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High Head Permeability of Sand with Dispersed Clay Particles
Author(s) -
Denson Keith H.,
Wu Ping K.
Publication year - 1971
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr007i006p01661
Subject(s) - hydraulic head , permeability (electromagnetism) , hydraulic conductivity , expansive clay , montmorillonite , geotechnical engineering , geology , clay minerals , materials science , mineralogy , composite material , soil science , chemistry , soil water , biochemistry , membrane
High head permeability coefficients of sand‐clay mixtures were obtained for hydraulic gradients that ranged from 5.6 to 408. The sand had a mean diameter of 0.36 mm with a standard deviation of 0.20 mm. The clay constituent was Yazoo formation expansive clay that contained approximately 30% montmorillonite. Clay percentages varied from ½ to 2½%. The addition of 2½% clay at a constant hydraulic gradient of 408 reduced the coefficient of permeability by 56.8%. For the 2½% clay mixture, the coefficient of permeability decreased by 16.6% as the hydraulic gradient increased from 5.6 to 408. The permeability coefficient for pure Columbus sand decreased by 12% as the hydraulic gradient changed from 5.6 to 408.