电渗排水固结中电极材料的对比试验  

Comparative experiments of different electrode materials on electro-osmotic consolidation

作　　者：张雷 王宁伟[2] 景立平[3] 方晨[4] 董瑞 ZHANG Lei;WANG Ning-wei;JING Li-ping;FANG Chen;DONG Rui(School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu 212005,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China;Department of Civil Engineering,University of Nebraska-Lincoln,Nebraska,USA)

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212005 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168 [3]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [4]内布拉斯加大学林肯分校土木工程系,美国内布拉斯加

出　　处：《岩土力学》2019年第9期3493-3501,3514,共10页Rock and Soil Mechanics

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目（No.2017B10,No.2017B14）;国家重点研究发展计划重点专项（No.2016YFC0800205）;国家自然科学基金（No.51438004,No.51408566）~~

摘　　要：采用辽宁沿海地区淤泥质软土对铁、铜、铝和新型复合电极等不同电极材料进行室内电渗排水固结试验,从有效电势、电流、排水量与排水速率、能耗、电渗后土体含水率和承载力等对电渗效果进行分析。新型复合电极材料是由碳纤维、塑料排水板与铁片组成,其充分利用各种材料的优点,既解决了铁与碳纤维直接相连通电后易断的问题,又解决了电极腐蚀严重的问题。多组试验结果表明:新型复合电极材料的电渗排水固结使土体的加固强度提升较高,且相对均匀,加固强度达到160 kPa以上的土体面积占加固总面积的75%,说明新型复合电极材料的优越性。金属电极的腐蚀较为严重,且主要发生在阳极。根据电渗后阳极的腐蚀比,新型复合电极的腐蚀量明显低于金属电极,且新型复合电极可提高加固效果,节约电极材料成本。This paper conducted a series of electro-osmotic consolidation experiments on marine clayey soils collected from the coastal region in Liaoning Province. The effect of the electrode materials, such as the steel, copper, aluminum and a new composite electrode, on electro-osmotic consolidation was investigated. The consolidation efficiency was analyzed through the experimental results including the effective potential, current, dewatering amount, velocity of dewatering, energy consumption, water content and bearing capacity of the consolidated soil. The new composite electrode, which consists of the carbon fiber, plastic drainage board and steel plate, takes advantage of each material. Thus, the fracture of the steel is solved after the current flows through the steel, and the electrode erosion is reduced. The experimental results demonstrated that the strength of the consolidated soil increased significantly by using the new composite electrodes, and the soil area with the strength of larger than 160 kPa accounts for 75%. In the experiments, severe erosion of the electrode mainly occurred at the anode. According to the erosion ratio of the anode, the erosion amount of the composite electrode was less than that of the metal electrodes. The new composite electrode improved the consolidation efficiency and reduced the cost of the electrode.

关 键 词：电渗排水固结 电极材料 新型复合电极 排水速率 承载力 对比试验 

分 类 号：TU411[建筑科学—岩土工程]