关键词: 电渗, 电压, 接触电阻, 电渗排水速率, 能耗

Abstract:

A laboratory test program was conducted in a self-made test tank to investigate one-dimensional electroosmotic drainage at different supply voltages. By monitoring drainage, voltage profile, water content and current intensity every one hour during the entire test period, results below were acquired: higher voltage would lead larger energy consumption per unit volume drainage; the combination of higher voltage and shorter electroosmosis time would cause the abnormal moisture distribution that the highest was in the middle of electrodes and the lowest was near anode; the gradually decreasing of drainage was because of the increasing electrode contact resistances and the decreasing electroosmotic permeability coefficient; the contact resistance existing on the interface of soil and electrode made the voltage used for electroosmotic drainage lower than the supply voltage; and the higher voltage lead the larger anode contact resistance, but the condition in cathode was different that slow increasing occurred at higher voltage and fast increasing at lower. They related to electroosmotic drainage rate which determined mainly by supply voltage.

Key words: electroosmosis, voltage, contact resistance, electroosmotic drainage-rate, energy consumption