摘要
海床在波浪作用下是否稳定对海底工程的安全至关重要,海床的稳定性与土体中的孔压响应密切相关。水槽模拟试验表明:在波浪的作用下,黄河三角洲粉土海床中将产生振荡孔隙水压力和累积孔隙水压力。振荡孔隙水压力大小与土层深度、波高和粘粒含量有关,其振幅(能量)在土层中随深度的增加呈指数衰减,且粘粒含量越高衰减越快;加载波高越大,能量衰减越快。而累积孔压响应模式表现为在波浪作用最初的一段时间内,孔隙水压力快速上升,然后逐渐减小而趋于稳定,其大小和速率也与波高、粘粒含量、土层埋深有关,粘粒含量越高,孔压累积速度越低。
The stability of the seabed under wave conditions is very important to the safety of submarine engineering. It can be assessed based on the analysis of pore pressure variation with time. A flume experimental study indicates that water waves propagating over the seabed can generate significant oscillatory and progressive pore water pressure in the silt seabed. The amplitude of oscillatory pore pressure is relative to the depth of buried soil layers,the wave height and the clay content,which will attenuate according to index with increasing of soil layers＇ depth and attenuate faster with higher clay content, Wave energy in those soil layers with higher wave height will decrease more rapidly. The response mode of progressive pore pressure in the silt seabed is that it will increase fleetly at the initial stage of wave action,then decrease gradually to stabilization. It is relative to the depth of buried soil layers,the wave height and the clay content,too. The progressive velocity of pore pressure will reduce when clay content increases.
出处
《海洋通报》
CAS
CSCD
北大核心
2012年第1期15-20,共6页
Marine Science Bulletin
基金
国家重大科学研究计划(2010CB951202)
山东省自然科学基金(Y2007E08)
关键词
波浪
粉土海床
孔压
累积
衰减
wave
silt seabed
pore water pressure
progressive
attenuate
