A new optimization method of initial support for TBM tunnel crossing fault zone based on deformation control contribution

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2025-01-28 DOI:10.1007/s10064-025-04122-4

Peng Lin, Jintao Kang, Zhenhao Xu

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Abstract

The optimization and quantitative evaluation of tunnel support systems under complex geological conditions remains challenging. Therefore, a definition ‘deformation control contribution’ is put forward to quantitatively evaluate the effect of initial support on controlling the rock deformation. And a new optimization method of initial support is proposed for TBM tunnel crossing fault zone based on deformation control contribution. Firstly, the deformation characteristics of surrounding rock were explored. Subsequently, a series of numerical tests were conducted to investigate the deformation control effect of shotcrete, bolt, and steel arch parameters. Finally, the deformation control contribution of different support systems in fault-controlled section is quantitatively evaluated. The results show that: (1) The influence of support parameters on surrounding rock deformation is different. In terms of influence degree, the thickness of shotcrete is greater than stiffness, The spacing of bolts has greater influence than length, and the cross-sectional area, moment of inertia and spacing of steel arches are similar. (2) The deformation control contribution of the support systems in fault-controlled section is different. In bed rock zone, the contribution of shotcrete is highest (59.9%~67.6%). In fault damaged zone, the contribution of steel arch is highest (46.3%~56.2%). In fault core, the contribution of steel arch is also the highest (47.5%~62.2%). (3) The optimal support systems and support parameters for fault-controlled section are proposed, and the synergistic mechanism among support systems is revealed by stress analysis. The research results provide effective guidance for the dynamic design and optimization of the tunnel support systems.

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基于变形控制贡献的隧道掘进机穿越断裂带初始支护优化新方法

复杂地质条件下隧道支护系统的优化与定量评价是一个具有挑战性的课题。为此，提出了“变形控制贡献”的定义，定量评价初始支护对控制岩石变形的效果。在此基础上，提出了一种基于变形控制贡献的TBM隧道穿越断裂带初始支护优化方法。首先，探讨了围岩的变形特征。随后，进行了一系列数值试验，研究了喷射混凝土、锚杆和钢拱参数的变形控制效果。最后，定量评价了断控段不同支护体系的变形控制贡献。结果表明：(1)支护参数对围岩变形的影响是不同的。在影响程度上，喷射混凝土的厚度大于刚度，螺栓间距的影响大于长度，钢拱的截面积、转动惯量和间距的影响相似。(2)断控段各支护系统的变形控制贡献不同。在基岩带，喷射混凝土的贡献率最高（59.9%~67.6%）。在断裂破坏带中，钢拱的贡献最大（46.3%~56.2%）。在断芯中，钢拱的贡献也最大（47.5%~62.2%）。(3)提出了断控段的最优支护体系和支护参数，并通过应力分析揭示了各支护体系之间的协同作用机制。研究结果为隧道支护系统的动态设计与优化提供了有效的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.