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<p>The limit failure modes and earth pressure distribution of excavation retaining structures under rotating about the top (RT) displacement mode were systematically investigated. Finite element limit analysis incorporating the HMC constitutive model was employed, leading to the establishment of a logarithmic spiral failure surface model that accurately characterizes curved slip surfaces, overcoming the limitations of conventional Coulomb failure surface assumptions. An asymmetric soil arching effect characterized by a distinctive arch feet difference (Δ<i>h</i>) was identified. An optimized arch-shaped differential element method was developed, in which asymmetric arch-shaped differential elements were established along the principal stress rotation trajectory at the soil's limit state. Analytical expressions for earth pressure were subsequently derived based on their mechanical equilibrium equations. Systematic parametric studies were conducted to quantitatively analyze the influence of soil properties, interface friction angle, and surface surcharge on earth pressure distribution, resultant force, and its point of application. These combined advances establish a refined theoretical framework for earth pressure calculation, offering engineers improved design accuracy for excavation retaining structures.</p>

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Earth pressure of c–φ soils behind excavation retaining structures rotating about the top

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Chang Chen,
  • Fu-quan Chen,
  • Gang Cai,
  • Zhao-yi Cai

摘要

The limit failure modes and earth pressure distribution of excavation retaining structures under rotating about the top (RT) displacement mode were systematically investigated. Finite element limit analysis incorporating the HMC constitutive model was employed, leading to the establishment of a logarithmic spiral failure surface model that accurately characterizes curved slip surfaces, overcoming the limitations of conventional Coulomb failure surface assumptions. An asymmetric soil arching effect characterized by a distinctive arch feet difference (Δh) was identified. An optimized arch-shaped differential element method was developed, in which asymmetric arch-shaped differential elements were established along the principal stress rotation trajectory at the soil's limit state. Analytical expressions for earth pressure were subsequently derived based on their mechanical equilibrium equations. Systematic parametric studies were conducted to quantitatively analyze the influence of soil properties, interface friction angle, and surface surcharge on earth pressure distribution, resultant force, and its point of application. These combined advances establish a refined theoretical framework for earth pressure calculation, offering engineers improved design accuracy for excavation retaining structures.