化学电渗法加固软黏土地基对比室内试验研究

doi:10.11779/CJGE201807011

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摘要基于室内试验方法,开展了阳离子摩尔量、CaCl₂和Na₂SiO₃化学作用等因素对软黏土电渗排水及加固效果的影响规律研究;实测了化学溶液联合电渗试验中排水量与排水速率、土体导电性、能耗以及试验结束后土样含水率、抗剪强度的分布规律,并开展了常规电渗试验作为对比分析。研究结果表明,增加土样中阳离子摩尔量,是增加电渗排水量、提高排水速率及缩短电渗时长的有效方法之一;与常规电渗试验相比,联合注入CaCl₂和Na₂SiO₃溶液的土体平均抗剪强度提高了约120%,较单独加入Na₂SiO₃或CaCl₂溶液多提高约20%;联合注入CaCl₂和Na₂SiO₃溶液对改善电渗处理后土体含水率和抗剪强度分布不均问题作用明显。

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	任连伟
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	孔纲强
	张敏霞

关键词 ：地基处理, 软黏土, 化学电渗法, 室内试验

Abstract：Based on the laboratory test method, the improvement effects of soft ground influenced by molar amount of cation, chemical action of CaCl₂and Na₂SiO₃ are investigated. The distributions of drainage rate, soil conductivity, energy consumption, soil water content and shear strength after different tests are analyzed comparatively. For comparative analysis, the laboratory tests on soft ground improvement by the traditional electro-osmotic method are also carried out. The test results show that the increasing molar amount of cations in soft clay is one of the most effective methods to increase the drainage amount, to improve the drainage rate and to shorten the electro-osmotic duration. The average shear strength of soil treated by the combined injection of CaCl₂ and Na₂SiO₃ is increased by about 120%, and nearly 20% higher than that of injection of CaCl₂ or Na₂SiO₃ lonely. The combined method of CaCl₂ and Na₂SiO₃ has significant effect on improving the uniform distribution of water content and shear strength of soft clay after chemical electroosmotic treatment.

Key words： ground improvement soft clay chemical electro-osmosis method laboratory test

收稿日期: 2017-01-20

ZTFLH:

TU472

基金资助:国家自然科学基金项目（51478165,51508166）

作者简介: 任连伟（1980- ）,男,河南周口人,博士,副教授,主要从事地基处理新技术与新桩型研发方面的教学与科研工作。E-mail: renhpu@163.com。

引用本文:

任连伟, 肖扬, 孔纲强, 张敏霞. 化学电渗法加固软黏土地基对比室内试验研究[J]. 岩土工程学报, 2018, 40(7): 1247-1256. REN Lian-wei, XIAO Yang, KONG Gang-qiang, ZHANG Min-xia. Laboratory tests on soft ground improvement by chemical electro-osmosis method. Chinese J. Geot. Eng., 2018, 40(7): 1247-1256.

