环境化学条件对软土电渗排水影响的试验研究  

Experimental study of effect of geochemical conditions on electro-osmotic consolidation of soft soils

作　　者：张林[1,2] 胡黎明[2,3,4] ZHANG Lin;HU Liming(School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Hydrosphere Sciences of the Ministry of Water Resources,Tsinghua University,Beijing 100084,China;Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]华北电力大学水利与水电工程学院,北京102206 [2]清华大学水圈科学与水利工程全国重点实验室,北京100084 [3]清华大学水利部水圈科学重点实验室,北京100084 [4]清华大学水利水电工程系,北京100084

出　　处：《水力发电学报》2024年第6期33-42,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金资助项目(51979144);清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2022-D-02);中央高校基本科研业务费专项资金资助(2022MS050)。

摘　　要：电渗排水在软土地基加固方面具有较大的应用前景。为研究土体环境化学条件对软黏土电渗排水过程的影响,开展了一系列室内试验,从电渗系数、排水量、排水速率、含水率分布等方面进行了对比分析,深入探讨土体pH值和盐度对电渗排水过程的影响机理。试验结果表明:土体pH值对土体的电渗系数和zeta电位均有明显影响,电渗系数随着pH值的升高而升高,通过测量zeta电位可以准确获取电渗系数;随着土体初始pH值的升高,电渗排水试验后阳极附近土体的含水率逐渐降低,阴极附近土体的含水率逐渐升高;在对较酸性土体的电渗试验中则出现了阴极附近土体排水固结较快的现象,对土体的整体排水过程产生不利影响;随着土体盐度的升高,电渗系数和电渗总排水量降低,能耗增大。低盐度、偏碱性的环境有利于提高电渗加固效果。Electro-osmotic consolidation is a promising method to treat soft soils.A series of experiments are conducted in this study to investigate the influence of soil pH value and salinity on the electro-osmotic consolidating process of soil.The coefficients of electro-osmotic permeability,total volume of the discharged water,drainage rate,and water content are obtained,verifying the coefficient of electro-osmotic permeability and Zeta potential are affected significantly by soil pH value.It is practicable to predict the coefficient of electro-osmotic permeability,which increases with the initial soil pH value,by measuring zeta potential.For the samples with higher initial soil pH value,water content after the experiment is decreasing near the anode and increasing near the cathode.As soil salinity increases,the electro-osmotic permeability and drainage rate are both decreasing,while energy consumption is increasing.This study indicates that the soft soil with low salinity and high pH value is favourable for electro-osmotic consolidation.

关 键 词：电渗加固 电渗系数 土体pH值 土体盐度 软土 

分 类 号：TU472[建筑科学—结构工程]