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A Study on the Effects of the Coefficient of Uniformity and Porosity on the Soil-Water Characteristic Curves of Sandy Soils  

Yoo, Kunsun (Halla University Department of Civil Engineering)
Publication Information
Journal of the Korean GEO-environmental Society / v.14, no.5, 2013 , pp. 41-47 More about this Journal
Abstract
Well-graded and dense soils have good engineering properties. Unsaturated soil properties such as shear strength, compressibility and permeability are closely related to the soil-water characteristic curve of the soil. Therefore it is important to study the effects of the coefficient of uniformity and the porosity on the soil-water characteristic curve of the sandy soils, which are also related to the grain size distribution and the density of the soil, respectively. In this study soil-water characteristic curves (SWCCs) for six sandy soil specimens were investigated using Tempe pressure cells. The test data were best-fitted to Fredlund and Xing equation. The obtained fitting parameters and the characteristic points of SWCCs were discussed and correlated with the porosity and the coefficient of uniformity of the specimens. The results show that the smaller the porosity of the specimen becomes, the larger the value of the residual matric suction becomes, whereas the larger the coefficient of uniformity of the specimen becomes, the larger the value of the residual matric suction becomes. Regardless of the coefficient of uniformity, the smaller the porosity of the specimen, the flatter the max. slope of SWCC.
Keywords
Soil-water characteristic curve; Coefficient of uniformity; Porosity; Water content; Suction; Parameters;
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