盐城港滨海港区高含水率淤泥水力渗透固结特性研究

The Hydraulic Permeability Consolidation Properties of Dredged Slurry with High Water Content in Binhai Port of Yancheng city

随着沿海开发上升为国家战略,航道疏浚,港口、船闸建设,围海造地等工程建设活动日益增多,在这些工程中均会产生大量的疏浚淤泥。采用水力渗透固结法对盐城港滨海港区高含水率淤泥的压缩渗透特性开展研究,试验显示,水力渗透固结方法可以有效的测试滨海港高含水率淤泥压缩特性及渗透特性。试验结果表明,由于滨海港淤泥位于在塑性图中位于A线以下,属于粉质土,所以目前关于粘性淤泥的压缩特性及渗透特性的预测方法不适用于滨海港淤泥。在e-logσ＇坐标系中,滨海港淤泥的孔隙比随有效应力呈线性变化关系。在lge-lgk坐标系中,滨海港淤泥的渗透系数随孔隙比呈线性变化关系。最后,提出了滨海港淤泥的孔隙比~有效应力及渗透系数~孔隙比关系的定量化描述方法。

According to the hydraulic permeability consolidation experiments conducted on the high water content mud which is collected from Yancheng Binhai Harbor, the curve in plastic figure is under curve A and Binhai mud can be recognized as silty soil. Hence, the available prediction formulas for compression and permeability are no longer practical. In order to find a proper way to identify the compression and permeability characteristic of Binhai mud, by looking at the e -logσ＇ coordinates, the relationship between void ratio for Binhai soil and ef- fective shear strength can be described in linear pattern. And the relation of void ratio and permeability are in linear as well in the lge - lgk graphic. Based on these two relationships, formula for predicting Binhai soil can be proposed