4.7 Article

Design equation for stability of a circular tunnel in anisotropic and heterogeneous clay

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Summary: This paper presents new lower bound solutions for the active failure of trapdoors in clays with anisotropic strengths, utilizing second-order cone programming and finite element limit analysis. The undrained stability of the problem under plane strain conditions is investigated, and nonlinear regression analysis is employed to propose new design equations for estimating trapdoor stability. The effects of trapdoor roughness, cover-depth ratios, strength gradient ratios, and anisotropic strength ratios on trapdoor stability factors and failure mechanisms are also examined and discussed.

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