基于离心机法研究固化淤泥的土水特征曲线

摘要

为了研究疏浚淤泥固化处理后作为土工材料时保持水分的能力，利用离心机法快速量测了不同水泥掺量及龄期下固化淤泥的土水特征曲线，提出了修正后的吸力计算公式，试验结果表明：水泥的掺入使得淤泥中低势能的自由水转化到水泥水化产物中，随水泥掺量的增大，固化淤泥的持水能力不断增强；养护龄期越长，水泥水化反应越充分，固化淤泥进气值增大，土水特征曲线排水阶段的斜率减小，28 d 与56 d 的进气值差别不大，说明龄期对固化淤泥土水特征曲线的影响逐渐趋于稳定。%The soil-water characteristic curve of the solidified dredged material (DM) with different cement contents and curing ages was measured by centrifuge to study its water retention when it severed as civil engineering materials ,and the revised formula of suction was put forward .The test results show that the hydration reaction transfers the free water to high potential water in cement hydration resultants ,and the water-holding capacity of the solidified DM increases with the increasing of cement content .For sufficient hydration reaction ,the air-entry values increase with the increasing of curing age ,but the gradients of soil-water characteristic curves decrease with the increasing of curing age .There is so little dif-ference between the air-entry values of 28 days and 56 days ,it is shown that the influence of curing age on the water-holding capacity of the solidified DM tends to be stable .