Study on the instability of surrounding rock and optimization of support systems in fault-crossing tunnels

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2025-01-21 DOI:10.1007/s10064-024-04065-2

Chengcheng Zheng, Peng He, Gang Wang, Feng Jiang, Zhiyong Xiao, Jie An, Chuanxin Yang

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Abstract

During the construction of engineering projects, it is inevitable to cross fault and fractured zones, which are key geological factors that affect the stability of surrounding rock in tunnels. To study the distribution pattern of instability in surrounding rock and the optimization of synergetic support systems in fault-crossing tunnels, a comprehensive identification method integrating multi-source geological information was proposed, fully considering the geometric shape and distribution characteristics of rock fractures. The location of faults in actual projects was determined using this method, and a detailed three-dimensional numerical model was established accordingly. By simulating tunnel excavation, the spatial distribution pattern and grading characteristics of unstable blocks in surrounding rock were analyzed. Meanwhile, based on the original support methods, the effectiveness of synergetic support in stabilizing surrounding rock in tunnels was revealed, and initial support measures tailored to the characteristics of fault-crossing tunnels were proposed. The research results can provide reliable references for disaster prediction, prevention, and control in fault-crossing tunnels and underground engineering.

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跨断隧道围岩失稳及支护系统优化研究

在工程建设过程中，不可避免地要穿越断层破碎带，这是影响隧道围岩稳定性的关键地质因素。为研究跨断隧道围岩失稳分布规律及协同支护系统优化，在充分考虑岩体裂隙几何形态和分布特征的基础上，提出了一种综合多源地质信息的综合识别方法。利用该方法确定了实际工程中的断层位置，并建立了详细的三维数值模型。通过模拟隧道开挖，分析了围岩不稳定块体的空间分布规律和级配特征。同时，在原有支护方法的基础上，揭示了协同支护稳定隧道围岩的有效性，提出了适合跨断隧道特点的初始支护措施。研究成果可为跨断隧道及地下工程灾害预测、防治提供可靠参考。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.