The influence of swelling potential grade, water content and drydensity on California Bearing Ratio (CBR) of expansive soils from Jingmen, Chinawas studied and empirical formulas describing the relationship of CBR value, drydensity and the compaction degree of soil were derived. It is found that the CBRvalues depend on the water content, the dry density and the structural state aftersoaking expansion, and its variations with the water content, compaction effort andswelling potential grade are similar to the compaction curves. The water content ofthe maximum CBR is usually higher than the optimum water content and thisdifference decreases as the compaction effort decreases. It is concluded that the watercontent for expansive soil for subgrade construction control should be slightly higherthan the optimum water content and lower than the plasticity limit, while the drydensity should be slightly lower than the maximum dry density.
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