Working Face Stability Analysis of a Quasi‐Rectangular Pipe‐Jacking Tunnel Considering the Carrying‐Soil Effect

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-08 DOI:10.1002/nag.3982

Fu Huang, Yongtao Wang, Min Zhang, Qiujing Pan

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Abstract

Compared with circular shield tunnels, quasi‐rectangular pipe‐jacking tunnels have the advantages of smaller construction disturbances and higher space utilization rates, which are widely applied in urban underground engineering. The carrying‐soil effect is a specific phenomenon during the construction of pipe‐jacking tunnels. To study the influence of carrying‐soil effect on the working face stability of a quasi‐rectangular pipe‐jacking tunnel, the collapse and blow‐out failure mechanisms of the working face are established on the basis of spatial discretization technique. By analysing the mechanical mechanism of the carrying‐soil effect, the upper bound solution of the critical chamber pressure of the working face that considers the carrying‐soil effect is obtained in this paper. Based on an actual project, the theoretical results are compared with the numerical results, proving the effectiveness of the proposed method. Furthermore, parametric analysis indicates that the jacking distance of the pipe‐jacking tunnel has a significant influence on the working face stability, while the influence of the frictional force between the soil and the pipe is relatively small.

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考虑携土效应的准矩形顶管巷道工作面稳定性分析

与圆形盾构隧道相比，准矩形顶管隧道具有施工干扰小、空间利用率高等优点，在城市地下工程中得到了广泛应用。挟土效应是顶管隧道施工过程中的一种特殊现象。为研究载土效应对准矩形顶管巷道工作面稳定性的影响，基于空间离散化技术建立了工作面坍塌和井喷破坏机理。通过分析携土效应的力学机理，得到了考虑携土效应的工作面临界硐室压力上界解。结合工程实例，将理论计算结果与数值计算结果进行了比较，验证了所提方法的有效性。参数分析表明，顶管隧道顶进距离对工作面稳定性有显著影响，而土-管摩擦力对工作面稳定性的影响相对较小。

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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.