黄河水下三角洲沉积物强度变化原位测试研究

研究区位于1964～1976年黄河由刁口入海时形成的水下三角洲叶瓣上。1995年为石油开采在潮坪上构筑的交通设施对波浪形成良好的屏障。在屏障两侧各选一典型研究区，于1999年和2002年进行了大量对比性现场原位土工测试，探讨了波浪对黄河口沉积物的次生改造作用，结果表明：(1)较强的波浪荷载作用，不会提高海底沉积物的表层强度，只是导致不均匀程度随水动力作用的时间增长有所加大：(2)较强的波浪荷载作用，使得海底表层沉积物之下一定深度范围内土体强度提高，形成强度硬层：(3)海底沉积物强度沿着剖面线在平面上呈现周期性或间隔性变化。

Intensity variation of sediments due to wave loading on subaqueous delta of Yellow River

The study area lies in the tidal flat of an abandoned subaqueous delta-lobe which came into being between 1964 and 1976. In 1995, for oil-exploit there was a road built parallel to coast in sea along the intertidal zone to be formed a wave barrier against with the wind-wave. Lots of comparable cone portable penetration tests in situ were conducted on the case study in 1999 and 2002. A series of interesting phenomena and innovative realizations were obtained about the wave-induced intensity-change of seabed sediment: (1) The stronger wave loading did not enhance mean surficial sediment-strength; the heterogeneity appeared increasing with time. (2) The stronger wave loading brought out hard layer in some depth under the skin sediment. (3) The intermittent (interval) variations of seabed soil intensity along the sections were found.