间歇通电联合电极移动作用下电渗法加固滩涂淤泥试验研究

Experimental study on the consolidation of tideland sludge by electro-osmotic method under the effects of intermittent current combined with removing electrode

基于海涂围垦形势的驱动下,针对电渗法处理滩涂淤泥地基存在沉降不均等缺陷,提出了间歇通电联合阳极移动法.为验证该法的有效性,利用自制模型开展了间歇通电联合阳极移动条件下电渗法加固滩涂淤泥室内试验研究.试验分为两个阶段,第一阶段固定通电时间,研究不同通断时间比对电渗试验的影响,同时与连续通电对比,确定最佳通断时间比;第二阶段,在最佳通断时间比下,将电极间距减半以研究靠近阴极土体的加固效果.通过研究发现:间歇通电处理后的加固效果与通断时间比密切相关;间歇通电联合电极移动可以减小两极土体沉降和抗剪强度的差异性.通过上述结论,以期对沿海地区滩涂淤泥处理提供科学依据.

Based on the situation of land reclamation, the method of intermittent current combined with anode moving is proposed to deal with the defects such as the soil difference of settlement in the consolidation process of tideland sludge by electro-osmotic method. In order to verify the effectiveness of the method, a selfmade model was used to investigate the effects on the intermittent current combined with anodic moving by electro-osmotic method. The tests were divided into two stages. In the first stage, the effect of the different power-off ratio is studied based on the fixed power-on time, and then the optimized power-off ratio is obtained by comparison with the continuous conduction. In the second stage, the electrode spacing is halved at the optimized power-off ratio to study the soil consolidation effect near the cathode. Conclusions can be drawn as follows： The effect of intermittent current is closely related to the power-off ratio; the intermittent current combined with electrode moving can reduce the soil difference of settlement and shear strength between the cathode and anode after electro-osmotic consolidation. Therefore, it can provide scientific basis for the treatment of the tideland sludge in coastal areas.