电势梯度对电化学加固软土影响的试验研究

Experimental study on the effect of pententialgradient on electrochemical reinforcement of soft soil

为研究电势梯度的变化对软黏土电化学加固的影响,开展了相关室内试验。试验采用自制电渗模型箱,共设置4组试样,注入CaCl_(2)溶液,通过控制土体中的电势梯度为0.5 V/cm, 0.75 V/cm, 1 V/cm, 1.5 V/cm,对比分析排水、电流以及试验后土体的含水率与抗剪强度分布等参数。实验结果表明:提高电势梯度能有效改善土体的排水效果与加固效果,相比0.5 V/cm,提高电势梯度后排水量提升了13%~40%,抗剪强度提升了19.4%~52.8%,阳极附近区域与土体中部的强度提升较明显,但电势梯度由1 V/cm提升至1.5 V/cm对加固效果提升较小。

In order to study the effect of potential gradient on electrochemical reinforcement of soft clay,relevant laboratory tests were carried out.The self-made electroosmosis model box is used in the test.Four groups of samples are set.The injected solution is CaCl_(2) solution.By controlling the potential gradient in the soil to 0.5 V/cm,0.75 V/cm,1 V/cm and 1.5 V/cm,the drainage,current,moisture content and shear strength distribution of the soil after the test are compared and analyzed.The experimental results show that increasing the potential gradient can effectively improve the drainage effect and reinforcement effect of soil.Compared with 0.5 V/cm,after increasing the potential gradient,the drainage is increased by 13%~40%and the shear strength is increased by 19.4%~52.8%.The strength of the area near the anode and the middle of the soil is improved obviously,but the improvement of the potential gradient from 1 V/cm to 1.5 V/cm has little effect on the reinforcement effect.