波浪作用下黄河口粉土海床粗化室内模型试验研究

In-lab experimental study on coarsening of seabed silty soil of the Yellow River Estuary

利用室内水槽模型实验,对黄河口粉质海床土在波浪荷载下的粗化现象进行了研究,试验中观测了土体表层沉积物的变化,测量了土体内孔隙水压力及土的粒径变化,结合高密度电阻率法探测结果分析探讨了波浪作用下土体粗化机理。研究表明,波浪作用会使粉质海床土发生明显的粗化现象;土体液化是波浪导致粉土粗化的首要条件;土体内超孔隙水压力累积及消散是细颗粒物质迁移的主要动力。该结果对于研究黄河口粉土海床地貌的形成有一定参考意义。

With in-lab flume model experiments, coarsening of seabed silty soil of the Yellow River Estuary is studied under wave actions. In the experiments, changes in soil grain composition and pore water pressure are monitored and analyzed, and mechanism of the process is discussed with the combination of geophysical methods and numerical analyses. The analytical results show that shearing action of waves and seepage field induced by non-uniform distribution of pore water pressure lead to coarsening a the seabed soil, i. e. , its mean particle diameter increases, and its clay content decreases. The results have a special reference to the stability study of silty seabed of the Yellow River Estuary.