Influence of channel dredging on subsea shield tunnel using FEM

DOI

10.2991/icseee-15.2016.33How to use a DOI?

Keywords

Channel dredging; underwater tunnel; back silting; finite element method.

Abstract

Subsea tunnel construction has become the prevalent tendency connecting countries and districts, Controlling and minimizing the negative influence of channel dredging on tunnel have great significance throughout the tunnel construction and operation phase. So a three-dimensional finite element model of soil-tunnel and port structures was established given the tunnel surrounding rock to be isotropic elasto-plastic media meeting Drucker-Prager criterion of continuum, the construction conditions of channel excavation, back silting and desilting were investigated and the calculation results were analyzed. The numerical calculation results show that: the channel dredging increased the deformation and stress discrepancy along the tunnel longitudinal direction, the distinct affection happened at the locations beneath the ocean bottom, and the maximum value occurred mainly at the position of tunnel segments in the domain of retaining wall. Moreover, channel dredging decreased the ground settlement induced by tunnel excavation, and siltation made partially the spring-back displacement. Therefore an evaluation of the influence of repeated loads on tunnel should also be considered integrally to determine the dredging scheme in the future project.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Xianghong Chen
AU  - Lianjin Tao
AU  - Xi Chen
PY  - 2016/04
DA  - 2016/04
TI  - Influence of channel dredging on subsea shield tunnel using FEM
BT  - Proceedings of the 2015 4th International Conference on Sustainable Energy and Environmental Engineering
PB  - Atlantis Press
SP  - 191
EP  - 195
SN  - 2352-5401
UR  - https://doi.org/10.2991/icseee-15.2016.33
DO  - 10.2991/icseee-15.2016.33
ID  - Chen2016/04
ER  -