2014, Volume 16, Issue 2
Strategic Study of CAE >> 2014, Volume 16, Issue 2
Experimental research on the mixed sand ratio and initial dry density of weathered sand improved expansive soil free load swelling rate
1. Collaborative Innovation Center of Geological Hazards and Ecological Environment in Three Gorges Area in Hubei Province，China Three Gorges University，Yichang，Hubei 443002，China；
2. Civil and Architectural Institute，China Three Gorges University，Yichang, Hubei 443002，China；
3. Yichang Transport Bureau, Yichang, Hubei 443002, China;
4. Yichang Highway Administration, Yichang, Hubei 443002, China
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Abstract
Through the indoor free load swelling rate test，Yichang City，a section of a highway reconstruction project of expansive soil were studied. Key analysis free load swelling rate of a non-load time，the proportion of mixed sand，the relationship between the initial dry density， experimental studies have shown that：Free load swelling rate is mainly divided into rapid expansion，slow expansion and eventually stabilize in three stages；during the initial dry density is constant，weathered sand soil free load swelling rate will increase the proportion of sand mixed with the rapid decrease slowly after the first lower，weathered sand soil modified free load swelling rate is not sensitive to the amount of sand mixed；in the same mixed sand ratio， weathered sand soil free load swelling rate increases with increasing initial dry density increases rapidly between them have a good linear correlation，expansive soil subgrade construction in progress when control of the initial dry density，to help reduce its swelling deformation，ensuring the stability of embankment.
Keywords
expansive soils ; weathered sand ; initial dry density ; mixing sand ratio ; free load swelling rate
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