Analysis of progressive collapse disaster and its anchoring effectiveness in jointed rock tunnel

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-08-08 DOI:10.1002/nag.3817

Chengcheng Zheng, Peng He, Gang Wang, Jie Hu, Feng Jiang, Zhiqiang Yan, Zhiyong Xiao, Zhenghu Ma

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引用次数: 0

Abstract

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.

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节理岩隧道渐进式坍塌灾害及其锚固效果分析

节理岩体结构分布和组合特征的复杂性和多变性，使得隧道围岩坍塌的响应机理各不相同，现有围岩失稳模式和螺栓支护方案缺乏系统研究。基于对节理岩体块系结构的数值模拟，对比分析了现有的螺栓支护理论，探讨了各自的应用范围。结合块体失稳的时空迁移规律，提出了一种新的节理岩隧道批量失稳模型，揭示了关键块体失稳后互锁块体系统坍塌的渐进式坍塌灾难演化机理，阐明了螺栓与块体系统结构的耦合机理及其锚固效果。最后，针对实际隧道工程，确定了围岩失稳批次，提出了相应的螺栓支护优化设计方案，取得了良好的支护效果。研究成果可为节理岩体隧道危岩落石和连锁坍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。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.