广西崇上路击实膨胀土的变形特性试验研究  

Experimental Research on Deformation Characteristics of Compacted Expansive Soil on Chong-shang Highway in Guangxi

作　　者：郑柯[1] 梁翔[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中南公路工程》2006年第5期19-23,共5页Central South Highway Engineering

摘　　要：通过室内大量膨胀土试验,对广西崇(左)上(思)二级公路3种膨胀土击实土样的变形特性进行了研究。试验结果表明:膨胀土的起始含水量和起始干密度对其变形的影响是主要的外部因素;根据膨胀量试验、膨胀力试验和收缩试验的试验数据,得到了膨胀量、膨胀力和收缩量与起始含水量和起始干密度的相关关系。同时,研究了干湿循环对击实膨胀土膨胀特性的影响。研究结果为膨胀土的路基设计和路基处理等膨胀土问题提供了重要的依据。By a lot of laboratory tests of expansive soil,in the case of expansive soil on Chong-shang highway in Guangxi, the engineering deformation characteristics of three kinds of expansive soils have been test studied. The test results indicate： the beginning water content and dried density of expansive soil are the main outside factors that influence their deformation; the relation of swelling quantity,expansibility shrinkage quantity and beginning water content （dried density） is established based on the data of swelling quantity tests ,expansibility tests and shrinkage tests. At the same time, the wetting-drying cyclic swelling behavior of compacted expansive soil is discussed. Therefore, the study results have provided the important basis for the design of embankment and treatment technique to the existing expansive soil foundation.

关 键 词：击实膨胀土 变形 含水量和干密度 干湿循环 

分 类 号：U416.03[交通运输工程—道路与铁道工程]