J. Yin et al., COEFFICIENT OF PERMEABILITY FROM AC ELECTROOSMOSIS EXPERIMENTS .1. THEORY, Journal of geotechnical engineering, 122(5), 1996, pp. 346-354
Electroosmosis techniques have been used in geotechnical and geoenviro
nmental engineering applications. However, due to electrochemical chan
ges and gas generation at the electrodes as a result of prolonged appl
ication of a direct current electric field, its application in determi
ning soil properties has been limited. A methodology, which uses a wea
k alternating current (AC) as the driving force is developed to minimi
ze these adverse effects. The governing partial differential equation
for one-dimensional AC electroosmosis is presented for an experimental
situation in a companion paper. Three boundary conditions, which refl
ect the possible range for a closed boundary are identified. Transient
and steady-state solutions are given for the ideal undrained boundary
conditions. Analytical steady-state solutions are given for the two n
ominally undrained boundary conditions. These solutions indicate that
both small deformations of the boundary cavity and impedance effects d
ue to relatively low permeability of an equivalent porus stone play an
important role in the pore-pressure responses. Procedures based on th
e steady-state solutions for backcalculating the coefficient of permea
bility are presented.