電滲法中電極布置形式的對比試驗研究*
陶燕麗1,2, 周 建2, 李一雯1,2
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(1 天津市軟土特性與工程環(huán)境重點實驗室，天津 300384; 2 浙江大學(xué)濱海和城市巖土工程研究中心，杭州 310058)[摘要] 為研究電極布置形式對電滲排水效果的影響，采用不銹鋼管電極外加12V電壓，通電96h，在自制的模型箱內(nèi)先后進行了長方形、梅花形和平行錯位3種電極布置形式的模型試驗。從含水量、抗剪強度、電滲排水量、電流降低率和裂縫開展幾方面進行比較分析，發(fā)現(xiàn)：有效電場面積最小的平行錯位布置排水效果反而最好，有效電場面積最大的梅花形布置排水效果最差，電滲的排水量并不僅受有效電場面積影響；試驗過程中由于陰極排水不暢引起表面積水，導(dǎo)致電流值在通電初期不降反升；裂縫與電滲效果的關(guān)系密切，因其開展的位置及深度不同，可以是有利的排水通道也可以阻隔陰陽極通路影響電滲效率?？偨Y(jié)室內(nèi)試驗的結(jié)果，建議優(yōu)先采用電極的平行錯位布置形式進行電滲處理。[關(guān)鍵詞] 電滲；電極布置；有效電場；排水量；裂縫中圖分類號：TU443 文獻標識碼：A 文章編號：1002-848X(2013)S2-0214-05*天津市軟土特性與工程環(huán)境重點實驗室開放基金（2011SCEEKL004）。作者簡介：陶燕麗，博士研究生，Email：550691114@qq.com。Electro-osmotic experimental research on three arrangements of electrodesTao Yanli1,2, Zhou Jian2, Li Yiwen1,2(1 Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China; 2 Research Center of Coastal and urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China)Abstract: Aiming at researching the effect of electrodes array to electro-osmotic dewatering, electro-osmotic laboratory model tests with three different arrangements of electrodes, namely rectangular array, hexagonal array and parallel and transposition array, were carrying out in a self-made model casing. Stainless steel tube electrodes were adopted, applied 12 voltages and the treated time was 96 hours among the three electrode arrangements. Water content, shear strength, drainage, the rate of current decrease and cracks on the soil were analyzed and compared after the tests. The results demonstrate that parallel and transposition array has the largest electro-osmotic drainage and the smallest area of effective electric field, while hexagonal array has the largest area of effective electric field but the drainage effect of it is the worst. Because of the stagnant water on the surface, current rose instead of decreasing at the beginning. The cracks closely relate to the electro-osmotic efficiency. it may work as favorable drainage channel, and also can cut off the path between the anode and cathode at different location and developing depth. Based on the results of laboratory tests, it is suggested that parallel and transposition array is the best choice for electro-osmotic treatment.Keywords: electro-osmosis; effective electric field; electrodes array; drainage; cracks on the soil
