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Directional Sharp-Point Failure Mechanism of Rocks Surrounding Underground Circular Cavities Subjected to Large-Scale Failure

机译：大范围破坏作用下地下圆形洞室围岩定向尖点破坏机理

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摘要

Large-scale expansion of failure areas in rocks surrounding underground cavities causes severe destruction of the underground space and may trigger serious disasters. To study the large-scale failure mechanism and expansion laws of rocks surrounding underground cavities, we performed a theoretical study of the distribution characteristics of the stress field around a circular cavity and determined the directional sharp-point failure mechanism by analysing the stress destructive power using the three elements of the Mohr circle. Results showed that, along the circumferential direction, the stress destructive power increases first and then decreases, showing a sharp-angular distribution. Rock with any properties will suffer priority damage at the stress sharp point. The direction criterion of the stress sharp points was proposed, and the direction of these points showed a convergent behaviour in the radial direction of the cavity, tending to be stable at 40 degrees-50 degrees beyond five times the cavity radius. In addition, the results were verified by FLAC3D numerical simulation. The theoretical analysis for the ideal circular cavity may provide references to study the damage laws of rocks surrounding other irregular-shaped space, as well as providing a theoretical basis for the prevention and control of underground engineering disasters.
机译：地下洞室周围岩石中破坏区域的大规模扩张会严重破坏地下空间，并可能引发严重的灾难。为了研究地下空腔周围岩石的大型破坏机理和膨胀规律，我们对圆形空腔周围应力场的分布特征进行了理论研究，并通过使用应力破坏力分析确定了方向性的尖点破坏机理。莫尔圆的三个元素。结果表明，沿圆周方向，应力破坏力先增大，然后减小，呈锐角分布。具有任何特性的岩石将在应力尖峰时遭受优先破坏。提出了应力尖点的方向判据，这些尖点的方向在模腔的径向呈收敛性，在模腔半径的五倍以上的40度至50度范围内趋于稳定。此外，结果通过FLAC3D数值模拟得到了验证。理想圆形空腔的理论分析可为研究其他不规则空间周围岩石的破坏规律提供参考，为地下工程灾害的防治提供理论依据。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第5期|1415387.1-1415387.19|共19页
  • 作者

    Guo Xiao-fei; Zhao Zhiqiang; Gao Xu; Ma Zhen-kai; Ma Nian-jie;

  • 作者单位

    China Univ Min & Technol Beijing, Fac Resource & Safety Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol Beijing, Fac Resource & Safety Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol Beijing, Fac Resource & Safety Engn, Beijing 100083, Peoples R China;

    Liaoning Tech Univ, Coll Min Engn, Fuxing 123000, Liaoning, Peoples R China;

    China Univ Min & Technol Beijing, Fac Resource & Safety Engn, Beijing 100083, Peoples R China;

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