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[1] ESRIG M I.Pore pressures, consolidation, and electrokinetics[J]. Journal of the Soil Mechanics & Foundations Division, 1968, 94(4): 899-922.
[2] SHANG J Q.Electroosmosis-enhanced preloading consolidation via vertical drains[J]. Canadian Geotechnical Journal, 2011, 35(3): 491-499.
[3] 庄艳峰, 王钊. 电渗的电荷累积理论[J]. 岩土力学, 2005, 26(4): 629-632.
(ZHUANG Yan-feng, WANG Zhao.Electric charge accumulation theory for electro-osmotic consolidation[J]. Rock and Soil Mechanics, 2005, 26(4): 629-632. (in Chinese))
[4] CHIEN S C, OU C Y.A novel technique of harmonic waves applied electro-osmotic chemical treatment for soil improvement[J]. Applied Clay Science, 2011, 52(3): 235-244.
[5] 刘飞禹, 王军, 符洪涛, 等. 逐级加载电压对电渗加固吹填土的影响[J]. 岩石力学与工程学报, 2014, 33(12): 2582-2591.
(LIU Fei-yu, WANG Jun, FU Hong-tao.Influence of applying stepped voltage in electroosmotic reinforcement of dredger fill[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(12): 2582-2591. (in Chinese))
[6] 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.Experimental research on effect of applied voltage on one-dimensional electroosmotic drainage[J]. Rock and Soil Mechanics, 2011, 32(3): 709-714. (in Chinese))
[7] LO K Y, INCULET I I, HO K S.Electroosmotic strengthening of soft sensitive clays[J]. Canadian Geotechnical Journal, 1991, 28(1): 62-73.
[8] 李一雯, 周建, 龚晓南, 等. 电极布置形式对电渗效果影响的试验研究[J]. 岩土力学, 2013, 34(7): 1972-1978.
(LI Yi-wen, ZHOU Jian, GONG Xiao-nan.Experimental research on influence of electrode array on electroosmotic effect[J]. Rock and Soil Mechanics, 2013, 34(7): 1972-1978. (in Chinese))
[9] JONES C J F P, LAMONT-BLACK J, GLENDINNING S, et al. Treatment of lagooned sewage sludge in situ using electrokinetic geosynthetics[J]. Geosynthetics International, 2008, 15(3): 192-204.
[10] GLENDINNING S, LAMONT-BLACK J, JONES C J.Treatment of sewage sludge using electrokinetic geosynthetics[J]. Journal of Hazardous Materials, 2007, 139(3): 491-499.
[11] FENG Y, ZHAN T L T, CHEN Y M, et al. Laboratroy study on electrokinetic dewatering of sewage sludge[M]. Berlin: Springer, 2010.
[12] 陶燕丽, 周建, 龚晓南, 等. 铁和铜电极对电渗效果影响的对比试验研究[J]. 岩土工程学报, 2013, 35(2): 388-394.
(TAO Yan-li, ZHOU Jian, GONG Xiao-nan.Comparative experiment on influence of ferrum and cuprum electrodes on electroosmotic effects[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 35(2): 388-394. (in Chinese))
[13] 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 Yu-chen, 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. (in Chinese))
[14] 邹维列, 杨金鑫, 王钊. 电动土工合成材料用于固结和加筋设计[J]. 岩土工程学报, 2002, 24(3): 319-322.
(ZOU Wei-lie, YANG Jin-xin, WANG Zhao.Design methods of electro-kinetic geosynthetics for consolidation and soil reinforcement[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(3): 319-322. (in Chinese))
[15] 孙召花, 余湘娟, 高明军, 等. 真空-电渗联合加固技术的固结试验研究[J]. 岩土工程学报, 2017, 39(2): 250-258.
(SUN Zhao-hua, YU Xiang-juan, GAO Ming-jun.Experimental studies on vacuum preloading incorporated with electro-osmosis consolidation for dredger fill[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(2): 250-258. (in Chinese))
[16] 王柳江, 刘斯宏, 王子健, 等. 堆载-电渗联合作用下的一维非线性大变形固结理论[J]. 工程力学, 2013, 30(12): 91-98.
(WANG Liu-jiang, LIU Si-hong, WANG Zi-jian.A consolidation theory for one-dimensional large deformation problems under combined action of load and electroosmosis[J]. Engineering mechanics, 2013, 30(12): 91-98. (in Chinese))
[17] 符洪涛, 王军, 蔡袁强, 等. 低能量强夯-电渗法联合加固软黏土地基试验研究[J]. 岩石力学与工程学报, 2015, 34(3): 612-620.
(FU Hong-tao, WANG Jun, CAI Yuan-qiang, et al.Experimental study of combined application of electro-osmosis and low-energy dynamic compaction in soft ground reinforcement[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(3): 612-620. (in Chinese))
[18] 李瑛, 龚晓南. 含盐量对软黏土电渗排水影响的试验研究[J]. 岩土工程学报, 2011, 33(8): 1254-1259.
(LI Ying, GONG Xiao-nan.Experimental study on effect of soil salinity on electro-osmotic dewatering in soft clay[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1254-1259. (in Chinese))
[19] CHIEN S C, OU C Y, WANG M K.Injection of saline solutions to improve the electro-osmotic pressure and consolidation of foundation soil[J]. Applied Clay Science, 2009, 44: 218-224.
[20] CHIEN S C, OU C Y, LEE Y C.A novel electroosmotic chemical treatment technique for soil improvement[J]. Applied Clay Science, 2010, 50(4): 481-492.
[21] BURNOTTE F, LEFEBVRE G, GRONDIN G.A case record of electroosmotic consolidation of soft clay with improved soil-electrode contact[J]. Canadian Geotechnical Journal, 2004, 41(6): 1038-1053.
[22] ASAVADORNDEJA P, GLAWE U.Electrokinetic strengthening of soft clay using the anode depolarization method[J]. Bulletin of Engineering Geology and the Environment, 2005, 64(3): 237-245.
[23] SHANG J Q, MOHAMEDELHASSAN E, ISMAIL M.Electrochemical cementation of offshore calcareous soil[J]. Canadian Geotechnical Journal, 2011, 41(5): 877-893.
[24] OU C Y, SHAOCHI C, WANG Y G.On the enhancement of electroosmotic soil improvement by the injection of saline solutions[J]. Applied Clay Science, 2009, 44(1/2): 130-136.
[25] 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): 453-465.
[26] REDDY K R, URBANEK A, KHODADOUST A P.Electroosmotic dewatering of dredged sediments: Bench-scale investigation[J]. Journal of Environmental Management, 2006, 78(2): 200.
[27] CHIEN S C, OU C Y, WANG Y H.Soil improvement using electroosmosis with the injection of chemical solutions: laboratory tests[J]. Journal of the Chinese Institute of Engineers, 2011, 34(7): 863-875.