清淤淤泥的固结特性试验研究  

Experiment on consolidation properties of dredged material

作　　者：周宣兆[1] 朱伟[1,2,3] 孙政[1] 

机构地区：[1]河海大学岩土工程科学研究所,江苏南京210098 [2]河海大学水资源高效利用与工程安全国家工程研究中心,江苏南京210098 [3]河海大学环境学院,江苏南京210098

出　　处：《水资源与水工程学报》2013年第1期69-72,共4页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(50979028);国家水体污染控制与治理科技重大专项(2012ZX07103-005)

摘　　要：太湖等湖泊开展清淤工程中产生的清淤淤泥常先放置于堆场,后经排水固结法处理为土地利用。设计处置方法前需了解淤泥固结特性,为预估沉降和固结速率提供参数。通过对固结仪进行改进,在满足对清淤淤泥进行固结试验的条件后,对3种不同初始含水率的清淤淤泥和1种重塑软土在小固结压力下进行试验,研究了清淤淤泥的固结特性和规律。结果表明:小固结压力下,清淤淤泥的压缩过程可用e-lgp曲线线性描述,压缩指数与初始含水率线性相关,清淤淤泥的固结系数随固结压力增加而增加(处于10-4cm2/s数量级),变化幅度较小,渗透系数极低(处于10-7 cm/s数量级)。Dredged material generated in sediment cleaning engineering of Tai Lake is usually placed in the storage yard and improved by drainage consolidation method before using in the projects.It is necessary to learn the consolidation properties of dredged material to predict settlement and consolidation rate.After improving the consolidometer,three kinds of dredged material with different initial water contents and one kind of remodeling soft soil were tested under low consolidation pressure to study consolidation properties.Test result shows that compression process of dredged material under low pressure can be described linearly by e-lgp curve,compression index of dredged material is affected markedly by initial water content.Coefficient of consolidation ascends in small range with the increase of consolidation pressure（about 10-4cm2/s） and coefficient of permeability is quite low（about 10-7 cm/s）.

关 键 词：清淤淤泥 固结 排水 固结系数 渗透系数 

分 类 号：S278[农业科学—农业水土工程]