复合污染作用下膨润土的防渗性能研究*陈宏信1,潘鸿诚1,尹泽豪1,闵欣愉1,石福江1,高亮2,3(1.同济大学土木工程学院地下建筑与工程系,上海200092;2.澳门大学智慧城市物联网国家重点实验室,澳门999078;3.澳门大学土木与环境工程系,澳门999078)【摘要】复合污染是实际工程中常见的污染类型,膨润土基防污屏障是阻滞污染物运移最有效的方式之一。为探究复合污染对膨润土防渗性能的影响,开展了自由膨胀试验及扫描电子显微镜(SEM)试验,研究不同组合、不同浓度的Cu2+、Pb2+和醇类复合污染作用下膨润土防渗性能的变化规律以及微观影响机制。试验结果表明:在同一价态重金属复合污染作用下,膨润土防渗性能主要与溶液中重金属总浓度相关,受重金属种类的影响较小;在重金属-乙醇复合污染作用下,随重金属总浓度的增大,乙醇对防渗性能具有促进作用的浓度区间减小,促进作用效果减弱,最终表现为抑制作用。【关键词】自由膨胀试验;复合污染;钠基膨润土;防渗性能中图分类号:X53;TU443文献标识码:A文章编号:1005-8206(2023)01-0063-06DOI:10.19841/j.cnki.hjwsgc.2023.01.010StudyofAnti-seepagePerformanceofBentoniteundertheInfluenceofCompoundPollutionCHENHongxin1,PANHongcheng1,YINZehao1,MINXinyu1,SHIFujiang1,GAOLiang2(1.DepartmentofGeotechnicalEngineering,CollegeofCivilEngineering,TongjiUniversity,Shanghai200092;2.StateKeyLaboratoryofInternetofThingsforSmart,UniversityofMacau,Macao999078;3.CivilandEnvironmentalEngineer⁃ing,UniversityofMacao,Macao999078)【Abstract】Compoundpollutionisoneofthemostcommonpollutiontypesinengineeringpractices.Bentoniteanti-foulingbarrierhadbeenwidelyusedtopreventthemigrationofcontaminants.Inordertoinvestigatetheinfluenceofcompoundpollutionontheanti-seepageperformanceofbentonite,thefree-swellingtestandscanningelectronmicroscope(SEM)testwereconducted.Thevariationoftheanti-seepageperformanceofbentoniteandthemicroscopicinfluencemechanismunderthecombinedpollutioneffectsofdifferentcombinationsandconcentrationsofCu2+,Pb2+andalcoholswerestudied.Theresultsshowedthatforthecompoundpollutionofdifferentmetalionswiththesamevalence,theanti-seepageperformanceofbentonitewasmainlyrelatedtothetotalconc...