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Face stability analysis of a shallow square tunnel in non-homogeneous soils

机译:非均质土中浅埋方形隧道的工作面稳定性分析

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摘要

An improved approach for the face stability analysis of shallow square tunnels in non-homogeneous soils is investigated in this study. Based on the discrete technique, an improved 3D failure mechanism is proposed to investigate the face stability of square tunnels by incorporating the soil arching effect in the framework of the limit analysis theory. To better assess the stability issue, the non-homogeneous frictional angle phi is also considered when calculating the critical support pressures. The results obtained from this study are validated by those from the 3D finite element limit analysis and an advanced wedge-prism model based on an existing research on the limit equilibrium method.
机译:本文研究了一种改进的非均质土中浅埋方形隧道面板稳定性分析方法。在离散技术的基础上,提出了一种改进的3D破坏机制,通过在极限分析理论的框架内结合土拱效应来研究方形隧道的工作面稳定性。为了更好地评估稳定性问题,在计算临界支撑压力时还应考虑非均匀摩擦角phi。这项研究的结果已通过3D有限元极限分析和基于极限平衡方法的现有研究的高级楔形棱镜模型得到了验证。

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