高含水率疏浚淤泥混合固化轻质土试验研究

疏浚淤泥EPS颗粒混合轻质土是一种新型的轻质土工材料,具有密度小、强度高等特点,在工程中具有广泛的应用前景。本文对高含水率的白马湖疏浚淤泥进行了室内轻质土配比试验,系统分析了水泥掺量、EPS颗粒掺量以及养护龄期等因素对轻质土的密度及无侧限抗压强度这两个重要参数的影响规律。研究结果表明,轻质土的密度主要由EPS颗粒掺量控制,而水泥掺量和养护龄期对轻质土的密度影响较小;轻质土的强度受水泥掺量、EPS颗粒掺量和养护龄期的影响,其强度随龄期与水泥掺量的变化规律与一般水泥土一致,而强度与EPS颗粒掺量之间存在一个阈值。

Laboratory Tests on Cemented Bead-treated Lightweight Soils from High-water-content Dredged Sludge

The bead-treated lightweight soil made from dredged sludge is a new kind of geo-materials with light density and high undrained shear strength. It can be used widely in civil engineering, highway engineering, etc. In this study, the dredged sludge of Baima Lake, beads and cement （32.5 # ） are used to make the mix proportion researches, and two key parameters of the lightweight soil （the density and the unconfined strength） at different cement dosages, EPS volume dosages and curing periods are discussed. The results show that the density of the lightweight soils is mainly influeneed by the EPS volume dosage, while the strength is influenced by all the factors including the cement dosage, EPS volume dosage and curing period. It is emphasized that the relation between the strength and the cement dosage and curing period is similar to the common cemented soils, and there is a threshold of EPS volume dosage for the strength.