波浪作用下管线-海床模型动态响应及液化

doi:10.16183/j.cnki.jsjtu.2014.11.018

上海交通大学学报 ›› 2014, Vol. 48 ›› Issue (11): 1621-1626.doi: 10.16183/j.cnki.jsjtu.2014.11.018

所属专题：王建华教授学报发文专辑

波浪作用下管线-海床模型动态响应及液化

张军¹(), 周香莲¹^,²(), 颜宇光¹, 郭俊杰¹, 王建华¹, 江俊达¹

^1.上海交通大学船舶海洋与建筑工程学院海洋岩土工程研究中心
^2.上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室，上海　200240

收稿日期:2014-01-07 出版日期:2014-11-01 发布日期:2021-06-04
作者简介:张军（1990-)，男，安徽省宿松县人，硕士生，从事海洋岩土力学研究工作．E-mail:zhj900809@sjtu.edu.cn.|周香莲（联系人），女，副教授．电话（Tel.):021-34284833; E-mail:zhouxl@sjtu.edu.cn.
基金资助:
国家自然科学基金项目(41372286);海洋工程国家重点实验室青年创新基金(GKZD010059)

Numerical Study of Wave-Induced Dynamic Soil Response and Liquefaction

ZHANG Jun¹(), ZHOU Xiang-lian¹^,²(), YAN Yu-guang¹, GUO Jun-jie¹, WANG Jian-hua¹, JIANG Jun-da¹

^1.Center for Marine Geotechnical Engineering
^2.State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China

Received:2014-01-07 Online:2014-11-01 Published:2021-06-04

摘要/Abstract

摘要：

基于Biot动力方程，利用COMSOL多物理场有限元计算软件构建了波浪-海床-管线动力响应的计算模型，模拟了一阶斯托克斯波作用下管线周围土体孔压和有效应力分布情况，对海床土体的液化情况进行判断，研究了波浪诱发海床液化及管线失稳的机理．研究过程中采用Partly dynamic动力方程（u-p模式）．在Partly dynamic模型中，将海床视为多孔弹性介质，并且将孔压和位移视为场变量，考虑土体位移加速度，忽略孔隙流体惯性项的作用．模型得到验证后的参数研究表明：土体渗透系数、饱和度以及管线埋深、波高等参数对海床的孔压和有效应力影响显著．

关键词: 管线, 波浪, 动力响应, 液化, 参数分析

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

中图分类号:

张军, 周香莲, 颜宇光, 郭俊杰, 王建华, 江俊达. 波浪作用下管线-海床模型动态响应及液化[J]. 上海交通大学学报, 2014, 48(11): 1621-1626.

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.

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参考文献 11

[1]	Biot M A. Theory of propagation of elastic waves in a fluid-saturated porous solid, I, low-frequency rang[J]. Journal of the acoustical society of America, 1956, 28: 168-178.
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[5]	Xu H X. Wave-induced liquefaction processes in marine sediments[D]. Dundee: The University of Dundee, 2012
[6]	Cheng A H D, Liu P L F. Seepage force on a pipeline buried in a poroelastic seabed under wave loading[J]. Applied Ocean Research, 1986, 8(1): 22-32.
[7]	Turcotte B R, Liu P L F, Kulhawy F H. Laboratory evaluation of wave tank parameters for wave-sediment interaction[R]. School of Civil and Environmental Engineering, Cornell University, Ithaca, New York, 1984.
[8]	Zhou X L, Xu B, Wang J H, et al. An analytical solution for wave-induced seabed response in a multi-layered poro-elastic seabed[J]. Ocean Engineering, 2011, 38(1): 119-129.
[9]	Zhou X L, Wang J H, Zhang J, et al. Wave and current induced seabed response around a submarine pipeline in an anisotropic seabed[J]. Ocean Engineering, 2014, 75: 112-127.
[10]	刘博, 郑东生. 波流共同作用下多孔介质海床动力响应的解析解[J]. 工程地质学报, 2012, 20(5): 674-681.
	LIU Bo, ZHENG Dong-sheng. Analytical solution for dynamic response of porous seabed combined wave and current loadings[J]. Journal of Engineering Geology, 2012, 20(5): 674-681.
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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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波浪作用下管线-海床模型动态响应及液化

Numerical Study of Wave-Induced Dynamic Soil Response and Liquefaction

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