Determination of soil2water characteristic curve of unsaturated expansive soils using filter paper method
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Abstract:
The water content of the soil varies randomly in reality. In this paper, the filter paper method was used to measure the total and matric suction of the unsaturated expansive soil under any cycle path, and the total suction curve and soil 2water charac 2 teristic curve ( SWCC) under any moisture change were obtained. The curve was fitted, and the capillary hysteresis internal vari 2 able model was used to calculate and validate the model applicability for expansive soils through the comparison of test and ob2 served results. Results showed that SWCC determined by the filter paper method is similar to that measured by the traditional methods, and the curve under any change in moisture content does not coincide with the full curve. Under the same moisture content, the smaller the difference between the moisture contents at the starting point of moisture elimination and absorption, the higher the matric suction which is from desorption to moisture, and the lower the matric suction which is from moisture to desorption. Capillary hysteresis internal variable model is suitable for the unsaturated expansive soil, which generates similar re 2 sults with the actual values.
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