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HYSTERESIS OF FLUX‐GRADIENT RELATIONS FOR SATURATED FLOW OF WATER THROUGH CLAY MATERIALS
Author(s) -
NOVÁK V.
Publication year - 1972
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1972.tb01657.x
Subject(s) - hydraulic conductivity , hysteresis , constant (computer programming) , kaolinite , materials science , bentonite , flux (metallurgy) , porosity , flow (mathematics) , thermodynamics , darcy's law , mechanics , geotechnical engineering , mineralogy , porous medium , geology , condensed matter physics , composite material , physics , soil science , metallurgy , computer science , soil water , programming language
Summary The relation between flow velocity ( v ) and hydraulic gradient (7) was studied for two porous materials. The volume of the sample was allowed to change during experiment. For the kaolinite, the relation between v and I is non‐linear, the hydraulic conductivity k becomes dependent on time and varies for both increasing and decreasing 7. After some time, k tends to some constant value. For bentonite, k remains constant as 7 increases. However, when I starts to decrease, k decreases accordingly. Hysteresis in the relationship between v and 7 remains unchanged with time. The observed deviations from Darcy's law may be due to deformation of the voids.