Numerical Study of Wave-Induced Dynamic Soil Response and Liquefaction

doi:10.16183/j.cnki.jsjtu.2014.11.018

Abstract

Abstract:

In this paper, based on Biot's theory, a numerical model for wave-seabed-pipeline dynamic response was established to investigate seabed instability failure. The seabed was treated as porous medium. The model simulated the distribution of pore pressure and effective stress, and the process of liquefaction around buried pipeline under various wave loads were investigated. Partly dynamic (u-p) formulations for the wave-induced response of the seabed with pipeline were adopted. In partly dynamic analysis, the u-p formulation in which both displacement and pore pressure were field variables was adopted considering the acceleration of soil skeleton while neglecting the inertial terms associated with pore water. Using COMSOL Multiphysics, a parametric study, including the permeability, degree of saturation, buried depth and wave height was conducted to investigate the seabed response. Then, a criterion for liquefied state was used and the possibility of wave-induced liquefaction occurring in porous seabed was studied.

Key words: pipeline, wave, dynamic response, liquefaction, parameter analysis

CLC Number:

ZHANG Jun, ZHOU Xiang-lian, YAN Yu-guang, GUO Jun-jie, WANG Jian-hua, JIANG Jun-da. Numerical Study of Wave-Induced Dynamic Soil Response and Liquefaction[J]. Journal of Shanghai Jiao Tong University, 2014, 48(11): 1621-1626.

Figures/Tables 14

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References 11

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海水参数						管线参数						海床参数
波高H	周期T	水深d	波长L	密度ρ_w	体积模量k_w	弹性模量E_p	泊松比μ_p	密度ρ_p	管线外径D	管线埋深e	管壁厚度t_p	海床厚度s	海床长度h（L）	泊松比μ_s	孔隙率n	密度ρ_s	弹性模量E	渗透系数K_z	饱和度S_r
2.0／m	8.0 s	12 m	70.93 m	1 000kg／m³	2 GPa	68 GPa	0.32	2 700 kg／m³	2.0 m	-4 m	0.1 m	50 m	100 m	0.4	0.4	2 650kg／m³	14 MPa	1.0 mm／s	0.99

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