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首页> 外文期刊>Advances in civil engineering >Large-Deformation Failure Mechanism of Coal-Feeder Chamber and Construction of Wall-Mounted Coal Bunker in Underground Coal Mine with Soft, Swelling Floor Rocks
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Large-Deformation Failure Mechanism of Coal-Feeder Chamber and Construction of Wall-Mounted Coal Bunker in Underground Coal Mine with Soft, Swelling Floor Rocks

机译：煤料室的大变形故障机理和柔软，膨胀地岩地下煤矿壁挂式煤沙坑施工

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摘要

In traditional vertical coal bunker systems, a coal-feeder chamber (CFC) must bear the whole weight of the bunker. However, maintenance of CFCs within soft, swelling floor rock is a challenge faced in underground coal mines. Floor-heave control is a complex problem and is still not well-solved. Moreover, there is no report on the construction of bunker without a CFC, especially under such weak floor-rock conditions. Based on the serious CFC collapse case at Xiashijie mine, China, this work analyzed the deformation characteristics, main influencing factors, and failure mechanisms of the CFC using a FLAC numerical model. The results indicate that the intrusion of water weakens the strength of the floor rock and causes significant expansive forces; thus, large deformations and tensile failure occur first in the floor, further causing shearing and tensile damage of the reinforced column and even overall instability of the CFC. Then, a new wall-mounted coal bunker (WMCB), without building the CFC, is proposed. The FLAC3D program was adopted to study the stability of the rocks surrounding the new bunker, and an optimized reinforcement scheme was determined. More importantly, a self-bearing system, which includes self-designed H-steel beams, H-steel brackets, and self-locking anchor cables, was proposed and constructed to bear the whole weight of the bunker. The stability of WMCB was verified by a theoretical safety assessment and field test. The invented WMCB could remain stable in spite of severe floor heave. This work can provide helpful references for the construction of vertical bunkers without CFCs in coal mines with soft, swelling floor rocks.
机译：在传统的垂直煤炭堡垒系统中，煤送料室（CFC）必须承受堡垒的整体重量。然而，维持柔软，膨胀地板岩石内的氟氯化合物是地下煤矿面临的挑战。落地控制是一个复杂的问题，仍然没有很好的解决。此外，没有关于没有CFC的掩体建造的报告，特别是在这种弱楼层岩石条件下。基于中国Xiashijie Mine的严重碳氟氢化碳塌陷案，这项工作分析了使用FLAC数值模型的CFC的变形特征，主要影响因素和失效机制。结果表明，水的侵入削弱了地板岩石的强度，并导致显着的膨胀力;因此，在地板中首先发生大变形和拉伸失效，进一步引起增强柱的剪切和拉伸损伤，甚至是CFC的整体不稳定性。然后，提出了一种新的壁挂式煤沙坑（WMCB），而无需构建CFC。采用FLAC3D计划研究了新碉堡周围岩石的稳定性，并确定了优化的加固方案。更重要的是，提出了一种包括自行设计的H钢束，H钢支架和自锁锚固件的自轴承系统，并构造成承受掩体的整体重量。通过理论安全评估和现场测试验证了WMCB的稳定性。尽管严重升降，但发明的WMCB可能保持稳定。这项工作可以提供有用的参考，用于在没有煤矿中的煤矿中康复的垂直掩体的建造，具有柔软，膨胀的地板岩石。

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  • 来源
    《Advances in civil engineering》 |2019年第11期|6519189.1-6519189.16|共16页
  • 作者

    Wang Xingkai; Xie Wenbing; Bai Jianbiao; Jing Shengguo; Su Zhili;

  • 作者单位

    China Univ Min & Technol State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

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