中文摘要：

围绕南宁膨胀土能否直接用作路堤填料问题,系统开展了该类膨胀土的各种土性和路用性能试验研究。通过详细整理测试数据、系统分析试验成果,全面对照膨胀土路堤物理处治技术中新的填料分类指标体系,从路基填料的强度、变形和施工可碾压性3个方面逐一展开分析论证。结果表明：除一处土样天然稠度不满足要求外,其余南宁膨胀土均可直接用来填筑外环公路的下路堤;所得结果为该段路基实施物理处治方案设计提供了理论依据和参数。

英文摘要：

The various soil property testing and road performance testing were carried out to determine whether Nanning expansive soil could be directly used as embankment filler or not.In terms of testing results and the new classification criteria system of expansive soil used as embankment filler,the analysis demonstrations were performed on the strength,deformation and compactibility of subgrade filler.The results show that all the expansive soils can be directly used to fill the subgrade of Nanning expansive soil except one whose consistency does not satisfy the requirement.The theoretical basis and design parameters got by the results are provided for implementing the physical treatment plan of the subgrade.