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首页> 外文期刊>Mathematical Problems in Engineering >Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow
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Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow

机译：考虑竖向稳定流动的非饱和土中盾构隧道开挖面破坏破坏的上限分析

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摘要

Natural soils are mostly in an unsaturated state and the corresponding mechanical properties differ significantly from a saturated one. In traditional stability analysis for a shield tunnel face, the soil mass is typically assumed to be dry or saturated for convenience of analysis. In this work, based on the upper bound theorem of classical plasticity theory and the log-spiral failure mechanism, face stability of the shield tunnel excavated in unsaturated soils under vertical steady flow is studied. The profile of shear strength is determined by virtues of the unified effective stress approach and the analytical solution of matric suction under unsaturated steady flow. On this basis, the analytical expression for the supporting pressure is deduced and the sequential quadratic programming is employed to search for the optimal upper bound solution. Through parametric analysis it is found the fitting parameters of SWCC and the groundwater level affect the supporting pressure notably. Besides, the relevant influence of vertical discharge is also significant when clayey soils are concerned.
机译：天然土壤大多处于不饱和状态，相应的机械性能与饱和土壤有很大不同。在传统的盾构隧道工作面稳定性分析中，为了便于分析，通常假定土壤质量是干燥或饱和的。基于经典可塑性理论的上限定理和对数螺旋破坏机理，研究了竖向稳定流下非饱和土中开挖的盾构隧道的工作面稳定性。剪切强度的分布取决于统一的有效应力方法和非饱和稳定流下基质吸力的解析解。在此基础上，推导了支撑压力的解析表达式，并采用顺序二次规划法寻求最优的上限解。通过参数分析发现，SWCC的拟合参数和地下水位对支护压力有显着影响。此外，当涉及黏土时，垂直排放的相关影响也很显着。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第2期|2145616.1-2145616.10|共10页
  • 作者

    Zhang Jia-hua; Wang Wei-jun; Zhang Biao; Zhang Dao-bing;

  • 作者单位

    Hunan Univ Sci & Technol Hunan Prov Key Lab Safe Min Techn Coal Mines Work Safety Key Lab Prevent & Control Gas & Roof Xiangtan 411201 Hunan Peoples R China;

    Hunan Univ Sci & Technol Sch Civil Engn Xiangtan 411201 Hunan Peoples R China;

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