水泥-磷石膏双掺固化处理高含水率疏浚淤泥试验研究

在传统水泥固化处理方法的基础上，提出用水泥-磷石膏双掺固化处理高含水率疏浚淤泥的方法，以期达到以废治废，将废弃高含水率疏浚淤泥经济合理转化为良质土资源的目的。系列室内试验的结果表明，磷石膏对疏浚淤泥固化土的增强效果显著，并存在一最佳掺量，最佳掺量随淤泥初始含水率增大而增大，水泥-磷石膏双掺固化土的应力-应变曲线表明，其破坏应变一般在2%～3%左右，变形系数E50与抗压强度近似呈线性递增关系。

Experimental study of solidification of dredged clays with high water content by adding cement and phosphogypsum synchronously

How to treat dredged clayey soils with high initial water contents is an important issue in engineering practice. A new solidification method by adding cement and phosphogypsum synchronously is proposed based on traditional cement-treatment method. A series of laboratory tests were performed on the treated soils. The experimental results show that the unconfined compressive strength of solidified soils increases remarkably by adding cement and phosphogypsum synchronously compared with those treated only by cement. There is an optimum addition content of phosphogypsum for solidification treatment. The optimum addition content increases with the increase of initial water content of dredged clays. The stress-strain curves of solidified soils indicated the range of the failure strain about 2%-3%. The relationship between E50 and strength is nearly linear.