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Geomechanics and Engineering
  Volume 10, Number 4, April 2016, pages 387-403
DOI: http://dx.doi.org/10.12989/gae.2016.10.4.387
 


An integrated model for pore pressure accumulations in marine sediment under combined wave and current loading
Y. Zhang, D.-S. Jeng, H.-Y. Zhao and J.-S. Zhang

 
Abstract
    In this paper, an integrated model for the wave (current)-induced seabed response is presented. The present model consists of two parts: hydrodynamic model for wave-current interactions and poro-elastic seabed model for pore accumulations. In the wave-current model, based on the fifth-order wave theory, ocean waves were generated by adding a source function into the mass conservation equation. Then, currents were simulated through imposing a steady inlet velocity on one domain and pressure outlet on the other side. In addition, both of the Reynolds-Averaged Navier-Stokers (RANS) Equations and k-ε turbulence model would be applied in the fluid field. Once the wave pressures on the seabed calculated through the wave-current interaction model, it would be applied to be boundary conditions on the seabed model. In the seabed model, the poro-elastic theory would be imposed to simulate the seabed soil response. After comparing with the experimental data, the effect of currents on the seabed response would be examined by emphasize on the residual mechanisms of the pore pressure inside the soil. The build-up of the pore water pressure and the resulted liquefaction phenomenon will be fully investigated. A parametric study will also be conducted to examine the effects of waves and currents as well as soil properties on the pore pressure accumulation.
 
Key Words
    waves and currents; poro-elastic; pore pressure accumulation; liquefaction
 
Address
(1) Y. Zhang, D.-S. Jeng:Department of Civil Engineering, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
(2) D.-S. Jeng, H.-Y. Zhao:
Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia;
(3) J.-S. Zhang:
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu 210098, China.
 

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