干湿循环路径对红粘土胀缩特性的影响  

The Influence of Dry-Wet Circulation Path on Swell-Shrink Characteristics of Red Clay

作　　者：李振 陈开圣[1] 

机构地区：[1]贵州大学土木建筑工程学院,贵州贵阳550003

出　　处：《贵州大学学报（自然科学版）》2017年第5期115-119,共5页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目(51368010;51668011);贵州省科技支撑计划项目(黔科合支撑[2016]2005);贵州大学研究生创新基金项目(研理工2017032)

摘　　要：为研究红粘土在不同干湿循环路径下的胀缩变形特性,以贵州红粘土为研究对象,在先干后湿及先湿后干两种路径下运用常规膨胀仪对其进行了胀缩试验。试验结果表明,两种循环路径下,红粘土胀缩变形均不可完全恢复。第一次循环中,绝对膨胀率急剧增大,相对膨胀率则大幅减小,并随压实度增大而增大,先湿后干路径下试样胀缩率、绝对膨胀率和相对膨胀率均大于先干后湿路径,这种现象随循环次数发展逐渐减弱。In order to study the swell-shrink deformation characteristics of red clay under different circulation paths, the repeated swell-shrink tests on Red clay in Guizhou were carried out using the conventional dilatometer prior under two circulation paths of dry-wet and wet-dry. Test results show that the swell-shrink deformation under two kinds of path cannot recover completely. During the first cycle,absolute inflation increased sharply and rela-tive inflation rate fell dramatically, they increase along with the increase of degree of compaction, and the swell-shrink characteristics、absolute expansion rate and relative inflation rate under wet-dry circulation path is obvious-ly higher than the other path, then this kind of phenomenon gradually reduce along with development cycle times.

关 键 词：干湿循环路径 红粘土 胀缩特性 

分 类 号：TU446[建筑科学—岩土工程] TU441.34[建筑科学—土工工程]