同济大学学报（自然科学版）2025，Vol.53Issue(10)：1535-1543,9.DOI:10.11908/j.issn.0253-374x.24188
非水相有机液体作用下上海黏性土的结构演化及渗透性
Structural Evolution and Permeability of Shanghai Clay Subjected to Non-Aqueous Phase Liquid
摘要
Abstract
Non-aqueous phase liquids(NAPL)have very low dielectric constant.Therefore,they can affect the electric double layer,as well as the physical and mechanical characteristics of clay.NAPL contamination has been frequently discovered in the coastal saturated clays formed during the Holocene transgression.To investigate the impact of NAPLs on soil structure and the contaminant transport in these coastal saturated clays,long-term soaking tests(up to 1.8 years)were conducted on intact saturated Shanghai clays(primarily composed of illite)using three NAPLs:kerosene,trichloroethylene(TCE)and kerosene-ethanol mixture.The results were also compared with those obtained from bentonite(primarily composed of smectite).Test results shown that under the long-term action of NAPLs,the Shanghai saturate clay exhibited shrinkage,cracking,and flocculation,but significantly less pronounced than in bentonite.The intensity of structural alteration follows the order of kerosene<kerosene-ethanol mixture<TCE.Except for the dielectric constant of NAPL,the velocity and amount of the free-phase NAPL infiltrating in the soil are also important factors influencing the structural alteration.Under the coupled impacts of shrinkage(decreasing in void ratio)and flocculation(decreasing in specific surface),the hydraulic conductivities of the Shanghai saturate clays are found to increase by up to two times.关键词
非水相有机液体/饱和黏性土/结构演化/浸泡试验/渗透性Key words
non-aqueous phase liquids(NAPL)/saturated clay/structural evolution/soaking test/permeability分类
建筑与水利引用本文复制引用
高彦斌,刘佳丹,李泳键,李韬,沈超..非水相有机液体作用下上海黏性土的结构演化及渗透性[J].同济大学学报（自然科学版）,2025,53(10):1535-1543,9.基金项目
国家自然科学基金(41772293) （41772293）
