Numerical Simulation of Pore Water Distribution in Unsaturated Soils under Electric Field

A numerical model for predicting the moisture distribution under an external electric field in unsaturated soils is established. Key parameters, including matric potential, hydraulic and electrical permeability coefficients and electric conductivity, are discussed. The simulation results show agreement with the measured data from the literature, which verifies the exactness and suitability of the model. In general, the moisture contents decrease with time under the action of an external electric force and matrix suction. A slight increase in moisture content was observed in the anodic area at the beginning of the treatment. The electro-osmosis treatment effect can be enhanced by improving the voltage gradient or weakening the voltage loss at the electrode. The limit value of electroosmosis treatment in moisture content is observed, and the method can only be applied to the soil with a moisture content that exceeds the limit value.