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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第3期    总第283期    2018年3月

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文章编号:1672-7207(2018)03-0655-08
电渗固结中接触电阻影响因素的试验研究
谢新宇1, 2,李卓明1, 2,郑凌逶1, 2,李金柱2,刘亦民1, 2

(1. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州,310058; 2. 浙江大学宁波理工学院 土木建筑工程学院,浙江 宁波,315100)

摘 要: 为研究电渗固结过程中接触电阻的影响因素,使用铝电极在等电势情况下对滩涂淤泥开展电渗模型试验。分别采用不同预腐蚀处理的阳极和不同导电面积比的阳极进行电渗试验,并测量排水速率、电流、电势和试验前后的含水率。研究结果表明:腐蚀对电极–土的接触电阻影响不大,不同的腐蚀程度在电渗前期乃至整个电渗过程的排水效果未出现明显差异;增加导电面积比即阳极导电面积与被处理土体横截面积的比值可以减小接触电阻、提高电流,并且阳极导电面积比的最优值为0.47。建议工程应用中适当增加阳极导电面积比以提高电渗效率,可通过接触电阻试验确定最优值。

 

关键词: 电渗固结;接触电阻;电极腐蚀;导电面积比;影响因素

Experimental study on influencing factors of contact resistance on electroosmotic consolidation
XIE Xinyu1, 2, LI Zhuoming1, 2, ZHENG Lingwei1, 2, LI Jinzhu2, LIU Yimin1, 2

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. College of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China

Abstract:A series of electroosmosis tests were conducted with aluminum electrodes and beach silt to study the influencing factors for contact resistance during electroosmotic consolidation on the condition of same potential. Anodes with different degree of corrosions and different conductive areas were used in the tests. Rates of drainage, current, potential and water content before and after the tests were measured. The results show that the electrodes corrosion has little effect on contact resistance between electrodes and silt, and there is no obvious difference of drainage for anodes with different degree of corrosions early or during the whole process. Increasing the ratio of the conductive area of anodes and the cross–sectional area of the soil can reduce the contact resistance and improve the conductivity. An optimum ratio of conductive area exists, which is 0.47. It is recommended that the ratio of conductive area should be increased appropriately in engineering applications to improve the efficiency of electroosmosis and its optimum value can be obtained by contact resistance trial tests.

 

Key words: electroosmosis consolidation; contact resistance; electrode corrosion; ratio of conductive area; influencing factors

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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