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为了评价和分析天津滨海新区中心渔港吹填土的固化效果和工后沉降,将经真空预压处理与未经真空预压处理的2组土样进行了室内物理化学试验分析。同时,还对不同处理条件下的2组土样进行了压汞试验,利用分形理论对吹填土中的孔隙直径进行了区间的划分,并对比了2组处理条件下孔隙率的变化特征。研究结果表明:与未经真空预压处理的土样相比,真空预压处理后的土样含水量减小、易溶盐含量减少,土体的物理化学性质得到改善;2组吹填土样孔隙直径分布区间大致相同,主要集中在0.4~3.5μm区间内,0.04~0.4μm和3.5~35μm区间有少量分布,小于0.04μm以及大于35μm区间的孔隙分布基本很少;在距地表0~8m和25~50m深度范围内,经真空预压处理土样中的孔隙率小,固化效果较好;在距地表8~25m深度范围内,经真空预压处理土体中的排水通道阻塞,导致土样的固结过程受到了影响,孔隙率较大,固化效果较差。
In order to evaluate and analyze the curing effect and post-construction settlement of dredger fill in the fishing port of Binhai New Area in Tianjin, two groups of soil samples, pretreated by vacuum preloading and without preloading by vacuum preloading, were subjected to laboratory physical and chemical tests. At the same time, two groups of soil samples under different treatment conditions were also tested for mercury intrusion. The fractal theory was used to divide the pore diameter of the dredged soil, and the variation characteristics of porosity under two treatment conditions were compared. The results show that compared with the soil samples without vacuum preloading, the soil moisture content after vacuum preloading decreases, the content of soluble salts decreases, and the physicochemical properties of the soil are improved. The distributions of the pore sizes are roughly the same, mainly in the range of 0.4 ~ 3.5μm. There is a small amount of distribution in the ranges of 0.04 ~ 0.4μm and 3.5 ~ 35μm. The pore distribution in the range of less than 0.04μm and more than 35μm is very few; 8m and 25 ~ 50m depth range, the vacuum pre-pressure treatment of soil samples in the porosity is small, good curing effect; in the depth of 8 ~ 25m from the surface within the vacuum preloading treatment of soil drainage channel obstruction, As a result, the consolidation of soil samples is affected, the porosity is higher, and the curing effect is worse.