间歇通电模式影响电渗效果的试验

Experimental research of the influence of current intermittence on electro-osmotic effect

为了研究间歇通电模式对电渗加固效果的影响,采用实验室一维模型箱,在不同通断模式下开展电渗试验.试验分两个阶段,第一阶段固定通断时间比,研究不同通电周期对电渗的影响,同时与连续通电对比;第二阶段,固定通电周期,研究通断时间比对电渗的影响.测量试验过程中的电流、阴极排水量,试验结束时的抗剪强度以及含水量分布,并给出不同组试验的阳极板腐蚀图.结果表明：间歇通电能否有效以及通电周期和通断比对电渗效果的影响会因试验时间的不同而存在差异;采用适当的通电周期和通断时间比,间歇通电可以减缓电极腐蚀,提高电渗效果.文章最后对已有文献中的分歧作出了解释,并指出电渗法实际工程应用中,建议通电周期选取1~4 h,通断时间比取2.0.

Series of one-dimensional electro-osmotic laboratory tests were conducted in a self-made tank to investigate the impact of current intermittence on electro-osmotic effect. The tests were divided into two stages.In the first stage,time ratio of power on and off was fixed to study the effects of different power on periods,which were also compared with the result of continuous conduction. In the second stage,the power on period was fixed to study how different time ratios of power on and off affect electro-osmotic process. Currents and drainages were monitored every certain time during the test,while the distributions of shear strength,water content were measured after the test. The results suggest that the testing time possesses key influence on the effectiveness of current intermittence and the distinction of electro-osmotic effects obtained. With appropriate power on period and time ratio,current intermittence can result in lighter electrode corrosion and enhance electro-osmosis efficiency excessively. Finally,reasonable explanations of the different results in existing literature were given,and it is recommended to employ current intermittence for engineering application of the electro-osmosis technique,with the optimal power on period and time ratio of power on and off being 1- 4 h and2. 0 respectively.