General Solution for Longitudinal Response of Shield Tunnel Considering the Effects of Joints and Soil Shear Resistance

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-12-04 DOI:10.1002/nag.3909

Weiming Huang, Yanwei Zang, Jinchang Wang, Changbao Liu, Zhongxuan Yang, Rongqiao Xu, Huajian Fang

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Abstract

This study introduces a general solution for assessing the longitudinal response of shield tunnels, incorporating the combined effects of joints and soil shear resistance. The analysis employs the Timoshenko beam spring model atop a Vlasov foundation, subjected to arbitrary loads and various boundary conditions. Governing equations and relevant boundary conditions are derived using a variational formulation. Validation is conducted against existing simplified analytical solutions and finite element method simulations, showing the efficacy of the proposed solution. Comparative analyses of different models are undertaken based on the potential energy considerations. Additionally, a parametric study explores influential factors such as subgrade shear and reaction coefficients, as well as joint stiffnesses. Findings highlight the significance of accounting for the soil shear resistance and caution against underestimation when using equivalent continuous beam models. The proposed solution improves the prediction accuracy for the longitudinal response of shield tunnels and offers several benefits including compatibility with other analytical models, computation efficiency, and versatility in considering diverse loads and boundary conditions.

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考虑节理和土体抗剪作用的盾构隧道纵向响应通解

本文介绍了一种综合考虑节理和土体抗剪效应的盾构隧道纵向响应评估的通用解。该分析采用了弗拉索夫基础上的铁木申科梁弹簧模型，承受任意载荷和各种边界条件。用变分公式推导了控制方程和相关边界条件。通过对现有简化解析解和有限元仿真进行验证，验证了所提解的有效性。基于势能的考虑，对不同模型进行了对比分析。此外，参数化研究探讨了影响因素，如路基剪切和反应系数，以及节点刚度。研究结果强调了在使用等效连续梁模型时考虑土壤抗剪性的重要性和对低估的警告。该方法提高了盾构隧道纵向响应的预测精度，并具有与其他分析模型的兼容性、计算效率以及考虑不同荷载和边界条件的通用性等优点。

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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.