| With the growth of our country's economy, regarded as the important component of infrastructure construction, the highway system has attracted the country's high attention. Road construction is developed unprecedentedly and the highway construction speed is more remarkable. With the development of the highway, problems met in engineering construction are increasing day by day too. Expansive soils are abundantly distributed in our country, especially in Sichuan, Hubei, Shanxi and Yunnan province. Because expansive soils contain many clay minerals which are very sensitive to water, expansive soils undergo relatively volumetric changes when the soil swells as it absorbs water or shrinks when it dries. The soil's characteristics lead to its large intensity reduction and cause enormous damage. Because expansive soils are very sensitive to water, some measures must be taken in engineering projects. During road constructions, widely used treatment methods for expansive soil roadbeds are the modified treatment and the wrapping method which can change the soil's physical and chemical properties or isolate the soil to water. When the wrapping method is used, the cushion's material is usually sand or modified soil.Aiming at the capillary phenomenon in expansive soils'roadbeds, GEO-SLOPE was used to simulate and analyze the capillary water's ascending height of soil columns in the presence of a water table. Then, some conclusions about the capillary water movement were drawn by changing the cushion's height. Meanwhile, some relevant experiments were conducted to observe the movements of capillary water in soil columns. By the experiment data, some conclusions were discussed.The present study is an attempt on the curve fitting of the SWCC. Based on the SWCC data in GEO-SLOPE, the SWCC curve was fitted by MATLAB. The suction value of each point on the curve was obtained by programming to estimate the capillary water moving height which needs further research.
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