In-Situ Volume-Change Properties by Electro-Osmosis - Theory

by Sunirmal Banerjee, (A.M.ASCE), Sr. Geotechnical Engr.; International Engineering Co., Inc., San Francisco, Calif.,
James K. Mitchell, (F.ASCE), Prof. and Chmn. of Civ. Engrg. Dept.; Univ. of California at Berkeley, Berkeley, Calif.,

Serial Information: Journal of the Geotechnical Engineering Division, 1980, Vol. 106, Issue 4, Pg. 347-365

Document Type: Journal Paper


The basic concept involves incorporation of a simple electrode system in a field probe, measurement of pore-water pressure changes at the electrodes as a function of time in response to a DC field, and measurement of the electro-osmotic flow rate of water. Mathematical solutions for pore-water pressure responses for different electrode geometry and drainage conditions at the electrodes are presented in dimensionless form, so that measurement of pore-water pressure responses at the electrodes as a function of time for a relatively short period should enable computation of the coefficient of consolidation, cv and the ratio of the coefficient of electro-osmotic conductivity to hydraulic conductivity, ke/kh. Unique solutions for ke, kh, and the coefficient of volume change, mv, are shown to be possible using measured electro-osmotic flow rate in a closed loop between electrodes and comparison with theory.

Subject Headings: Flow measurement | Pressure measurement | Pore water | Pore pressure | Field tests | Osmosis | Flow rates | Flow duration | District of Columbia | United States

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