疏浚淤泥中的拱架结构防淤堵机理

透气真空快速泥水分离技术适用于高含水率高粘粒含量疏浚淤泥的堆场处理,可以快速减小堆场中淤泥的体积,加速堆场的周转利用,并能解决常规真空处理方法中存在的滤层淤堵问题。通过对透气真空快速泥水分离试验和常规真空抽水试验结束后进行试样取样颗粒分布试验,可以看出透气真空方法中滤层材料附近的淤泥土体中细颗粒流失,粗颗粒富集,形成拱架结构;而常规真空抽水方法中不存在细颗粒流失,没有形成拱架结构,造成了淤堵。分析了拱架结构层形成的过程,其能够保护土体内部的细颗粒不再流失,同时保证较高的渗透性。解释了常规真空抽水方法容易产生淤堵,而透气真空方法能够解决淤堵问题的原因。

The Mechanism Analysis of Anti-clogging Arching Structure in Dredged Sludge

A number of lands were occupied by discarding the dredged sludge in the yard as waste materials.The Aeration Vacuum rapid Mud-Water Separating（AVMWS） technique was appropriate for discarding yard with high water content and high clay particle content sludge.This technique could quickly reduce the volume of the sludge and accelerate the turnover use of the yard.In addition,the technique could overcome the clogging problem when pumping water from high water-content,high clay particle content dredged sludge.Through the sampling particle size distribution tests after AVMWS and conventional vacuum pumping model tests,it was found that in the AVMWS tests the fine-grained soil run off,coarse particles accumulated,and arching structure layer was formed.However,in the conventional vacuum pumping tests,fine particles did not lost and there was clogging without arching structure layer.The layer could protect the internal loss of the fine particles and ensure a high permeability of the soil at the same time.And the mechanism was explained as well.