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Open AccessArticle

Response of a Porous Seabed around an Immersed Tunnel under Wave Loading: Meshfree Model

by Shuang Han 1,†, Dong-Sheng Jeng 1,*,† and Chia-Cheng Tsai 2,3,4,†
1
School of Engineering and Built Environment, Griffith University Gold Coast Campus, Queensland 4222, Australia
2
Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 80778, Taiwan
3
Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
4
Center of Excellence for Ocean Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
J. Mar. Sci. Eng. 2019, 7(10), 369; https://doi.org/10.3390/jmse7100369
Received: 22 August 2019 / Revised: 11 October 2019 / Accepted: 12 October 2019 / Published: 17 October 2019
(This article belongs to the Special Issue New Advances in Marine Engineering Geology)
Seabed instability surrounding an immersed tunnel is a vital engineering issue regarding the design and maintenance for submarine tunnel projects. In this study, a numerical model based on the local radial basis function collocation method (LRBFCM) is developed to evaluate the seabed behaviour in a marine environment, in which the seabed is treated as the porous medium and governed by Biot’s “ u p ” approximation. As for the flow field above the seabed, the VARANS equations are used to simulate the fluid motion and properties. The present model is validated with analytical solutions and experimental data which show a good capacity of the integrated model. Both wave and current loading are considered in this study. Parametric studies are carried out to investigate the effects of wave characteristics and soil properties. Based on the numerical results, the maximum liquefaction depth around the immersed tunnel could be deeper under the wave loading with long wave period (T) and large wave height (H). Moreover, a seabed with lower permeability ( K s ) and degree of saturation ( S r ) is more likely to be liquefied. View Full-Text
Keywords: meshfree method; VARANS; Biot’s “up” approximation; wave-current induced seabed response; immersed tunnel meshfree method; VARANS; Biot’s “up” approximation; wave-current induced seabed response; immersed tunnel
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Han, S.; Jeng, D.-S.; Tsai, C.-C. Response of a Porous Seabed around an Immersed Tunnel under Wave Loading: Meshfree Model. J. Mar. Sci. Eng. 2019, 7, 369.

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