摘要
黄河水下三角洲埕岛海区浅部地层自上而下主要有三种结构类型:厚层粉土-软弱粉质粘土型、薄层粉土-软弱粉质粘土层型和厚层软弱粉质粘土层-粉土或粉质粘土层型。具桩靴平台在研究区内进行插拔桩,扰动或破坏表层土,拔桩后形成桩坑。桩坑的恢复夷平和坑内回淤土层性质直接影响后期海洋工程进行。本研究利用浅地层剖面仪、声纳、野外钻探及室内实验等方法对桩坑内外土体的性质进行了探测。探测结果表明,三种类型底土在插拔桩后,回淤地层结构及其物理力学性质与原地层比较,有较大差异。
The shallow strata in the Yellow River subaqueous delta Chengdao sea area can be divided into three stractural categories, the category of thick silt-weak silty clay, the category of thin silt-weak silty clay and the category of thick weak silty clay-silt or silty clay. The pile insertion and pullout of platform with pile shoes in the study area disturbed and damaged the surficial soil, and the shoe pits were formed after pile pullout. The renewal of shoe pits and the characteristics of silted soil in the shoe pits will directly affect the subsequent marine engineerings constructed in the study area. In this paper, the subbottom profiler, side scan sonar, offshore drilling rig and indoor physicomechanical test were used to survey the characters of soil layers inside and outside the shoe pits, and it is shown from the survey results that after the insertion and pullout of platform piles, the structures and physicomechanical properties of silted soil in the shoe pits have changed greatly.
出处
《海岸工程》
2007年第2期11-18,共8页
Coastal Engineering
关键词
黄河三角洲
桩坑
扰动
恢复
Yellow River delta
shoe pit
disturbance
renewal
