风浪荷载共同作用下的海洋桩基动力响应

doi:10.16183/j.cnki.jsjtu.2019.246

上海交通大学学报 ›› 2021, Vol. 55 ›› Issue (9): 1116-1125.doi: 10.16183/j.cnki.jsjtu.2019.246

所属专题：《上海交通大学学报》2021年“土木建筑工程”专题；《上海交通大学学报》2021年12期专题汇总专辑

风浪荷载共同作用下的海洋桩基动力响应

李宛玲¹^,³, 张琪¹^,³, 周香莲¹^,²()

1.上海交通大学海洋工程国家重点实验室, 上海 200240
2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室, 武汉 430071
3.上海交通大学土木工程系, 上海 200240

收稿日期:2019-08-20 出版日期:2021-09-28 发布日期:2021-10-08
通讯作者: 周香莲 E-mail:zhouxl@sjtu.edu.cn
作者简介:李宛玲(1994-),女,山西省运城市人,硕士生,主要研究方向为海洋岩土力学与工程.
基金资助:
国家自然科学基金(41572243);国家自然科学基金(41727802)

Dynamic Response of Marine Pile Foundation Under Combined Action of Wind and Wave Loads

LI Wanling¹^,³, ZHANG Qi¹^,³, ZHOU Xianglian¹^,²()

1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
3. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2019-08-20 Online:2021-09-28 Published:2021-10-08
Contact: ZHOU Xianglian E-mail:zhouxl@sjtu.edu.cn

摘要/Abstract

摘要：

为了研究海洋环境中风浪荷载共同作用下单桩基础的动力响应问题,建立了风浪-海床-单桩的三维单向耦合数值模型.分别采用雷诺平均N-S方程和Biot动力方程控制波浪运动和海床响应,在验证模型合理性的基础上,探究了风浪参数(如风速、风剪切系数、波高)对风浪荷载共同作用下流体与桩基响应的影响规律.结果表明:风速、风剪切系数和波高的增长会加剧桩周流体变形,加快波浪传播,进而影响桩身的水平位移与弯矩.因此,在计算海上桩基承载力时,应综合考虑风浪荷载共同作用对桩基基础的影响.研究成果将为恶劣海洋环境下桩基承载性能研究提供重要的理论依据.

关键词: 风浪荷载, Biot动力方程, u-p模型, 风浪相互作用, 单桩

Abstract:

In order to study the dynamic response of a single pile foundation under combined action of wind and wave loads in the marine environment, a three-dimensional unidirectional coupling numerical model of wind wave-seabed-single pile is established. The Reynolds average N-S equation and the Biot dynamic equation are used to control the wave motion and seabed response respectively. Based on the verification of the rationality of the model, the influence of wind and wave parameters (such as wind speed, wind shear coefficient, and wave height) on the response of fluid and pile foundation under combined action of wind and wave loads are explored. The results show that the increase of wind speed, wind shear coefficient, and wave height will aggravate the fluid deformation around the pile, accelerate the wave propagation, and then affect the horizontal displacement and bending moment of the pile. Therefore, when calculating the bearing capacity of offshore pile foundations, the combined effect of wind and wave loads on the pile foundation should be considered comprehensively. The results will provide an important theoretical basis for the study of the bearing performance of pile foundations in harsh marine environments.

Key words: wind and wave load, Biot’s dynamic equation, u-p model, interaction of wind and wave, monopile

中图分类号:

TU473
P751

李宛玲, 张琪, 周香莲. 风浪荷载共同作用下的海洋桩基动力响应[J]. 上海交通大学学报, 2021, 55(9): 1116-1125.

LI Wanling, ZHANG Qi, ZHOU Xianglian. Dynamic Response of Marine Pile Foundation Under Combined Action of Wind and Wave Loads[J]. Journal of Shanghai Jiao Tong University, 2021, 55(9): 1116-1125.

图/表 11

图1

图2

图3

图4

表1

图5

图6

表2

不同条件下$u_{x,max}$和$u_{x,max} / u_{x0,max}$

条件	数值	u_x_,max/mm	$u x, max u x 0, max$ /%
W/(m·s^-1)	10	6.68	73.75
	15	9.05	100.00
	20	9.78	108.02
C'_D	0.1	5.39	59.52
	0.3	6.74	74.48
	0.5	9.05	100.00
H/m	2	3.99	44.07
	3	9.05	100.00
	4	10.61	117.16

表2

图7

图8

表3

不同条件下$M_{x,max}$ 和$M_{x,max} / M_{x0,max}$

条件	数值	M_x_,max/ (kN·m^-1)	$M x, max M x 0, max$ /%	条件	数值	M_x_,max/ (kN·m^-1)	$M x, max M x 0, max$ /%	条件	数值	M_x_,max/ (kN·m^-1)	$M x, max M x 0, max$ /%
W/(m·s^-1)	10	19282.63	72.63	C'_D	0.1	15341.25	57.78	H/m	2	11792.34	44.41
	15	26550.86	100.00		0.3	19561.70	73.68		3	26550.86	100.00
	20	28672.24	107.99		0.5	26550.86	100.00		4	31406.79	118.29

表3

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	参数	取值
风荷载	风速/(m·s^-1)	10,15,20
	风剪切系数	0.1,0.3,0.5
	空气密度/(kg·m^-3)	1.18
波浪荷载	水深/m	20
	周期/s	5
	波高/m	2,3,4
	波长/m	38.87
	体积模量/(kN·m^-3)	2×10⁹
海床土体	切变模量/(N·m^-2)	8×10⁶
	渗透系数/(m·s^-1)	0.01
	泊松比	0.25
	孔隙率	0.4
	土体密度/(kg·m^-3)	1.85×10³
	饱和度	0.98
单桩基础	密度/(kN·m^-3)	7.85×10³
	直径/m	6
	泊松比	0.25
	弹性模量/(N·m^-2)	2.7×10¹²

风浪荷载共同作用下的海洋桩基动力响应

Dynamic Response of Marine Pile Foundation Under Combined Action of Wind and Wave Loads

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