| 阳极灌浆溶液对电渗加固软土地基的影响 |
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| 引用本文： | 刘飞禹,李玲玉,王军,符洪涛,蔡袁强.阳极灌浆溶液对电渗加固软土地基的影响[J].中国公路学报,2019,32(3):44-52. |
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| 作者姓名： | 刘飞禹 李玲玉 王军 符洪涛 蔡袁强 |
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| 作者单位： | 1. 上海大学 土木工程系, 上海 200444;
2. 温州大学 建筑与土木工程学院, 浙江 温州 325035;
3. 温州大学 浙江省软弱土地基与海涂围垦工程技术重点实验室, 浙江 温州 325035;
4. 温州大学 浙江省海涂围垦及其生态保护协同创新中心, 浙江 温州 325035;
5. 浙江大学 软弱土与环境工程重点实验室, 浙江 杭州 310027 |
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| 基金项目： | 国际科技合作专项项目（2015DFA71550）；国家自然科学基金项目（51878402，51678352，51622810）；浙江省自然科学基金杰出青年项目（LR18E080001）；浙江省重点研发计划项目（2018C03038）；浙江省自然科学基金一般项目（LY17E080010） |
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| 摘 要： | 为改善土体电渗处理效果,研究了电渗期间在阳极处添加化学试剂对地基加固处理的影响。试验采用自制模型箱,共设置5组试样,电势梯度为0.5 V·cm-1。通过电渗过程中在土体与阳极电极板脱离处灌入等量氢氧化钠、氯化钠、氢氧化钙和氯化钙溶液,进行室内试验研究。试验控制添加的阴离子数量相同,钠溶液浓度为2.0 mol·L-1,钙溶液浓度为1.0 mol·L-1。当电渗进行到15 h时,各试验组试样添加50 mL相应溶液。比较分析排水、电流、能耗及处理后抗剪强度、含水率、电导率等参数。试验结果表明:添加化学试剂能明显改善排水效果和土体强度,相比对照组,灌浆处理后抗剪强度提升了27.3%～44.6%,平均含水率降低了10.5%～34.7%;羟基与土体成分反应生成的物质填充孔隙,增大土体密实度和强度,同时会堵塞排水路径等;氯盐综合处理效果较好,但电极腐蚀和平均能耗较大;钙离子较钠离子能更好地改善排水和导电效果;在4种化学试剂中,氯化钙处理效果最佳。
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| 关 键 词： | 道路工程 电渗 地基处理 阳极灌浆 电化学反应 碱溶液 |
| 收稿时间： | 2018-03-11 |
Effects of Anodic Grouting with Different Solutions During Electro-osmosis on a Soft Foundation Treatment |
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| LIU Fei-yu,LI Ling-yu,WANG Jun,FU Hong-tao,CAI Yuan-qiang.Effects of Anodic Grouting with Different Solutions During Electro-osmosis on a Soft Foundation Treatment[J].China Journal of Highway and Transport,2019,32(3):44-52. |
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| Authors: | LIU Fei-yu LI Ling-yu WANG Jun FU Hong-tao CAI Yuan-qiang |
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| Affiliation: | (Department of Civil Engineering,Shanghai University,Shanghai 200444 ,China;School of Architecture and Civil Engineering,Wenzhou University,Wenzhou 325035 ,Zhejiang,China;Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation,Wenzhou University,Wenzhou 325035,Zhejiang,China;Innovation Center of Tideland Reclamation and Ecological Protection,Wenzhou University,Wenzhou 325035,Zhejiang,China;Key Laboratory of Soft Soil and Environmental Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China) |
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| Abstract: | To improve the effectiveness of electro-osmosis treatment of soil, the effects of adding chemical solutions during electro-osmosis on the reinforcement of a soil foundation were investigated. Self-made model boxes were used under an equal electric potential gradient of 0.5 V·cm-1 to conduct an experimental investigation of anode grouting with different solutions. The solutions tested included sodium hydroxide, sodium chloride, calcium hydroxide, and calcium chloride, and were applied as grouting when the soil was separated from the anode plate. The number of anions added to each sample was equal. The concentration of the sodium solutions was 2.0 mol·L-1, and that of the calcium solutions was 1.0 mol·L-1. Each test sample was grouted with 50 mL of solution after 15 h. Parameters such as the electric current, drainage rate, and coefficient of energy consumption during the electro-osmosis process, as well as the moisture content, electrical conductivity, and shear strength after the tests were analyzed. The results show that adding a chemical solution can clearly improve the drainage and strength. Compared with the control group, the average moisture content decreases by more than 10.5% to 34.7%, while the shear strength increases by 27.3% to 44.6%. The substance produced by the reaction of hydroxyl groups with the soil-filled pores increases the compactness and strength but blocks drainage paths. The effects of treatment with the chloride solution are superior; however, the electrode corrosion and average energy consumption are greater than that of the alkali solution. Calcium ions are better than sodium ions for improving drainage and electrical conductivity. The treatment with calcium chloride is the most effective among the four types of chemical solutions tested. |
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| Keywords: | road engineering electro-osmosis ground treatment anodic grouting electrochemistry alkaline solution |
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