针对电渗加固软土地基能耗高,黏土-电极界面电势损失大的问题,从电化学反应角度出发,研究电极反应对界面电阻的影响。利用自行研制的一维电渗固结装置,开展电极材料和通电模式两大关键因素的室内试验研究,探究黏土-电极界面电阻变化趋势,并利用电化学界面电阻模型阐述其机理。试验结果表明：电极反应改变界面电化学特性,影响界面电阻进而影响电渗排水速率；阳极界面电阻受电极反应影响明显,长期通电情况下EKG电极阳极界面电阻较小,而金属电极则在浓差电阻和表面膜阻的共同影响下阳极界面电阻较大；采用优化通电模式有利于缓解界面极化现象,抑制界面电阻增长。

In order to the issue of high energy consumption and significant potential loss at the soil-electrode interface during electroosmotic consolidation, this study investigates the impact of electrode reactions on interface resistance from an electrochemical perspective. By using a self-designed one-dimensional electro-osmotic consolidation device, indoor experimental studies were conducted to explore the trend of the clay-electrode interface resistance under different electrode materials and different power supply modes, and the mechanism was elucidated using an electrochemical interface resistance model. The experimental results show that electrode reactions alter the interface electrochemical properties, affecting interface resistance and thus the electroosmotic drainage rate. The anode interface resistance is significantly affected by electrode reactions, with a smaller anode interface resistance observed in the EKG electrode under long-term electrification, while the metal electrode exhibits a larger anode interface resistance due to the combined effects of concentration polarization and surface membrane resistance. Using an optimized power supply strategy can help alleviate interface polarization and inhibit interface resistance growth.

TU472.5

国家自然科学基金资助项目（52078455，51708507）；浙江省“领雁”计划项目（2022C01130）