New Prediction Model for SWCC of Expansive Soil Considering Drying and Wetting Cycles
Ma Shaokun1, Huang Xiao1, Duan Zhibo1, Ma Min1, Shao Yu2,3
1College of Civil Engineering and Architecture, GuangXi University, Nanning, Guangxi, China
2Guangxi Xinfazhan Communications Group Co., Ltd, Nanning, Guangxi, China
3Guangxi Road and Bridge Engineering Group Co. Ltd, Nanning, Guangxi, China
Keywords: Drying and wetting cycles, soil-water characteristic curve, predictive model, Nanning expansive soil
Abstract
The structural characteristics of expansive soil is susceptible to repeated drying and wetting cycles caused by seasonal periodical changes. In this paper, the characteristics of Nanning expansive soil were studied,and the soil-water characteristic curves of Nanning expansive soil under multiple drying and wetting cycles were obtained by adopt several known equations. Furthermore, a new prediction model considering two factors was proposed basing on the Van Genuchten model. The new model overcomes the shortcomings of the previous model which considers only matrix suction. It can reasonably consider 2 factors including the matrix suction and the number of drying and wetting cycles. The model can establish a general equation for the soil-water characteristic curve with the same fitting parameters in comparison with the previous model, which can greatly reduce workload of the measurement. In addition, the application of the improved model was broadened by comparing the fitting results and test data of expansive soils of Nanyang and volcanic ash soil.
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