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    • A New Optimization Method of Initial Support for TBM Tunnel Crossing Fault Zone Based on Deformation Control Contribution

    Peng Lin,Jintao Kang,Zhenhao Xu

    Bulletin of Engineering Geology and the Environment（2025）

    Shandong University

    Cited 0|Views9
    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
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    Key words
    Support optimization,Contribution,Numerical simulation,TBM,Fault Zone
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