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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[1] 胡敏云,陈云敏,温振统.城市垃圾填埋场垃圾土压缩变形的研究[J].岩土工程学报,2001,23(1): 123-126.
HU Minyun, CHEN Yunmin, WEN Zhengtong. Study on the compressibility and deformation of MSW in landfill [J]. Chinese Journal of Geotechnical Engineering, 2001,23(1): 123-126.
[2] 骆行文,杨明亮,姚海林,等.陈垃圾土的工程力学特性试验研究[J].岩土工程学报, 2006,28(5): 622-625.
LUO Xing wen, YANG Ming liang, YAO Hai lin, et al. Experimental study on engineering mechanical properities of agedrefuse [J]. Chinese Journal of Geotechnical Engineering, 2006,28(5): 622-625.
[3] 陈云敏,柯瀚.城市生活垃圾的工程特性及填埋场的岩土工程问题[J].工程力学, 2005(S1): 119-126.
CHEN Yunmin, KE Han. Engineering characteristics of municipal solid wastes and geotechnical problems of landfiles[J]. Engineering Mechanics, 2005(S1):119-126.
[4] YEUNG A T, HSU C N, MENON R M. Physicochemical soilcontaminant interactions during electrokinetic extraction [J]. Journal of Hazardous Materials, 1997, 55: 221-237.
[5] KANIRAJ S R, YEE J H S. Electroosmotic consolidation experiments on an organic soil [J]. Geotechnical andGeological Engineering, 2011, 29(4): 505-518.
[6] ESRIG M I. Pore pressure, consolidation and electro kinetics [J]. Journal of the SMFD, American Society of Civil Engineers, 1968, 94(SM4): 899-921.
[7] 陶燕丽,周建,龚晓南.电极材料对电渗过程作用机理的试验研究[J].浙江大学学报:工学版, 2014,48(9):1618-1623.
TAO Yan li, ZHOU Jian, GONG Xiao nan. Experimental study on function mechanism of electrode materials upon electroosmotic process[J]. Journal of Zhejiang University: Engineering Science, 2014,48(9):1618-1623.
[8] 李瑛,龚晓南,张雪婵.电压对一维电渗排水影响的试验研究[J].岩土力学,2011,32(3): 709-714.
LI Ying, GONG Xiao nan, ZHANG Xue chan. Experi-mental research on effect of applied voltage on one-dimensional electroosmotic drainage[J]. Rock and Soil Mechanics, 2011,32(3): 709-714.
[9] 曹丽文,连秀艳,洪雷,等.金属离子污染土土工性质的实验研究[C]∥第三届全国岩土与工程学术大会.成都: 四川科学技术出版社,2009: 556-560.
CAO Li wen, LIAN Xiu yan, HONG Lei et al. Experi-mental study of metalion contaminated soil geotechnical properties [C]∥The Third National Academic Conference of Geotechnical and Engineering. Chengdu: Sichuan Science and Technology Press, 2009: 556-560.
[10] 龚晓南,焦丹.间歇通电下软黏土电渗固结性状试验分析[J].中南大学学报:自然科学版, 2011,42(6):1725-1730.
GONG Xiaonan, JIAO Dan. Experimental study of electro-osmotic consolidation of soft clay under intermittent current condition [J]. Journal of Central SouthUniversity: Science and Technology, 2011,42(6):17251730.
[11] 胡俞晨,王钊,庄艳峰.电动土工合成材料加固软土地基实验研究[J].岩土工程学报,2005,27(5): 582-586.
HU Yuchen, WANG Zhao, ZHUANG Yan feng. Experimental studies on electro-osmotic consolidation of soft clay using EKG electrodes [J]. Chinese Journal of Geotechnical Engineering, 2005, 27(5): 582-586.
[12] 刘飞禹,宓炜,王军.逐级加载电压对电渗加固吹填土的影[J].岩石力学与工程学报,2014, 33(12):2582-2591.
LIU Fei yu, MI Wei, WANG Jun. Influence of applying stepped voltage in electroosmotic reinforcement of dredger fill [J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(12): 2582-2591.
[13] 焦丹,龚晓南,李瑛.电渗法加固软土地基试验研究[J].岩石力学与工程学报,2011,30(S1):3208-3216.
JIAO Dan, GONG Xiao nan, LI Ying. Experimental study of consolidation of soft clay using electro-osmosis method [J]. Chinese Journal of Rock Mechanics and Engineering, 2011,30(S1): 3208-3216.
[14] LEFEBVRE G, BURNOTTE F. Improvements of electrosmotic consolidation of soft clays by minimizing power loss at electrodes [J]. Canadian Geotechnical Journal, 2002, 39(2): 399-408.
[15] ALSHAWABKEH A N, SHEAHAN T C, WU X. Coupling of electrochemical and mechanical processes in soils under DC fields [J]. Mechanics of Materials, 2004, 36(5/6): 453-465.
[16] WANG Jun, MA Jian jun, LIU Fei yu et al. Experimental study on the improvement of marine clay slurry by electroosmosis vacuum preloading[J]. Geotextiles and Geomembranes, 2016,44(4): 615-622.
[17] OTSUKI N, YODSUDJAI W, NISHIDA T. Feasibility study on soil improvement using electrochemical technique [J]. Construction and Building Materials, 2007,21(5): 1046-1051.
[18] FOX P J, LEE J, LENHART J J. Coupled consolidation and contaminant transport in compressible porous media[J]. International Journal of Geomechanics, 2010,11(2): 113-123. |
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