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| Research on the Characteristic and Genesis of Q2 Vermicular Red Clay in Ningxiang of Changsha - Yiyang Railway |
| WANG Ying – he |
| (China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063 , China) |
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Abstract 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 Al2O3 and TFe2O3, and the three materials were mor^ 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.
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Received: 04 July 2015
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2015, Vol. 32 
