| Civil and Traffic Engineering |
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| Electro-osmosis reinforcement experiment of life source polluted soil |
| ZANG Jun chao, ZHENG Ling wei, XIE Xin yu, CAO Li wen, LI Zhuo ming |
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;
3. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221116, China |
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Abstract A series of laboratory tests were conducted in a Miller Soil Box to investigate the electro-osmosis reinforcement properties of life source contaminated soil. The percentage reduction of water content, energy consumption of unit drainage, shear strength and soil settlement as four influencing factors were analyzed. The rank of the primary factors affecting the electro-osmosis treatment is determined as follows: voltage, energizing time, initial moisture content, additive amount of calcium chloride and electrode material. The experimental results show that the range of voltage ranks first which has main influence on the electro-osmosis reinforcement effect. Considering the cost and efficiency of electro-osmosis, the energizing time should not be too long otherwise the energy consumption coefficient will increase sharply. The more the additive amount of calcium chloride, the higher the initial current. However, too much calcium chloride may reduce the drainage effect. For iron and copper electrodes, efficient drainage results were achieved; for aluminum, it has the lowest energy consumption; for graphite, it has the worst electro-osmosis reinforcement effect. Therefore, iron electrodes are recommended for practical engineering. Finally, a validation test was performed to verify the optimal combination of electro-osmosis, which was also compared with the ordinary soil reinforcement effect.
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Published: 06 March 2017
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Cite this article:
ZANG Jun chao, ZHENG Ling wei, XIE Xin yu, CAO Li wen, LI Zhuo ming. Electro-osmosis reinforcement experiment of life source polluted soil. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(2): 245-254.
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生活源污染土电渗加固试验
为了研究生活源污染土的电渗加固特性,在改进的Miller Soil Box中进行生活源污染土电渗排水试验.分析含水量降低百分比、单位排水量能耗、抗剪强度、土体沉降4个参数,得出影响生活源污染土电渗排水加固效果的主次因素顺序：电源电压>通电时间>初始含水量>CaCl2添加量>电极材料.结果表明：电源电压极差最大,对生活源污染土电渗加固处理效果起到主要作用；考虑经济成本和电渗效率,通电时间不宜过长,否则能耗系数会急剧增大；CaCl2添加量越高则初始电流越大,但CaCl2含量过高反而会导致排水量减少；铁和铜电极排水效果最好,铝电极的能耗最小,石墨电极的电渗效果最差,建议在实际工作中选用铁电极.最后验证了电渗加固的最优组合及水平,并与普通土的加固效果进行对比分析.
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