波浪作用下斜坡上单桩周围海床孔隙水压力响应特性试验研究  

Experimental study for wave-induced pore water pressure response characteristics on slope seabed around monopile foundation

作　　者：郑余伟 程永舟[1,2] 李典麒 黄筱云 吕行[1] ZHENG Yuwei;CHENG Yongzhou;LI Dianqi;HUANG Xiaoyun;LYU Xing(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment and Water Disaster Prevention of Hunan Province,Changsha 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114

出　　处：《海洋通报》2023年第3期343-351,共9页Marine Science Bulletin

基　　金：国家自然科学基金(52071031,51679015);大连理工大学海岸和近海工程国家重点实验室开放基金(LP21V3);湖南省水利科技资助项目(XSKJ2021000-44)。

摘　　要：单桩基础周围斜坡海床中的波致孔隙水压力响应与纯斜坡海床存在较大差异。为了解不同波高、波周期条件下,单桩基础周围波浪传播变形及其对斜坡海床孔压振荡响应的影响,在波浪水槽末端铺设了长6 m、坡度1∶16的斜坡砂床进行试验。通过改变桩身位置和波浪参数,测量斜坡段各处波面形态,采集单桩周围孔隙水压力,分析了桩身位置及波浪参数对斜坡海床孔压响应的影响。结果表明:相同入射波条件下,随距坡脚水平距离增加,波高、近底流速和桩周孔隙水压力幅值都随之增大;桩周孔隙水压力幅值分布规律为:桩前孔压幅值明显大于桩侧与桩后孔压幅值。当Keulegan-Carpenter数大于6时,随着波高和波周期增大,马蹄涡产生的负压区使得桩侧海床孔隙水压力与纯斜坡海床孔隙水压力差值迅速增加。The wave-induced pore water pressure response around monopile foundation on a sloping seabed is quite different from that of a flat slope seabed.In order to understand the wave propagation deformation around the monopile foundation and the effect on the pore pressure oscillation response at the surrounding sloping seabed under different wave heights and wave periods,a slope sand bed with a length of 6 m and a slope of 1:16 was laid at the end of the wave flume for experimental test.By changing the position of pile and wave parameters,the wave surface morphology was measured and the pore water pressure around the monopile was collected.The effects of pile position and wave parameters on the pore pressure response on the sloping seabed were analyzed.The results show that under the same incident wave condition,wave height,the water mass point velocity near seabed surface and pore water pressure amplitude increase with the increase of horizontal distance from slope toe.The amplitude distribution of pore water pressure around the pile is as follows:the amplitude of pore pressure in front of the pile is obviously larger than that of pore pressure on the side and behind the pile.When the Keulegan-Carpenter number exceeds 6,the pore water pressure difference between pile side and flat slope increases significantly with the wave height and wave period rises due to the negative pressure area generated by the horseshoe vortex.

关 键 词：斜坡海床 单桩基础 孔隙水压力 波浪浅水变形 

分 类 号：P753[交通运输工程—港口、海岸及近海工程] TV139.2[天文地球—海洋科学]