等电势梯度下电极间距对电渗影响的试验研究  

Experimental research on effect of electrode spacing on electro-osmotic dewatering under same voltage gradient

作　　者：李瑛[1,2] 龚晓南[1] 

机构地区：[1]浙江大学软土与环境工程教育部重点实验室,杭州310058 [2]浙江省建筑设计研究院,杭州310006

出　　处：《岩土力学》2012年第1期89-95,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50879076)

摘　　要：通过室内1:5的模型试验进行了等电势梯度下2 m×1 m和1 m×0.5 m两种工程常见矩形布置电极间距下的软黏土电渗性状的研究。利用监测排水量、排水速率、电流、电势、含水率和pH值等指标,对不同电极间距试样的电渗处理效果、能量效率和电极腐蚀等方面进行了分析。结果表明:保持电势梯度不变而减半电极间距能够加快电渗排水,降低土体含水率,减小能量消耗和电极界面电阻,但也会导致土体pH值变化和阳极腐蚀量的增大。此外,采用较小的电极间距可使损失在电极和土接触面上的电势降减小,但损失的电势降占电源电压的比例增大。A 1：5 scaled model test is conducted in order to find a simple and feasible technical means to improve electro-osmotic efficiency in soft clay foundation. The test program involves two different electrode spacings which are 2m×1m and 1m×0.5m. By monitoring drainage, current intensity, voltage, water＇ content and soil pH values, two tests are compared in terms of treatment effect, energy efficiency and electrodes corrosion. The results show that： halving the electrode spacing and keeping the voltage gradient could improve electro-osmotic treatment efficiency effectively including faster drainage rate, more reduction in water content, less energy consumption and less interface resistivity while it would also lead more changes in pH values of soil and more anodes corrosion; moreover, in the condition of halved spacing, smaller voltage drop took place at the soil-electrode interface; but the proportion of the voltage drop to supply voltage is higher.

关 键 词：电极间距 矩形布置 电势梯度 电渗效率 电极腐蚀 

分 类 号：TU443[建筑科学—岩土工程]