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http://dx.doi.org/10.7843/kgs.2006.22.7.55

Effect of Hysteresis on Soil-Water Characteristic Curve in Weathered Granite and Gneiss Soil Slopes during Rainfall Infiltration  

Shin, Gil-Ho (Dept. of Civil & Env. Engrg., Dankook Univ.)
Park, Seong-Wan (Dept. of Civil & Env. Engrg., Dankook Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.22, no.7, 2006 , pp. 55-64 More about this Journal
Abstract
Shallow failures of slopes in weathered soils are caused by infiltration caused by prolonged rainfall. These failures are mainly triggered by the deepening of the wetting band accompanied by a decrease in suction induced by the water infiltration. In this paper, hysteresis on soil-water characteristic curve (SWCC) of granite and gneiss weathered soils is investigated using transient flow analysis respectively. Each case was subjected to artificial rainfall intensities and time duration depending on the laboratory-based drying and wetting processes. The results show that the unsaturated seepage on weathered slopes are very much affected by the initial suction of soils and unsaturated permeability of the soils. In addition, a granite weathered soil has a lower air-entry value, residual matric suction, and wetting front suction and less hysteresis loop than a gneiss weathered soil.
Keywords
Hysteresis; Rainfall infiltration; Soil-water characteristic curve; Weathered soils;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Kim, S., Hong, W. and Kim, Y. (1992), 'Prediction of Rainfalltriggered Landslides in Korea', Proc. of 6th Int. Symp. on Landslides, Christchurch, New Zealand, Vol.2, pp.989-999
2 Fredlund, D. and Xing, A. (1994), 'Equations for the Soil-Water Characteristic Curve', Canadian Geotechnical Journal, Vol.31, No.4, pp.521-532   DOI   ScienceOn
3 Fredlund, D. (2005), 'Unsaturated Soil Mechanics in Engineering Practice', Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vo1.132, No.3, pp.286-321   DOI   ScienceOn
4 GEO-SLOPE International Ltd (2005), 'Computer program SEEP/W for finite element seepage analysis', User's guide
5 Cho, W. (2001), 'In-situ Monitoring of Matric Suctions in a Weathered Granite Soil Slope', Master's Thesis, Korea University, Seoul, Korea
6 김재홍, 박성완, 정상섬, 유지형 (2002), '강우시 습윤에 의한 불포화 풍화토의 사면안정 해석 연구', 한국지반공학회 논문집, 제18권 2호 pp.128-136
7 Fredlund, D., Xing, A. and Huang, S. (1994), 'Predicting the Permeability Function for Unsaturated Soils Using the Soil-water Characteristic Curve', Canadian Geotechnical Journal, Vol.31, pp.533-546   DOI   ScienceOn
8 이인모, 조우성, 김영욱, 성상규 (2003), '풍화토 사면에서 강우로 인한 간극수압 변화에 대한 실험연구', 한국지반공학회 논문집, 제19권, pp.41-49