电势梯度对冻结黄土电渗效果影响的试验研究  

Experimental study on the influence of electric potential gradient on the electroosmosis effect of frozen loess

作　　者：金豆豆 张泽 冯文杰[1] 王金国 岳攀 杨曙光 JIN Doudou;ZHANG Ze;FENG Wenjie;WANG Jinguo;YUE Pan;YANG Shuguang(State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Science,Lanzhou 730000,China;School of Civil Engineering/Institute of Cold Regions Science and Technology,Northeast Forestry University,Harbin 150040,China;University of Chinese Academy of Sciences,Beijing 100049,China;Northeast-China Observatory and Research-Station of Permafrost Geo-Environment-Ministry of Education/Coordinated Innovation Center for Permafrost Environment and Road Construction and Maintenance in Northeast-China,Northeast Forestry University,Harbin 150040,China;Yalong River Hydropower Development Company,Chengdu 610051,China)

机构地区：[1]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000 [2]东北林业大学土木工程学院/寒区科学与工程研究院,哈尔滨黑龙江150040 [3]中国科学院大学,北京100049 [4]东北多年冻土区地质环境系统教育部野外科学观测研究站(东北林业大学)/东北多年冻土区环境、道路建设与养护协同创新中心(东北林业大学),哈尔滨黑龙江150040 [5]雅砻江水电开发有限公司,四川成都610051

出　　处：《冰川冻土》2021年第4期1083-1091,共9页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41771078;41871061);国家自然科学基金委员会(NSFC)与俄罗斯基础研究基金会(RFBR)合作交流项目(42011530083);雅砻江流域水电开发有限公司科学技术项目(YLLHK-LHA-2019006);中国地质调查局发展研究中心《找矿哲学研究》项目(D219043);俄罗斯基础科学基金委员会-中国国家自然科学基金委员会合作交流项目(《ГФЕНа》-20-55-53006)资助~~

摘　　要：研究发现,通电作用下冻土中的未冻水会发生迁移,这种持续的迁移是一个复杂的物理化学过程,并最终伴随着冻胀的过程。为了探究这一电场作用对冻土的影响,选取冻结冻胀敏感性较高的粉质兰州黄土作为研究对象,分析其在3、4和5V·cm-1电势梯度作用下的阴阳极变形量、通电前后水分分布规律和电流及电能损耗。结果表明:随着电势梯度的增大,土体阴阳极变形量的差值逐渐增大,且阴极都发生膨胀,阳极发生沉降;随着电势梯度的增大,水分由阳极至阴极的迁移量增大,电流降低的幅度增大,两者变化特征与含水率差值变化特征类似;在5V·cm-1的电势梯度下,电能总能耗最大,单位含水率能耗最小。Studies have found that unfrozen water in frozen soil will migrate under the action of electrification.This continuous migration is a complex physical and chemical process and is eventually accompanied by a pro⁃cess of frost heave.Laboratory tests of frozen Lanzhou loess were conducted to investigate the electro-osmosis effects of deformation,distribution of water content,current and energy consumed of each test,the following conclusions were drawn.With the increase of the electric potential gradient,the difference between the deforma⁃tion of the anode and the cathode of the soil gradually increases,and the cathodes both expand and the anodes settle;with the increase of the electric potential gradient,the amount of water migration from the anode to the cathode increasing,the amplitude of current reduction increases,and the change characteristics of the two are similar to the change characteristics of the water content difference;under a potential gradient of 5 V∙cm-1,the total energy consumption of electric energy is the largest,and the energy consumption per unit of water content is the smallest.

关 键 词：冻土 电渗 电势梯度 冻胀 水分迁移 

分 类 号：P642.14[天文地球—工程地质学]