土木建筑工程

使用氯化钙溶液加固淤泥质黏土的电渗试验研究

展开
  • 华南理工大学 土木与交通学院∥亚热带建筑科学国家重点实验室∥华南岩土工程研究院,广东 广州 510640
张恒( 1989-) ,男,博士生,主要从事软土加固技术研究

收稿日期: 2018-06-15

  修回日期: 2018-11-26

  网络出版日期: 2019-01-31

基金资助

国家自然科学基金资助项目( 41230630,41730640)

Experimental Research on the Effect of Using Calcium Chloride and Electroosmosis to Reinforce Silt Clay

Expand
  •  School of Civil Engineering and Transportation∥State Key Laboratory of Subtropical Building Science∥South China Institute of Geotechnical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
张恒( 1989-) ,男,博士生,主要从事软土加固技术研究

Received date: 2018-06-15

  Revised date: 2018-11-26

  Online published: 2019-01-31

Supported by

 Supported by the National Natural Science Foundation of China ( 41230630,41730640)

摘要

采用自制电渗试验装置,针对武汉市淤泥质黏土进行电渗试验,探讨阳极处添加 质量分数分别为 0、5% 、10% 、15% 氯化钙溶液对电渗加固效果的影响. 通过监测电渗过 程中各试验组电流和排水量随时间的变化,测定电渗前后土体的含水率、抗剪强度、孔隙 比和微观结构变化,综合评价不同条件下土体的电渗固结效果. 试验结果表明: 在阳极添 加氯化钙溶液可以缩短电渗固结时间,显著提高电渗法加固淤泥质黏土的效果,使土体微 观结构变得更加致密,增强土体的抗剪强度; 通过添加氯化钙溶液,阴极附近土体抗剪强 度最大提高 368. 6% ; 氯化钙溶液浓度对电渗加固效果影响存在一个限值,本次试验为 10% 左右,超出该限值后,浓度的影响很小; 氯化钙溶液的加入会加重电极腐蚀.

本文引用格式

张恒 马勤国 胡赫 牛富俊 . 使用氯化钙溶液加固淤泥质黏土的电渗试验研究[J]. 华南理工大学学报(自然科学版), 2019 , 47(3) : 119 -125 . DOI: 10.12141/j.issn.1000-565X.180300

Abstract

A series of laboratory experiments were performed in a customized apparatus to investigate the effect of using electroosmosis and calcium chloride with percentages of 0,5% ,10% and 15% on reinforcing Wuhan silt clay. During the process of electrochemical treatment,the temporal evolution of electric current and drainage were monitored periodically. Also,the differences in moisture content,soil shear strength and microstructure before and after treatment were studied to assess the synchronous effect of electroosmosis and calcium chloride solution. The following conclusions can be drawn: injecting calcium chloride solution into anodic reservoir can significantly improve the efficiency of electroosmosis by shorting consolidation time and compacting soil microstructure,thus strengthening the properties of silt clay. Further,with injecting calcium chloride solution,the shear strength of cathodic soil increased by approximately 368. 6% . However,there is a threshold value exists in the reinforcement effect,and the positive influence on reinforcing silt clay was negligible once the concentration of calcium chloride exceed 10% . Adding calcium chloride solution would induce severe electrode corrosion,simultaneously.

参考文献

 
文章导航

/