波浪加载下海底土质特性变化的研究

Study on the Geotechnical Behavior of Seabottom Sediments Under Wave-Loading

通过不同的制样方法 ,在水槽中模拟了多种海底在波浪作用下的变化行为。试验发现 ,加压排水固结的砂质粉土海底在波浪作用下较稳定 ;加压不产生排水而固结的砂质粉土海底易受波浪的冲刷 ;自然条件和轻微振动的砂质粉土海底最易受到波浪的扰动破坏 ,形成塌陷凹坑。粘粒含量较高的粉质粘土对波浪的反映不敏感 ;下卧软土层土体在上覆压力下的变形量与含水量关系密切 ,含水量越高 ,变形越大。试验结果证明 ,波浪会引起沉积物性质发生改变 ,也是引起海底形态变化的主要原因。

Exeriments made in a wave flume by using two seabed sediments simulated the geotechnical behavior of different soils under wave action. The flume experiments indicated that the response of seabed soils to wave action was controlled by soil structure:Wave-induced collapse was generated in sandy-silt which was natural or slightly vibrating. Soils under pressure and with drainage seemed to be more stable than those under pressure but without drainage, the latter could be scoured more easily;However, the silty-clay with high a clay content could slide under overloading if the water content was too high. The wave action would induce the variation of soil properties. The test suggested that wave action was the main factor inducing seabed morphological deformation too.