通电方式对电渗加固软土影响试验研究

采用微型电渗试验装置,进行持续通电、逐级增加电压、逐级降低电压以及电流衰减增加电压四组室内模型试验,对比研究通电方式对电渗排水加固效果的影响,探索对电渗加固有利的通电方式。记录试验过程中排水量、电流、有效电势、排水速率等指标,检测试验结束后土体抗剪强度、含水率。试验结果表明:电流衰减时增加电压通电方式使电流保持较高水平,能排出较多的水,所得十字板抗剪强度最高,处理效果最好。其次是持续通电方式、逐级增加电压方式,逐级降低电压通电方式处理效果不理想;电势在阳极处损失较大,逐级增加电压以及电流衰减方式在处理的后期能保持较高的有效电势,相比持续通电方式有效电势高出约15%。因此采用电流衰减时增加电压能发挥较好的加固效果。

Experimental study on influence of electrification method on soft soil enhanced by electroosmosis

In this paper，four groups of indoor model tests are carried out by using micro electroosmotic test device，which are continuous power on，increasing voltage step by step，decreasing voltage step by step and increasing voltage by current attenuation． The influence of power on the effect of electroosmotic drainage reinforcement is compared and studied，and the favorable power on electroosmotic reinforcement is explored． The indicators such as displacement，current，effective potential，and drainage rate during the test are recorded，and the shear strength and water content of the soil after the test are completed． The test results show that when the current is attenuated，the voltage is energized to keep the current at a high level，and more water can be discharged． The obtained vane shear strength has the highest shear strength and the best treatment effect． Followed by the continuous energization mode，step-by-step voltage increase method，step-by-step reduction of voltage energization mode processing effect are not ideal． Potential loss at the anode is large，step-by-step increase voltage and current attenuation mode can maintain a high effective potential in the later stage of processing． The effective potential is about 15% higher than the continuous energization mode． Therefore，increasing the voltage with current attenuation can play a better reinforcement effect．