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Characterization on the Relationships among Rainfall Intensity, Slope Angle and Pore Water Pressure by a Flume Test : in Case of Gneissic Weathered Soil  

Chae, Byung-Gon (Geological & Environmental Hazards Div., Korea Institute of Geoscience and Mineral Resources)
Lee, Seong-Ho (Dept. of Earth and Environmental Sci. & Inst. for Basic Science Res., Chungbuk National University)
Song, Young-Suk (Geological & Environmental Hazards Div., Korea Institute of Geoscience and Mineral Resources)
Cho, Yong-Chan (Geological & Environmental Hazards Div., Korea Institute of Geoscience and Mineral Resources)
Seo, Yong-Seok (Dept. of Earth and Environmental Sci. & Inst. for Basic Science Res., Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.17, no.1, 2007 , pp. 57-64 More about this Journal
Abstract
This study was conducted to characterize on the relationships among rainfall intensity, slope angle and pore water pressure in the gneissic weathered soil by landslide laboratory flume tests. Under the several test conditions dependent on rainfall intensity and slope angle, the authors measured pore water pressure, failure and displacement of slope on a regular time interval. According to the test results, the increasing times of pore water pressures have direct proportional trends to the rainfall intensity. The pore water pressure was increased earlier at the head part of slope than the toe part. Compared with the test results of Chae et al(2006), the results of this study explain that the seepage velocity in the gneissic weathered soil is slower than that in the standard sands. It results in faster and ear-lier increase of pore water pressure at the head part of slope due to slow flow of water in the gneissic weathered soil. In case of the relationship between slope angle and pore water pressure, gentle slope angle has faster increase of pore water pressure than steeper slope angle. It is also thought to be due to slow seepage velocity and flow velocity in the gneissic weathered soil.
Keywords
gneissic weathered soil; landslide laboratory flume tests; rainfall intensity; slope angle; pore water pressure;
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Times Cited By KSCI : 2  (Citation Analysis)
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