An analytical solution to ground stresses induced by tunneling considering ground surface boundary conditions and gravity

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2024-10-03 DOI:10.1016/j.compgeo.2024.106806

Cheng-Cheng Zhang, Ren-Peng Chen, Huai-Na Wu, Fan-Yan Meng, Xin-Xin Yang

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引用次数: 0

Abstract

Accurately predicting the stress distribution around the tunnel is crucial for designing safe and economical support systems. The stress distribution is closely related to the ground stress release induced by tunneling, as well as the initial gravity stress and boundary conditions. In this study, a two-dimensional analytical model considering the ground surface boundary conditions and gravity is presented to investigate the stress field around the tunnel. Then, a numerical model was developed to validate the proposed analytical model. Finally, parametric analyses were conducted, and the limitations of the load calculation method of the code for design of shield tunnel in China were discussed. The results indicate that: (a) Tunnel excavation induces stress redistribution in the soil, resulting in a soil arching effect around the tunnel. This arching effect causes nonlinear load changes around the tunnel. (b) The soil mass around the tunnel can be divided into undisturbed and disturbed zones. Above the tunnel, the disturbance range is C-2D(C and D represent the burial depth and the tunnel diameter), while below and on both sides of the tunnel, the disturbance ranges are 4D and 1.5D, respectively. (c) Once the stress release rate reaches 0.6, a combined arching effect zone, consisting of both major and minor principal stresses, is formed in the disturbance zone above and below the tunnel. (d) The load distribution pattern calculated by the code for design of shield tunnel in China is gourd-shaped, and this calculation method is insufficient for accurately evaluating the load around the tunnel. The research results can provide a reference for the design of the shield tunnel.

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考虑地表边界条件和重力的隧道工程地应力分析法

准确预测隧道周围的应力分布对于设计安全、经济的支护系统至关重要。应力分布与隧道施工引起的地应力释放、初始重力应力和边界条件密切相关。本研究提出了一个考虑地表边界条件和重力的二维分析模型，以研究隧道周围的应力场。然后，开发了一个数值模型来验证所提出的分析模型。最后，进行了参数分析，并讨论了中国盾构隧道设计规范中荷载计算方法的局限性。结果表明(a) 隧道开挖引起土体应力重新分布，导致隧道周围土体产生起拱效应。这种起拱效应会导致隧道周围的荷载发生非线性变化。(b) 隧道周围的土体可分为未扰动区和扰动区。隧道上方的扰动范围为 C-2D（C 和 D 分别代表埋深和隧道直径），而隧道下方和两侧的扰动范围分别为 4D 和 1.5D。(c) 当应力释放率达到 0.6 时，隧道上方和下方的扰动区将形成由大主应力和小主应力组成的联合拱起效应区。(d) 我国盾构隧道设计规范计算的荷载分布模式为葫芦形，这种计算方法不足以准确评估隧道周围的荷载。研究成果可为盾构隧道的设计提供参考。

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

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.