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梁发云, 魏圣明, 陈可, 袁强, 闫静雅, 顾晓强. 基于UH模型的盾构隧道非线性地基反力确定方法[J]. 岩土工程学报. DOI: 10.11779/CJGE20230919
引用本文: 梁发云, 魏圣明, 陈可, 袁强, 闫静雅, 顾晓强. 基于UH模型的盾构隧道非线性地基反力确定方法[J]. 岩土工程学报. DOI: 10.11779/CJGE20230919
A Method for Determining Nonlinear Foundation Reaction Coefficient of Shield Tunnels Based on UH Model[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20230919
Citation: A Method for Determining Nonlinear Foundation Reaction Coefficient of Shield Tunnels Based on UH Model[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20230919

基于UH模型的盾构隧道非线性地基反力确定方法

A Method for Determining Nonlinear Foundation Reaction Coefficient of Shield Tunnels Based on UH Model

  • 摘要: 为合理反映堆载作用下盾构隧道地基系数的非线性特征,基于UH模型(统一硬化模型)和MSD方法(Mobilizable Strength Design)提出了一种确定隧道非线性地基反力的方法;并以隧道中心处的土体应力-应变曲线描述全土域的力学行为,提出了预测盾构隧道地基反力的实用简化方法;基于上海第④、⑤1层土的UH模型统计参数,将隧道地基反力拟合为双曲线函数形式,进一步将由此获得的初始刚度及极限强度与本构模型参数进行拟合,提出上海地铁盾构隧道的地基反力函数表达式;通过对上海软土盾构隧道堆载工况的多因素分析,验证了该公式对隧道大变形预测问题的实用性。计算结果表明,堆载工况下隧道收敛变形对地基反力曲线的初始刚度要比其极限强度更为敏感,而隧道地基初始刚度主要与土体κ/λ、围压大小等因素相关。

     

    Abstract: To accurately capture the nonlinear characteristics of subgrade reaction surrounding shield tunnel under surcharge, a determination approach for the subgrade reaction of shield tunnel was implemented on the basis of the soil strength design method (MSD method) and the unified hardening model(UH model). The practical simplified version was proposed, by conducting the description of the mechanical properties of the entire soil zone with soil constitutive curves at the height of tunnel center. Furthermore, using the statistically derived UH constitutive parameters for soil layers ④ and ⑤1 in Shanghai, the subgrade reactions for both soil layers were predicted and fitted by using a hyperbolic curve function. After a secondary fitting process was conducted to obtain the initial stiffness and ultimate strength in relation to the constitutive model parameters, the functions of subgrade reactions for Shanghai's shield tunnels was established. Eventually, multifactorial evaluation of Shanghai's shield tunnels under surcharge conditions was performed, confirming the capacity of the developed formulas for predicting the large deformation of tunnel under surcharge. The convergence deformation of the tunnel under surcharge is more sensitive to the initial stiffness of subgrade reactions, governed by various soil parameters such as κ/λ and confining pressure, than to its ultimate strength.

     

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