太湖每年会产生大量的弃置疏浚泥，为实现固体废弃物资源化利用，探索将疏浚泥与凹凸棒土制备成垂直屏障材料的可行性，并对其抗渗特性开展了研究。通过柔性壁渗透、水分离心以及低场核磁共振试验等多种测试方法，对疏浚泥-凹凸棒土工程屏障材料的抗渗性能及其微观孔隙结构进行研究。结果表明：随着固结压力的提高，疏浚泥-凹凸棒土屏障材料中的小孔比例增加、介孔比例减小、自由水含量下降、结合水含量基本不变，宏观上表现为疏浚泥-凹凸棒土的孔隙率与渗透系数随固结压力的增加逐渐降低；在100 kPa的固结压力时，与水为渗透液的试验相比，采用氯化锌与丁酸为污染渗透液的疏浚泥-凹凸棒土屏障材料的孔隙率与渗透系数均升高，原因是污染液的加入使得疏浚泥-凹凸棒土的小孔比例减小、介孔比例增加、自由水含量上升，结合水含量基本不变。

A large amount of dredged silt is produced in Taihu Lake every year. In order to realize the resource utilization of solid waste, the feasibility of preparing dredged mud and attapulgite into vertical cutoff wall material was explored, and its impermeability was studied. The permeability resistance and micro-pore structure of dredged mud-attapulgite engineering cutoff wall materials were studied by flexible wall infiltration, water centrifugation and low field nuclear magnetic resonance test. The results show that with the increase of consolidation pressure, the proportion of small holes increases, the proportion of mesoporous holes decreases, the content of free water decreases, and the content of bound water is basically unchanged, and the porosity and hydraulic conductivity of dredged silt-attapulgite decrease gradually with the increase of consolidation pressure. At the consolidation pressure of 100 kPa, the porosity and hydraulic conductivity of the dredging silt-attapulgite cutoff wall material using zinc chloride and butyric acid as the contaminated permeate increase compared with the test using water as the permeate. The reason is that the addition of the polluted permeate reduces the small hole proportion, increases the mesoporous proportion, increases the free water content, and basically keeps the bound water content unchanged.