真空作用下高含水率疏浚泥颗粒迁移规律试验研究  

Experimental investigation on particle migration behaviour of dredged clays with high initial water contents under vacuum pressure

作　　者：曾玲玲 王其忠 林晓鑫 ZENG Lingling;WANG Qizhong;LIN Xiaoxin(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Fujian Provincial Investigation,Design&Research Institute of Water Conservancy&Hydropower Co.,Ltd.,Fuzhou 350001,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023 [2]福建省水利水电勘测设计研究院有限公司,福建福州350001

出　　处：《岩土工程学报》2024年第8期1776-1782,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178361);江苏省南水北调科技研发项目(JSNSBD202205)。

摘　　要：研制了高含水率疏浚泥真空固结模型装置,针对两种具有不同液限的疏浚泥,开展不同初始状态下的真空固结试验,探究真空作用下疏浚泥初始状态对细颗粒迁移性状的影响规律。研究结果表明,引入初始含水率与液限比值作为无量纲化的初始状态指标,能够作为确定细颗粒迁移与否的一个临界阈值。当初始含水率与液限比值不大于临界阈值,真空作用下高含水率疏浚泥没有发生颗粒迁移;当初始含水率与液限比值大于临界阈值,真空作用下高含水率疏浚泥发生颗粒迁移,黏粒向排水面附近聚集。一旦发生颗粒迁移,黏粒向排水面附近富集的程度随着初始含水率与液限比值的增大而愈发显著。A vacuum consolidation model equipment is designed for performing a series of vacuum consolidation tests on two dredged clays with different liquid limits reconstituted at different initial water contents.The experimental results indicate that the ratio of the initial water content to the liquid limit is a useful dimensionless index for describing the behaviour of fine particle migration of dredged clays under vacuum pressure.It is found that there is a unique critical value of the ratio of the initial water content to the liquid limit for the occurrence of particle migration.When the ratio of the initial water content to the liquid limit is less than the critical value,the particle migration of dredged clays does not occur under vacuum pressure.But in the case that the ratio of the initial water content to the liquid limit is larger than the critical value,the particles of dredged clays migrate to the drainage surface,resulting in the enrichment of clay particles in the vicinity of the drainages.The level of clay particles enrichment increases with the increase in the ratio of the initial water content to the liquid limit.

关 键 词：疏浚泥 真空预压 颗粒迁移 液限 初始含水率 

分 类 号：TU411[建筑科学—岩土工程]