Research purposes:The Q2 vermicular red clay was widely distributed along the Changsha -Yiyang railway where soil thickness is 5 ~30 m.It is the key problem to choose proper method to treat this type of soil because the settlement of intercity railway subgrade must be controlled strictly.Based on the site survey,particle -size analysis, chemical component analysis,X -ray spectrometry analysis and microstructure,the material composition,structure and genesis of the Q2 vermicular red clay were studied systematically,which can provide a reference to choose the foundation treatment method. Research conclusions:(1 )The clay was the preponderant particle in which the content was about 65% in the soil of Ningxiang,and the red soil contained more clay than the white soil.(2)The most component was SiO2 ,the next was Al2 O3 and TFe2 O3 ,and the three materials were more than 85% in the soil.(3)The iron element of the red soil is triple that of the white soil.(4)The framework of the white soil was schistose,and the contact between particles mainly contained surface -surface and surface -line contact.(5)The framework of the red soil was more inordinate.(6)The vermicular red clay was not formed in onefold climate,and underwent multistage climate,so it was a kind of compound paleosoil.(7)This research result provided references to the genetic study of vermicular red clay.
vermicular red claychemical analysisX -raymicrostructure
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