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http://dx.doi.org/10.7843/kgs.2010.26.10.49

Estimation of Unsaturated Permeability Function from Water Retention Characteristics for Korean Weathered Soils  

Kim, Yun-Ki (Railroad Structure Research Department, KRRI)
Choi, Kyung-Lim (Plant Business Management Team, SK E&C)
Lee, Sung-Jin (Railroad Structure Research Department, KRRI)
Lee, Seung-Rae (Dept. of Civil and Environmental Engrg., KAIST)
Kwon, Hyoung-Seok (Institute of Construction Technology, Samsung E&C)
Publication Information
Journal of the Korean Geotechnical Society / v.26, no.10, 2010 , pp. 49-60 More about this Journal
Abstract
Unsaturated permeability function is an important factor in the design and analysis of various unsaturated soil structures. Generally the permeability characteristics decrease as the mat ric suction increases and the trend is similar to water retention characteristics of a soil. The permeability of unsaturated soils can be obtained directly by laboratory tests or indirectly by estimation methods from other soil properties. For unsaturated soils sampled from 7 areas in KOREA, SWCCs and unsaturated permeability functions were obtained by experimental tests. The unsaturated permeability results were also compared with the unsaturated permeability functions derived from the SWCCs theoretically. However, the current estimation models of unsaturated permeability function did not express the unsaturated permeability characteristics. Therefore, the FXK-M permeability function was modified to predict more accurate permeability functions for Korean weathered soils using a correction factor that can be calculated from the air-entry value of SWCC. The new estimation model resulted in good agreements for all tested soils.
Keywords
Estimation of soil properties; Soil-Water characteristic curve; Unsaturated permeability function; Unsaturated soil; Weathered soil;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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