低渗透致密黏土电渗排水技术室内试验研究

doi:10.13722/j.cnki.jrme. 2021.0206

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摘要为了解决常规排水固结法对于低渗透致密岩土体加固效果不佳的问题，鉴于电渗排水技术在软土地基加固方面取得的成果，选取某露天煤矿边坡低渗透致密黏土样品，通过实验室对原状土及重塑黏土样品开展电渗排水试验研究。结果表明：电渗排水可以分为初始排水、稳定排水和后期排水3个阶段，实际工程中可以将电流急剧下降作为电渗排水的结束标志，避免后期能耗增大；低渗透致密原状黏土在电渗排水法加固过程中，含水率平均降低13.4%，承载力平均提高了1.34倍，抗剪强度平均提高了1.85倍；此外，相同条件下，板电极布置形式对土体的加固效果更好，但电极平行错位布置形式更适用于实际工程中。

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	李金典1
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	韩猛1
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	封海洋1
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	陈亚飞1
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关键词 ：土力学, 电渗排水, 低渗透致密黏土, 排水特性, 电极布置, 能耗

Abstract：Many achievements of electroosmotic drainage technology have been made in soft soil foundation reinforcement. Low-permeability dense clay was not well reinforced by conventional drainage consolidation method. In order to solve the problem，a low permeability dense clay sample of an open pit coal mine was selected. The electroosmotic drainage test was carried out on undisturbed soil and remolded clay samples in the laboratory. The results show that the electroosmotic drainage was divided into initial drainage stage，stable drainage stage，and later drainage stage. In practical engineering，the sharp decrease of current can be used as the end sign of electroosmotic drainage to avoid increasing energy consumption in the later drainage stage. During the reinforcement of low-permeability dense undisturbed clay by electroosmotic drainage method，the water content decreased by 13.4 % on average, the bearing capacity increased by 1.34 times on average，and the shear strength increased by 1.85 times on average. In addition，under the same conditions，the plate electrode layout has a better reinforcement effect on soil，but the electrode parallel dislocation layout is more suitable for practical engineering.

Key words： soil mechanics electroosmotic drainage low permeability dense clay drainage characteristic electrode arrangement energy consumption

引用本文:

李金典1，2，韩猛1，2，封海洋1，2，陈亚飞1，2. 低渗透致密黏土电渗排水技术室内试验研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3464-3471.
LI Jindian1，2，HAN Meng1，2，FENG Haiyang1，2，CHEN Yafei1，2. Laboratory experimental study on electroosmotic drainage technology of low-permeability dense clay. , 2021, 40(S2): 3464-3471.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme. 2021.0206 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3464

