An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction

An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction

An analytical continuous upper bound limit analysis is developed to analyse the effects of seepage on the transverse stability of underwater shield tunnels. The approach is based on an analytical continuous upper bound limit analysis method for cohesive-frictional soils. It employs the complex varia...

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Main Authors: Song Wenjie, Xiang Yanyong
Format: Article
Language:English
Published: EDP Sciences 2020-01-01
Series:E3S Web of Conferences
Online Access:https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/03/e3sconf_arfee2020_01015.pdf
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spelling doaj-32f3d8cb61b94d73b8cf9a429c23e5362021-02-02T05:38:45ZengEDP SciencesE3S Web of Conferences2267-12422020-01-011430101510.1051/e3sconf/202014301015e3sconf_arfee2020_01015An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during ConstructionSong Wenjie0Xiang Yanyong1Beijing Jiaotong University, School of Civil EngineeringBeijing Jiaotong University, School of Civil EngineeringAn analytical continuous upper bound limit analysis is developed to analyse the effects of seepage on the transverse stability of underwater shield tunnels. The approach is based on an analytical continuous upper bound limit analysis method for cohesive-frictional soils. It employs the complex variables solution of the displacement field due to tunnel deformation and movement, and the analytical solution of the pore water pressure field for steady state seepage due to pore water influx at the tunnel perimeter. The most critical slip line position and the minimum required tunnel support pressure are determined by using a particle swarm optimization scheme for various generic situations. The method is verified via finite element simulation and comparison with the solution from using rigid block upper bound limit analysis. The parametric analysis revealed among other things that both the infimum of the necessary tunnel support pressure and the most critical plastic zone increase when the hydraulic head at the ground surface increases, but decrease when the tunnel influx increases due to the fact that pore water pressure at the tunnel perimeter decreases with the tunnel influx.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/03/e3sconf_arfee2020_01015.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Song Wenjie
Xiang Yanyong
spellingShingle Song Wenjie
Xiang Yanyong
An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction
E3S Web of Conferences
author_facet Song Wenjie
Xiang Yanyong
author_sort Song Wenjie
title An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction
title_short An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction
title_full An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction
title_fullStr An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction
title_full_unstemmed An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction
title_sort analytical continuous upper bound limit analysis of pore water effect on the tail stability of underwater shield tunnels during construction
publisher EDP Sciences
series E3S Web of Conferences
issn 2267-1242
publishDate 2020-01-01
description An analytical continuous upper bound limit analysis is developed to analyse the effects of seepage on the transverse stability of underwater shield tunnels. The approach is based on an analytical continuous upper bound limit analysis method for cohesive-frictional soils. It employs the complex variables solution of the displacement field due to tunnel deformation and movement, and the analytical solution of the pore water pressure field for steady state seepage due to pore water influx at the tunnel perimeter. The most critical slip line position and the minimum required tunnel support pressure are determined by using a particle swarm optimization scheme for various generic situations. The method is verified via finite element simulation and comparison with the solution from using rigid block upper bound limit analysis. The parametric analysis revealed among other things that both the infimum of the necessary tunnel support pressure and the most critical plastic zone increase when the hydraulic head at the ground surface increases, but decrease when the tunnel influx increases due to the fact that pore water pressure at the tunnel perimeter decreases with the tunnel influx.
url https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/03/e3sconf_arfee2020_01015.pdf
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AT xiangyanyong ananalyticalcontinuousupperboundlimitanalysisofporewatereffectonthetailstabilityofunderwatershieldtunnelsduringconstruction
AT songwenjie analyticalcontinuousupperboundlimitanalysisofporewatereffectonthetailstabilityofunderwatershieldtunnelsduringconstruction
AT xiangyanyong analyticalcontinuousupperboundlimitanalysisofporewatereffectonthetailstabilityofunderwatershieldtunnelsduringconstruction
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