Study of Sedimentation and Consolidation of Soil Particles in Dredged Slurry
Study of Sedimentation and Consolidation of Soil Particles in Dredged Slurry
复制标题
DOI：
10.1061/9780784413432.008
复制
发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
N. Zhang;Wei Zhu
中科院分区：
文献类型：
--
作者：
N. Zhang;Wei Zhu
疏浚淤泥中土颗粒的沉降固结规律不明确，是一个非常复杂的问题。本研究采用了一种改进的实验方法--多层抽取取样法。首先确定土壤颗粒的体积分布，然后利用体积通量函数法计算不同粒径组土壤颗粒的平均速度。结果表明：疏浚泥中土颗粒的沉降固结过程存在三个不同的区域;它们分别是受阻沉降区、絮体压缩沉降区和固结区。在初沉期的第一个小时和随后的6个小时内，土壤颗粒的速度远小于受阻沉降区斯托克斯方程计算的速度。絮体压缩沉降区和自固结区的土颗粒不存在相对位移。这两个地带的土壤颗粒都属于沉积物。实验中絮体压缩沉降区的密度约为1.04g/cm 3。
Sedimentation and consolidation of soil particles in dredged slurry is very complex since the rule of it is not explicit. A modified experiment method called multilayer extraction sampling is adopted in this study. The volume distribution of soil particles can be determined first and the average velocity of soil particles for different size group of soil particles is calculated using volumetric flux function method. The result reveals that: there are three different zones existing during the sedimentation and consolidation of soil particles in dredges slurry. They are hindered settling zone, flocs compression settling zone and consolidation zone. During the first hour and the following 6 hours of preliminary sedimentation period, the velocity of soil particles is much smaller than the velocity calculated from Stokes equation in hindered settling zone. There is no relative displacement of soil particles in flocs compression settling zone and self-consolidation zone. All soil particles in these two zones belong to the sediments. The density of flocs compression settling zone is about 1.04g/cm 3 in the experiment.