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Dynamic Damage Mechanism of Coal Wall in Deep Longwall Face

机译：深层长墙面煤墙动态损伤机理

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摘要

The stability of coal wall in deep longwall face has always been a research hotspot. In this study, pure vibration signals in the coal wall during the operation of mining machinery were obtained for the first time, and their energy is mainly concentrated in 7-12 Hz. Besides, based on the law of stress wave propagation, with the coal wall of deep longwall taken as the research object, the theory of dynamic damage in coal wall was put forward from the perspective of dynamics. The results show that the loading and unloading waves generated by the mining machinery disturbance will be reflected and transmitted at the interface with different impedances, resulting in the formation of multiple unloading and loading waves and multiple tensile stress zones and stress concentration zones. These stress concentration zones tend to induce tensile stress generation and coal failure. As a result, the coal undergoes zonal failure and spalling. Through the vibration test of coal, it is found that the crack development of the coal sample can be divided into five stages, and the phenomena of zonal failure and spalling occur, which is consistent with the theory. At the same time, the sample that has gone through a large disturbance cannot be further damaged by a small disturbance, which is verified by the damage statistical constitutive model based on the isotropy hypothesis.
机译：深层长墙面煤墙的稳定性一直是研究热点。在该研究中，首次获得矿工机械操作期间煤墙中的纯振动信号，其能量主要集中在7-12 Hz。此外，基于应力波传播的规律，随着煤墙作为研究对象，从动力学的角度提出了煤墙的动态损坏理论。结果表明，由采矿机械干扰产生的装载和卸载将在具有不同阻抗的界面上反射和传输，从而形成多重卸载和加载波和多重拉伸应力区域和应力集中区域。这些应力集中区倾向于诱导拉伸应力产生和煤衰竭。结果，煤炭经历了危险衰竭和剥落。通过煤的振动试验，发现煤样的裂纹开发可分为五个阶段，并且发生了区间失效和剥落现象，这与理论一致。同时，通过大扰动的样品不能通过小扰动进一步损坏，这是基于各向同性假设的损伤统计本构模型验证。

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  • 来源
    《Advances in civil engineering》 |2019年第16期|3105017.1-3105017.10|共10页
  • 作者

    Lu Shuaifeng; Liu Sifei; Wan Zhijun; Cheng Jingyi; Yang Zhuangzhuang; Shi Peng;

  • 作者单位

    Minist Educ China Key Lab Deep Coal Resource Min CUMT Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    Minist Educ China Key Lab Deep Coal Resource Min CUMT Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    Minist Educ China Key Lab Deep Coal Resource Min CUMT Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    Minist Educ China Key Lab Deep Coal Resource Min CUMT Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    Minist Educ China Key Lab Deep Coal Resource Min CUMT Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

    Minist Educ China Key Lab Deep Coal Resource Min CUMT Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Xuzhou 221116 Jiangsu Peoples R China;

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