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The Influence of Overburden Pressure and Volume Change on the Soil-water Characteristic Curve of Unsaturated Weathered Granite Soil  

Lee, Younghuy (영남대학교 건설시스템공학부)
Kim, Taehan (영남대학교 건설시스템공학과)
Moon, Seokjun (영남대학교 건설시스템공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.11, no.5, 2010 , pp. 53-60 More about this Journal
Abstract
The comprehensive tests on unsaturated weathered granite soils are carried out to obtain the soil-water characteristic curve that is the one of the essential requisites to study the unsaturated soil. The weathered granite soils were obtained at Palgong mountain in Daegu. The existing test results have been carried out without overburden pressures and volume changes. In this study, the volumetric pressure plate extractor is improved to consider two factors such as overburden pressure and volume change. The applied overburden pressures were 0, 25, 50, 75, 100kPa and volume changes were measured at each phase. he results of this study are summarized as follows: As the overburden pressure increases, the volumetric water content decreases at the same matric suction and the air entry value increases and gradient of curve at the transition zone and the size of the hysteresis loops decreases. As the overburden pressure increases, the degree of saturation increases at the same matric suction and degree of saturation of the wetting curve is higher than that of dry curve. The SWCC with volume changes are slightly larger than those without volume changes. The general equation proposed by Fredlund & Xing(1994) to fit the experimental result of the SWCC indicates good agreement. The empirical parameters a, n, m as overburden pressure show similar inclination as the existing results.
Keywords
Soil-water characteristic curve; Unsaturated weathered granite soil; Overburden pressure; Volume change;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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