Method for determining nonlinear foundation reaction of shield tunnels based on the UH model

LIANG Fayun; WEI Shengming; CHEN Ke; YUAN Qiang; YAN Jingya; GU Xiaoqiang

doi:10.11779/CJGE20230919

Volume 47 Issue 2

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Chinese Journal of Geotechnical Engineering > 2025 > 47(2): 284-295. > DOI: 10.11779/CJGE20230919

LIANG Fayun, WEI Shengming, CHEN Ke, YUAN Qiang, YAN Jingya, GU Xiaoqiang. Method for determining nonlinear foundation reaction of shield tunnels based on the UH model[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(2): 284-295. DOI: 10.11779/CJGE20230919

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Method for determining nonlinear foundation reaction of shield tunnels based on the UH model

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Shanghai Shentong Metro Group, Shanghai 200070, China

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Received Date: September 17, 2023
Available Online: June 12, 2024

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Abstract

Abstract

To accurately capture its nonlinear characteristics under surcharge, an approach for the subgrade reaction of shield tunnels is implemented on the basis of the soil strength design method (MSD method) and the unified hardening model (UH model). The practical simplified version is proposed by conducting the description of the mechanical properties of the entire soil zone with constitutive curves of soils 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 are predicted and fitted by using the hyperbolic curve function. After the secondary fitting process is conducted to obtain the initial stiffness and the ultimate strength in relation to the parameters of the constitutive model, the functions for subgrade reactions of shield tunnels in Shanghai are established. Eventually, the multifactorial evaluation of shield tunnels in Shanghai under surcharge conditions is performed, confirming the capacity of the developed formulas for predicting the large deformation of tunnels under surcharge. The convergence deformation of the tunnels 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.
- subgrade reaction curve,
- UH model,
- MSD method,
- surcharge,
- metro tunnel

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References

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