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| Study on Engineering Geological Property of Q2 Overlapping Clay Soil in Ningxiang along Changsha －Yiyang Railway |
| WANG Ying － he，GUO Jian － hu，ZHAO Xin － yi，GAO Wei |
| China Railway Siyuan Survey and Design Group Co． Ltd，Wuhan，Hubei 430063，China |
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Abstract Research purposes: The Q2 overlapping clay soil is widely distributed in Ningxiang along the Changsha －Yiyang Railway and it is hardly found in other regions． To choose the proper method to treat this type of soil is the key problem because the subgrade settlement of intercity railway must be controlled strictly． Through the in － situ investigation，drilling exploration，in － situ test and indoor experiment，etc，the study is done on the soil＇s morphology and genesis，physical property，strength characteristics，deformation consolidation and expansive property to know the engineering characteristics of the overlapping clay soil for providing the reliable basis for the subgrade design．
Research conclusions: The overlapping soil is formed from the red clay caused by the effect of leaching and depositing under the warm and wet environment，and it is a typical unsaturated soil with void ratio being bigger than red clay and saturation degree always being less than 90%． The overlapping soil with high liquid limit and high liquidity index is a high liquid limit soil． This soil is generally in plastic － hard status with strong strength and its bearing capasity can reach to 200kPa in natural condition． The overlapping soil belongs to the medium compressible soil，and the compressibility of the overlapping soil in the low layer is bigger than the soil in the upper layer． This soil is a typical over － consolidated soil with the over consolidation ratio of surface soil up to 15． 4 and the overlapping soil belongs to weak expansive soil．
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Received: 10 June 2011
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2011, Vol. 28 
