Face stability assessment of a longitudinally inclined tunnel considering pore water pressure

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-07-25 DOI:10.1002/nag.3815

Guang-Hui Chen, Jin-Feng Zou, Yuan-Cheng Guo, Zi-An Tan, Shu Dan

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引用次数: 0

Abstract

The face stability analysis of a longitudinally inclined shield tunnel using an analytical approach in water-rich areas is still a research gap. To solve this face stability problem, a numerical simulation based on the FLAC3D is first conducted to calculate the seepage field behind the inclined tunnel face. An improved rotational failure mechanism is developed to make it possible to investigate the face stability of inclined tunnels using analytical approaches. In the framework of the kinematic approach of limit analysis, the limit support pressures and corresponding failure surfaces of the inclined tunnel face are determined to analyze the face stability issue. The interpolation tool (griddata) in MATLAB is adopted to involve the obtained numerical values of pore water pressures into the analysis of the stability issue. The analytical solutions obtained from the proposed method are validated by comparisons with existing results from published literatures and numerical results. For a quick estimation of the inclined tunnel face stability in water-rich areas, a series of design charts are then presented for various soil strength parameters, water tables, and inclined angles. Finally, an application of the proposed method to a practical tunneling case is provided, which further illustrates the effectiveness of the proposed method.

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考虑孔隙水压力的纵向倾斜隧道工作面稳定性评估

采用分析方法对富水区纵向倾斜盾构隧道进行工作面稳定性分析仍是一项研究空白。为解决该工作面稳定性问题，首先进行了基于 FLAC3D 的数值模拟，以计算倾斜隧道工作面后方的渗流场。通过改进的旋转破坏机制，可以利用分析方法研究倾斜隧道的工作面稳定性。在极限分析运动学方法的框架内，确定了倾斜隧道工作面的极限支撑压力和相应的破坏面，以分析工作面的稳定性问题。采用 MATLAB 中的插值工具（griddata）将获得的孔隙水压力数值纳入稳定性问题分析。通过与已发表文献中的现有结果和数值结果进行比较，验证了从所提方法中获得的分析解。为了快速估算富水地区倾斜隧道面的稳定性，还给出了一系列针对不同土壤强度参数、地下水位和倾斜角度的设计图表。最后，将所提方法应用于一个实际隧道案例，进一步说明了所提方法的有效性。

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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.