the maximum failure depth of coal seam floor in Chenghe No. 2 Coal Mine is 8.3 m. The conclusion provides a favorable basis for the rational formulation of water disaster control countermeasures. It provides reference and experience for mining under safe water pressure of aquifuge for prevention and cure water of similar working face in Chenghe mining area in the future.
机译：中国渭北煤田的水文地质条件复杂。煤层底部的奥陶系石灰岩岩溶水灾害严重威胁了主要的第5煤层开采。澄河二号矿就是一个典型的例子。随着开采深度的增加，承压水压力逐年增加。为找出澄河二煤矿五号煤层开采引起的底板变形和破坏规律，以澄河二煤矿24508工作面为工程地质背景，并进行数值研究。模拟和现场测试方法。通过模拟计算，得出了5号煤层顶板，底板的应力场，位移场分布规律及塑性区演化特征。动态再现了整个地层的渐进破坏过程，并给出了覆盖层导水裂缝带的发育高度。底板的最大破坏深度出现在开采宽度的1.5倍的开采距离处，此时支撑压力拱的“鞍形”达到最大。同时，使用多点分离层位移计进行现场测量。结果表明，采空区底板最大破坏深度发生，底板相对位移的最大范围为8.0-8.5 m，距采煤面接近-6.1 m，与试验结果相吻合。数值模拟。综合分析表明，澄河二煤矿煤层底板最大破坏深度为8.3 m。结论为合理制定水灾防治对策提供了有利依据。为今后在成河矿区类似工作面水的防治中，在含水层安全水压下开采提供参考和经验。

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  • 来源
    《Environmental Geology》 |2020年第5期|118.1-118.22|共22页
  • 作者

    Li Ang; Ma Qiang; Lian Yanqing; Ma Li; Mu Qian; Chen Jianbo;

  • 作者单位

    Xian Univ Sci & Technol Sch Architecture & Civil Engn Xian 710054 Shaanxi Peoples R China|Minist Land & Resources Key Lab Coal Resources Explorat & Comprehens Util Xian 710021 Shaanxi Peoples R China;

    Chinese Acad Sci Inst Earth Environm Key Lab Loess & Quaternary Geol 97 Yanxiang Rd Xian 710061 Shaanxi Peoples R China|Univ Illinois Prairie Res Inst 2204 Griffith Dr Champaign IL 61820 USA;

    Minist Land & Resources Key Lab Coal Resources Explorat & Comprehens Util Xian 710021 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Sch Architecture & Civil Engn Xian 710054 Shaanxi Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Chenghe mining area; No; 5 coal seam; Mining under safe water pressure of aquifer; Floor failure depth; Numerical simulation;

    机译：澄河矿区;没有;5煤层;在含水层的安全水压下开采;地板破坏深度;数值模拟;

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