Time-domain solution for soil feedback induced by shield tunneling in viscoelastic strata considering influences of surcharge loading

ZHANG Zhi-guo; ZHANG Yang-bin; ZHANG Cheng-ping; WANG Zhi-wei; PAN Y T

doi:10.11779/CJGE202101004

Volume 43 Issue 1

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Chinese Journal of Geotechnical Engineering > 2021 > 43(1): 34-42. > DOI: 10.11779/CJGE202101004

ZHANG Zhi-guo, ZHANG Yang-bin, ZHANG Cheng-ping, WANG Zhi-wei, PAN Y T. Time-domain solution for soil feedback induced by shield tunneling in viscoelastic strata considering influences of surcharge loading[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(1): 34-42. DOI: 10.11779/CJGE202101004

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Time-domain solution for soil feedback induced by shield tunneling in viscoelastic strata considering influences of surcharge loading

1.
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
2.
State Key Laboratory for Track Technology of High-Speed Railway, China Academy of Railway Sciences, Beijing 100081, China
3.
Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
4.
Department of Civil and Environmental Engineering, National University of Singapore, Singapore, 119077

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Received Date: November 18, 2019
Available Online: December 04, 2022

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Abstract

At present, the researches on the influences of deformation of surrounding soil induced by shield tunneling in soft soils are generally based on instantaneous excavation conditions, less considering the rheological characteristics of viscoelastic soils. Furthermore, little attention is paid to the impact of surcharge loading on the shield tunneling. From the perspective of viscoelastic foundation, the elliptical convergence deformation mode around tunnel cavity is introduced. Using the complex variable theory and the Laplace transform technique, the time-domain solution for displacement and stress of surrounding soils induced by shield tunneling is proposed under the influences of surcharge loading. Based on the relevant actual projects, the measured values are compared with the simplified analytical solutions, and good consistency is obtained. The results show that the time-domain solution can reflect the influences of shield tunneling on the displacements of surrounding soils under surcharge loading and the development trend of soil deformation with time. Under the influences of surcharge loading, the ground deformation due to tunneling continues to increase as time goes by while the changing rate of soil settlements shows a gradual decline until it reaches zero. The sudden alternation of surcharge loading causes the surface settlement, especially the settlement rate, to change significantly. The research results have certain theoretical guiding significance for tunnel construction controlling within the scope of viscous strata and dense buildings.
- shield tunnel,
- surcharge loading,
- viscoelasticity,
- elliptical convergence deformation,
- time-domain solution

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Time-domain solution for soil feedback induced by shield tunneling in viscoelastic strata considering influences of surcharge loading

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