非饱和膨胀土非线性流变特性试验研究  

Experimental Study on Non-liner Rheological Characteristics of Unsaturated Expansive Soils

作　　者：肖宏彬[1] 范志强[1] 张春顺[2] 滕珂[1] 许豪[1] 

机构地区：[1]湖南工业大学岩土工程研究所,湖南株洲412008 [2]中南大学土木建筑学院,湖南长沙410075

出　　处：《公路工程》2009年第2期1-5,26,共6页Highway Engineering

基　　金：湖南省教育厅重点资助项目(07A017);湖南省科技厅资助项目(2007FJ3077)

摘　　要：针对广西南宁膨胀土进行了一系列室内试验研究,探讨了非饱和膨胀土非线性流变特性。试验结果表明:分别加载、分级加载试验及考虑预压荷载的压缩试验中应变-时间曲线有相同的趋势:在小应力时,土体呈现一定的线性变形,在较大应力时曲线均可拟合成对数形式;预压处理对消除工后沉降有利;影响应变的最大因素是含水量,其次为密实度,最后为竖向应力。On the basis of a series of indoor tests for unsaturated Nanning expansive soils, non-liner rheological characteristics of the expansive soils have been researched. The results shown that the strain-time curves have the same trend under loading, step-loading and preloading, the soil shows linear deformation under small stress, and the strain-time curves can be fitted in logarithm form under large stresses; preloading can effectively reduce the settlement; the most sensitive factor in controlling the strain is water content, then is the density, and the last is vertical stress.

关 键 词：非饱和 膨胀土 非线性 蠕变 

分 类 号：U416.03[交通运输工程—道路与铁道工程]