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破碎波作用下砂质海床孔隙水压力响应试验

ISSN号：1672-9331
期刊名称：长沙理工大学学报(自然科学版)
时间：0
页码：43-50
分类：TU411[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]长沙理工大学水利工程学院,湖南长沙410004, [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410004, [3]中交第二航务工程勘察设计院有限公司,湖北武汉430000
相关基金：国家自然科学基金资助项目（50909009,50979008,41176072）; 大连理工大学海岸和近海工程国家重点实验室开放基金资助项目（LP1004）; 教育部高校博士点基金资助项目（20094316110002）
相关项目：破碎波作用下沙质海床动力响应及其对泥沙运动的影响

关键词：破碎波, 超静孔隙水压力, 砂质海床, 水槽试验, beaking wave, excess pore water pressure, sandy seabed, flume experiment

中文摘要：

通过波浪水槽试验,研究规则波在1：30斜坡砂质海床上破碎时海床超静孔隙水压力响应规律,观察波浪破碎处的地形变化,并分析其形成原因.试验结果表明,在波浪破碎前后超静孔隙水压力有着明显的不同变化,破碎点处距底床表面最近的超静孔隙水压力值在整个过程中达到最大,且破碎带处超静孔隙水压力竖向衰减幅度均比破碎前、后要大,破碎点的超静孔隙水压力有明显增大;破碎前后超静孔隙水压变化与浪高变化呈正相关趋势,且破碎后两者的相关性没破碎前好;波浪破碎处地形变化剧烈,超静孔隙水压力在沙床顶部的变化较底部变化明显.砂层掏刷时,超静孔隙水压振幅变大;砂层堆积时,超静孔隙水压振幅变小.

英文摘要：

Based on the wave flume experiments,the response pattern of excess pore water pressure is studied on a 1∶30 slope sandy seabed under the regular breaking wave action.The topographic change is observed and its causes are analyzed in the broken wave zone.The results show that the excess pore pressure changes significantly and differently before and after wave breaking.The excess pore water pressure reaches the maximum on the area away from the nearest bed surface of the breaking point in the whole process,and the vertical decay rate of excess pore water pressure is larger than the before and after wave breaking in the broken zone.The excess pore water pressure increases significantly at the breaking point.Before and after the wave breaking,the change between excess pore water pressure and wave height has positive correlation trend,and the correlation is not very well after the wave breaking.The topographic change is great in the wave breaking zone.Excess pore water pressures changing at the top are significantly higher than it is at the bottom.When the sand scours,the amplitude of the excess pore water pressure increases.And when the sand accumulates,the amplitude of the excess pore water pressure decreases.

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