基于压汞法的水泥固化淤泥持水特性研究

摘要

The study on water retention property of cemented dredged material ( DM) is presented. Soil water characteristic curves ( SWCCs) of cemented DM with different initial water contents and cement contents were measured by filter paper methods and pore size distributions were measured by mercury intrusion porosimetry ( MIP ) . Water holding capacity of the cemented DM was discussed and the measured pore size distributions were used to predict the SWCCs of cemented DM. The test results show that water holding capacity of the cemented DM increases with increasing of the cement content for given initial water content and it decreases with increasing initial water content for a given cement content. Pore size distribution of cemented DM is unimodal. The predicted SWCCs are consistent with the measured curves if no remarkable drying shrinkage occurs. On the other side, the predicted SWCCs are higher than the measured curves for specimens subjected to remarkable drying shrinkage.%为深入探究固化淤泥的持水特性，通过试验量测不同初始含水率和水泥添加量下固化淤泥的土水特征曲线，基于压汞试验获得其孔径分布曲线，分析固化淤泥的持水特性并据其孔径分布预测了土水特征曲线。结果表明：同一初始含水率条件下固化淤泥的持水能力随水泥添加量的增加而增强，相同水泥添加量下其持水能力随初始含水率的增加而减弱；固化淤泥的孔径分布曲线呈单峰，若其在干燥过程中不发生收缩或收缩较小，则据孔径分布预测的土水特征曲线与实测曲线吻合较好，否则，预测的土水特征曲线高于实测曲线。