电渗固结中接触电阻影响因素的试验研究

Experimental study on influencing factors of contact resistance on electroosmotic consolidation

为研究电渗固结过程中接触电阻的影响因素,使用铝电极在等电势情况下对滩涂淤泥开展电渗模型试验。分别采用不同预腐蚀处理的阳极和不同导电面积比的阳极进行电渗试验,并测量排水速率、电流、电势和试验前后的含水率。研究结果表明:腐蚀对电极–土的接触电阻影响不大,不同的腐蚀程度在电渗前期乃至整个电渗过程的排水效果未出现明显差异;增加导电面积比即阳极导电面积与被处理土体横截面积的比值可以减小接触电阻、提高电流,并且阳极导电面积比的最优值为0.47。建议工程应用中适当增加阳极导电面积比以提高电渗效率,可通过接触电阻试验确定最优值。

A series of electroosmosis tests were conducted with aluminum electrodes and beach silt to study the influencing factors for contact resistance during electroosmotic consolidation on the condition of same potential.Anodes with different degree of corrosions and different conductive areas were used in the tests.Rates of drainage,current,potential and water content before and after the tests were measured.The results show that the electrodes corrosion has little effect on contact resistance between electrodes and silt,and there is no obvious difference of drainage for anodes with different degree of corrosions early or during the whole process.Increasing the ratio of the conductive area of anodes and the cross–sectional area of the soil can reduce the contact resistance and improve the conductivity.An optimum ratio of conductive area exists,which is 0.47.It is recommended that the ratio of conductive area should be increased appropriately in engineering applications to improve the efficiency of electroosmosis and its optimum value can be obtained by contact resistance trial tests.