膨胀土用作路基填料的分类指标体系研究  

Classification of expansive soils used as embankment fills

作　　者：杨和平[1] 赵鹏程[1] 郑健龙[1] 

机构地区：[1]长沙理工大学道路结构与材料交通行业重点实验室,湖南长沙410076

出　　处：《岩土工程学报》2009年第2期194-202,共9页Chinese Journal of Geotechnical Engineering

基　　金：交通部西部交通建设重点资助项目(2002318000)

摘　　要：交通部西部"膨胀土路基设计、加固与施工技术研究"项目课题组在不同地区用不同胀缩等级膨胀土直接修筑了多段路堤实体工程已取得成功经验,为促进这种处治新技术的推广并保证路基的强度和稳定性,必须建立与之配套的填料分类指标体系。为此,依据室内大量的膨胀土路用性能试验结果,归纳总结已有的实体工程修筑经验,遵循继承与创新相结合的原则,探讨采用改进的CBR试验强度、CBR膨胀量以及稠度三项指标建立膨胀土路堤填料分类指标体系,并对三种典型膨胀土开展了相关指标的试验验证。结果表明:该体系真正反映了膨胀土的本质特征及作为填料的工程特性,且指标参数的获取测试简便、快捷,能大大拓宽膨胀土用作填料的使用范围,可供编制路基新规范和工程师们进行膨胀土路堤设计与施工时参考。The research group of proiect ＂Research on design, stabilization and construction technology of expansive soil subgrade＂ sponsored by Chinese Ministry of Communications has successfully built several trial embankments in some areas by directly using expansive soils with different swelling potentials and achieved valuable experience. In order to promote the application of the new technology and ensure the strength and the stability of the subgrade, it is necessary to establish the classification of expansive soils used as fills. Based on numerous laboratory results of engineering properties of expansive soils, summarization of the experience in building trial embankments with expansive soils and criticism of some old classification indices, a new classification of expansive soils used as embankment fills is put forward by use of three indices-CBR strength, swelling rate of CBR samples in modified CBR tests and consistency. The corresponding indices are verified through tests on three kinds of typical expansive soils~ It is shown that the new classification can reflect the basic characteristics of the expansive soils and the engineering properties of embankment fills. Furthermore, it is very easy and convenient to obtain these indices, so that the application of expansive soils used as embankment fills can be enlarged, theses indices may be and provide engineers with references in the design and construction of expensive soil embankments.

关 键 词：膨胀土 填料分类 指标体系 改进CBR CBR膨胀量 稠度 

分 类 号：TU443[建筑科学—岩土工程]