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http://dx.doi.org/10.7843/kgs.2007.23.10.57

The Shear Characteristics of Unsaturated Sandy Soils  

Lim, Seong-Yoon (Structure & Geotechnical Research Division Expressway & Transportation Technology Institute)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.10, 2007 , pp. 57-64 More about this Journal
Abstract
Since matric suction of unsaturated soil was related to soil and ground water contaminations, it is very important to analyze its mechanism that was represented by shear characteristics. In three phases of soil, a little air makes the condition of unsaturated soil on contract or shrinkage surface between water and air. Capillarity and suction in pore of unsaturated soil cause surface tension and surface force so it makes negative pore water pressure and increases effective stress as a result. Therefore, negative pore water pressure in partially saturated soil affects the soil structure and degree of saturation and it is important to evaluate accurately unsaturate flow and behavior. In this study, the shear strength characteristics of the seven sandy soils were investigated using consolidated drained triaxial tests with special emphasis on the effects of the negative pore pressure and the matric suction. These tests involved shearing under either a constant net confining pressure and varying matric suction or under a constant matric suction and varying net normal stress.
Keywords
Matric suction; Shear strength of unsaturated soils; Unsaturated soils;
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