干湿循环对膨胀土变形指标的影响  

Wetting-Drying Cycle Influence on Expansive Soil Deformation

作　　者：赵艳林[1,2,3] 曾召田[2,3,4] 吕海波[1,2,3] 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西大学土木与建筑工程学院 [3]广西大学防灾减灾研究所,南宁530004 [4]南宁铁路局科学技术研究所,广西柳州545007

出　　处：《桂林工学院学报》2009年第4期470-473,共4页Journal of Guilin University of Technology

基　　金：国家自然科学基金资助项目(40702053);广西科技开发项目(桂科能0815011-6-4);广西水利厅科技专项(桂水科合字[2005]4)

摘　　要：对经历室内干湿循环后的膨胀土进行胀缩性试验，研究了胀缩变形指标的变化规律，结果表明：除缩限外，其余胀缩性指标随干湿循环次数的增加发生衰减，前1～3次循环时衰减速度较快，此后逐渐趋于一稳定值，循环次数与胀缩性指标可用指数关系拟合，缩限在干湿循环过程中不发生变化。Laboratory tests study change of swell-shrink properties of expansive soil in wetting-drying cycle and swell-shrink indices are calculated. It is shown that well-shrink indices except the shrinkage limit of expansive soil obviously decrease at the beginning of 1 to 3 wetting-drying cycles, and then tend to stable values. But the shrinkage limit maintains constant after wetting-drying cycles. The relationship between swell-shrink indices and wetting-drying cycle times can be fitted by exponential equation

关 键 词：膨胀土 干湿循环 变形指标 

分 类 号：TU443[建筑科学—岩土工程]