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A Measurement of Hydraulic Conductivity of Disturbed Sandy Soils by Particle Analysis and Falling Head Method  

Jeong Ji-Gon (Dept. of Geology and Earth Environmental Sciences, Chungnam National University)
Seo Byong-Min (Research Institute of Basic Sciences, Chungnam National University)
Ha Seong-Ho (Seojeong Engineering, Co. Ltd.)
Lee Dong-Won (Seojeong Engineering, Co. Ltd.)
Publication Information
The Journal of Engineering Geology / v.16, no.1, 2006 , pp. 15-21 More about this Journal
Abstract
Sandy soils obtained from the field were examined by the way of particle analyses. The hydraulic conductivity values of the disturbed soil samples were measured by the falling head method. Then the correlations between the hydraulic conductivity and particle distribution were defined. The soil which was a product of the weathering of the granitic rocks belonged to sand and loamy sand area in a sand-silt-clay triangular diagram. The measurements of hydraulic conductivity were $1.15X10^{-5}\sim7.31X10^{-4}cm/sec$ which is the range of sand and silt. It was clearly observed that the hydraulic conductivity measurements of the sandy soils showed stronger correlations with the particle variances rather than the mean grain sizes. The larger the variances, the smaller the hydraulic conductivity measurements. The sandy soil which was a product of weathered granite and whose mean grain size was $0.38\sim1.97mm$ showed regression curves of $y=6.0E-5x^{-1.4}$ in a correlations between hydraulic conductivity and particle variances. Accordingly, it is clearly concluded that making estimates with-out any consideration about particle variances can produce serious errors.
Keywords
falling head method; hydraulic conductivity; sandy soil; particle variance;
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