[9]	SHANG J Q，LO K Y. Electrokinetic dewatering of a phosphate clay[J]. Journal of Hazardous Materials，1997，55(1/3)：117-133.
[10]	LOCKHART N C. Electroosmotic dewatering of clays. I. Influence of voltage[J]. Colloids and Surfaces，1983，6(3)：229-238.
[1]	林育梁. 软岩工程力学若干理论问题的探讨[J]. 岩石力学与工程学报，1999，28(6)：690-693.(LIN Yuliang. The research on several theoretical problems about engineering mechanics of soft rock[J]. Chinese Journal of Rock Mechanics and Engineering，1999，28(6)：690-693.(in Chinese))
[7]	LOCKHART N C. Electro-osmotic dewatering of fine tailings from mineral processing[J]. International Journal of Mineral Processing，1983，10(2)：131-140.
[11]	BANERJEE S，VITAYASUPAKORN V. Appraisal of electro-osmotic oedometer tests[J]. Journal of Geotechnical Engineering，1984，110(8)：1 007-1 023.
[17]	袁国辉，胡秀青，刘飞禹，等. 絮凝-逐级加压电渗法改良疏浚淤泥试验研究[J]. 岩石力学与工程学报，2020，39(增1)：2 995-3 003.(YUAN Guohui，HU Xiuqing，LIU Feiyu，et al. Experimental study on the improvement of dredged slurry by flocculation-step-by-step loading voltage electro-osmosis method[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(Supp.1)：2 995-3 003.(in Chinese))
[19]	王宁伟，矫军，修彦吉. 电极距对水平电渗排水影响的试验研究[J]. 岩土工程学报，2012，34(增1)：177-181.(WANG Ningwei，JIAO Jun，XIU Yanji. Effect of electrode spacing on standard electro-osmotic dewatering[J]. Chinese Journal of Rock Mechanics and Engineering，2012，34(Supp. l)：177-181.(in Chinese))
[21]	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(3/4)：218-224.
[27]	OU C Y，CHIEN S C，CHANG H H. Soil improvement using electroosmosis with the injection of chemical solutions：field tests[J]. Canadian Geotechnical Journal，2009，46(6)：727-733.
[2]	MITCHELL J K，SOGA K. Foundamentals of soil behavior[M]. New York：John Wiley and Sons，2005.
[3]	冶金工业部建筑研究总院. 地基处理技术第五册基坑开挖与支护技术[M]. 北京：冶金工业出版社，1993：407-420.(Central Research Institute of Building and Construction，Ministry of Metallurgical Industry. Foundation treatment technology Volume 5 Foundation pit excavation and support technology[M]. Beijing：Metallurgical Industry Press，1993：407-420.(in Chinese))
[5]	LOCKHART N C. Electroosmotic dewatering of clays. II. Influence of salt，acid and flocculants[J]. Colloids and Surfaces，1983，6(3)：239-251.
[4]	CASAGRANDE I L. Electro-osmosis in soils[J]. Geotechnique，1949，1(3)：159-177.
[6]	LOCKHART N C. Electroosmotic dewatering of clays，III. Influence of clay type，exchangeable cations，and electrode materials[J]. Colloids and Surfaces，1983，6(3)：253-269.
[8]	SHANG J Q，DUNLAP W A. Improvement of soft clays by high-voltage electrokinetics[J]. Journal of Geotechnical Engineering，1996，29(2)：117-120.
[12]	SHANG J Q. Electroosmosis-enhanced preloading consolidation via vertical drains[J]. Canadian Geotechnical Journal，1998，35(3)：491-499.
[13]	刘艳晓，谢新宇，郑凌逶，等. 间歇注浆联合电渗加固软土的试验研究[J]. 科技通报，2019，35(6)：142-148.(LIU Yanxiao，XIE Xinyu，ZHENG Lingwei，et al. Experimental study on electroosmosis combined[J]. Bulletin of Science and Technology，2019，35(6)：142-148.(in Chinese))
[14]	杨克军，袁国辉，符洪涛，等. 通电方式对电渗加固软土影响试验研究[J]. 水利水电技术，2020，51(2)：170-176.(YANG Kejun，YUAN Guohui，FU Hongtao，et al. Experimental study on influence of electrification method on soft soil enhanced by electroosmosis[J]. Water Resources and Hydropower Engineering，2020，51(2)：170-176.(in Chinese))
[16]	林雪松，陈殿强，王来贵，等. 静载、振动和电渗作用下尾黏土固结的试验研究[J]. 实验力学，2020，35(3)：503-510.(LIN Xuesong，CHEN Dianqiang，WANG Laigui，et al. Experimental study on tailing clay consolidation under action of static loading，vibration and electro-osmosis[J]. Journal of Experimental Mechanics，2020，35(3)：503-510.(in Chinese))
[18]	李瑛，龚晓南. 等电势梯度下电极间距对电渗影响的试验研究[J]. 岩土力学，2012，33(1)：89-95.(LI Ying，GONG Xiaonan. Experimental research on effect of electrode spacing on electro-osmotic dewatering under same voltage gradient[J]. Rock and Soil Mechanics，2012，33(1)：89-95.(in Chinese))
[20]	陶燕丽，周建，李一雯. 电渗法中电极布置形式的对比试验研究[J].建筑结构，2013，43(增2)：214-218.(TAO Yanli，ZHOU Jian，LI Yiwen. Electro-osmotic experimental research on three arrangements of electrodes[J]. Building Structure，2013，43(Supp.2)：214-218.(in Chinese))
[22]	ACAR Y B，ALSHAWABKEH A N. Principles of electrokinetic remediation[J]. Environmental Science and Technology，1993，27(13)：2 638-2 647.
[23]	CHIEN S C，OU C Y，LO W W. Electro-osmotic chemical treatment of clay with interbedded sand[J]. Proceedings of the Institution of Civil Engineers-Geotechnical Engineering，2014，167(1)：62-71.
[24]	李荻. 电化学原理[M]. 北京：北京航空航天大学出版社：2008：103-109.(LI Di. Electrochemical principle[M]. Beijing：Beijing University of Aeronautics and Astronautics Press，2008：103-109.(in Chinese))
[15]	王宁伟，汤永强. 珠海流塑状软黏土电动化学加固工程实例[J]. 工程勘察，2020，48(11)：20-23.(WANG Ningwei，TANG Yongqiang. Case study of electrokinetic ground improvement of extremely soft clay in Zhuhai[J]. Geotechnical Investigation and Surveying，2020，48(11)：20-23.(in Chinese))
[25]	吴辉. 软土地基电渗加固方法研究[博士学位论文][D]. 北京：清华大学，2015.(WU Hui. Soft soil improvement by electro-osmosis techniques[Ph. D. Thesis][D]. Beijing：Tsinghua University，2015.(in Chinese))
[26]	史成江. 混合土(粉质黏土与疏浚土)作为填埋场衬垫系统材料的试验研究[硕士学位论文][D]. 杭州：浙江大学，2005.(SHI Chengjiang. Properties of mixed soil(silty clay and dredged soil)used as impermeable materials in clay liner of landfill[M. S. Thesis][D]. Hangzhou：Zhejiang University，2005.(in Chinese))