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<p>Large deformation of deep fractured rock mass around roadways has caused great challenges for underground mining activities. Based on the field monitoring data from Jinchuan No. 2 Mine, the proposed Voronoi grain-based breakable block model (VGBBM) and discrete fracture network (DFN) were used to study the deformation failure mechanism of layered and fractured rock masses. Moreover, the rockbolt element and solid element were added to investigate the reinforcement effects. The results reveal that roof collapse and floor heave are the typical failure modes. The structural plane spacing and dip angle significantly influence the positions of stress relief zones and the formation of pressure arches, which results in deformation anisotropy and fracture heterogeneity. Rockbolts and linings can effectively inhibit the development of roof collapse zones and limit the displacement of top arches but cannot effectively inhibit floor heave.</p>

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Deformation failure mechanism and support effect in deep fractured rock masses

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Shirui Zhang,
  • Shili Qiu,
  • Quan Jiang,
  • Yongyuan Kou,
  • Hao Zhang,
  • Zhenkun Xie

摘要

Large deformation of deep fractured rock mass around roadways has caused great challenges for underground mining activities. Based on the field monitoring data from Jinchuan No. 2 Mine, the proposed Voronoi grain-based breakable block model (VGBBM) and discrete fracture network (DFN) were used to study the deformation failure mechanism of layered and fractured rock masses. Moreover, the rockbolt element and solid element were added to investigate the reinforcement effects. The results reveal that roof collapse and floor heave are the typical failure modes. The structural plane spacing and dip angle significantly influence the positions of stress relief zones and the formation of pressure arches, which results in deformation anisotropy and fracture heterogeneity. Rockbolts and linings can effectively inhibit the development of roof collapse zones and limit the displacement of top arches but cannot effectively inhibit floor heave.