The complexity and variability of the structural distribution and combination characteristics of jointed rock masses make the response mechanism of tunnel rock collapse different, and there is a lack of systematic research on the existing perimeter rock instability mode and bolt support scheme. Based on numerical simulations of the block system structure of a nodular rock mass, the existing theory of bolt support is compared and analyzed to explore the scope of their respective applications. Combined with the spatial and temporal transport law of block instability, a new batch instability model of jointed rock tunnels is proposed, which reveals the progressive collapse catastrophe evolution mechanism of a collapsed interlocking block system after the instability of the key blocks and elucidates the coupling mechanism between the bolts and the block system structure as well as their anchoring effectiveness. Finally, for the actual tunnel project, the instability batches of the surrounding rock are identified, and the corresponding optimized design of the bolt support is presented, which has achieved good support effects. The research results can provide important theoretical guidance and practical engineering value for risk avoidance, disaster identification and targeted prevention and control of dangerous rock fall and chain collapse instability disasters in jointed rock body tunnels.

中文翻译：

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节理岩隧道连续塌方灾害及其锚固效果分析


节理岩体的结构分布和组合特征的复杂性和多变性使得隧道围岩崩塌的响应机制各异，而对现有周边围岩失稳模式和锚杆支护方案缺乏系统研究。通过对球状岩体块体体系结构的数值模拟，对现有锚杆支护理论进行比较分析，探讨其各自的适用范围。结合块体失稳的时空传递规律，提出节理岩体隧道批量失稳模型，揭示了关键块体失稳后倒塌连锁块体系统渐进式崩塌突变演化机制，阐明了耦合机制。螺栓与块系统结构之间及其锚固效果。最后针对实际隧道工程，识别了围岩失稳批次，并提出了相应的锚杆支护优化设计，取得了良好的支护效果。研究成果可为节理岩体隧道危岩崩落及链式崩塌失稳灾害的风险规避、灾害识别和针对性防治提供重要的理论指导和工程实用价值。