下蜀土-膨润土混合土的膨胀性试验及机理研究  

Experimental study and mechanisms of swelling properties of Xiashu-bentonite mixture

作　　者：顾凯[1] 施斌[1] 唐朝生[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210093

出　　处：《水文地质工程地质》2011年第4期125-129,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金重点项目(40730739)

摘　　要：下蜀土-膨润土混合土作为一种可选的衬垫材料,其膨胀性对城市垃圾卫生填埋场的安全性有重要意义。本文按不同的初始含水量(10%～20%)和膨润土掺量(5%～15%)共配制了9组混合土试样,并在不同的温度(30～50℃)条件下开展一系列无荷膨胀试验。试验结果表明:初始含水量是影响下蜀土-膨润土混合土膨胀的重要因素,初始含水量越高,试样膨胀性越小;混合土中膨润土掺量越高,膨胀性越大;温度对下蜀土-膨润土混合土的膨胀性也有重要影响,膨胀性随温度的升高增加,尤其对于膨润土掺量较高的试样,膨胀性的温度效应更明显。Xiasu-bentonite mixture is an alternative liner material,which plays an important role in the security of urban landfills.In this study,the swelling properties of 9 mixture samples with different initial water content（10% to 20%） and bentonite content（5% to 15%） were tested under different temperatures（30℃ to 50℃）.The results indicate that the initial water content is a significant factor influencing the mixture＇s natural properties.The swelling capacity decreases with increasing water content,and the number also increases with the increasing bentonite content.Furthermore,the swelling capacity increases as temperature rises.In particular,the temperature effect is more apparent for the samples with higher bentonite content.

关 键 词：下蜀土-膨润土混合土 膨胀性 初始含水量 膨润土掺量 温度 

分 类 号：P642.116[天文地球—工程地质学]