电渗软黏土电导率特性及其导电机制研究

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摘要在自制的Miller soil box中采用4相电极法分别模拟和研究电渗过程中含水率、温度和孔隙水含盐量的变化对软黏土电导率的影响。结果表明，黏土电导率随含水率变化经历3个阶段：含水率小于塑限时，电导率随含水率的增大而迅速增大；含水率大于液限时，电导率随含水率增大而缓慢减小；含水率在塑限和液限之间时，电导率随含水率的增大而缓慢增大。黏土导电性与受含水率影响的土体结构相态有关，导致土体电导率变化的导电途径依次为固液相互层、双电层和液限。温度的升高会导致电导率增大，二者成良好的线性关系，并且含水率越高电导率随温度增长的速率越慢。黏土电导率也随孔隙水含盐量的增大而增大，但是黏土含水率越高，孔隙水含盐量变化对电导率的影响越大。

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	李瑛
	龚晓南
	郭彪
	周志刚

关键词 ：土力学, 电导率, 电渗, 含水率, 温度, 含盐量, 导电途径

Abstract：A self-made Miller soil box was adopted to perform a standardized laboratory procedure for measuring clay electrical conductivity. The effects of three different factors including water content，temperature and pore water salinity on the conductivity were studied. The results show that the relation curve of conductivity and water content could be divided into three sections. With the increase in water content，electrical conductivity of clay increases rapidly before plastic limit，and then decreases slowly after liquid limit，and it is relatively smooth in the middle. The electrical conductivity of soil is relevant to its structural phase state which is subjected to the influence of water content，and alternating layers of solid-liquid，electrical double layer and pore water influenced the conductivity of clay in turn as the main conductance pathway with the increasing water content. Moreover，an increase in temperature will lead to an increase in electrical conductivity of clay. The higher the water content is，the less the increase rate of electrical conductivity with temperature is. An increase of salinity will result in an improvement of electrical conductivity. But the higher the water content is，the larger the influence of variation in salinity on electrical conductivity is.

Key words： soil mechanics conductivity electro-osmosis water content temperature salinity conductive pathway

引用本文:

李瑛，龚晓南，郭彪，周志刚. 电渗软黏土电导率特性及其导电机制研究[J]. 岩石力学与工程学报, 2010, 29(S2): 4027-4032.
LI Ying，GONG Xiaonan，GUO Biao，ZHOU Zhigang. RESEARCH ON CONDUCTIVITY CHARACTERISTICS OF SOFT CLAY DURING ELECTRO-OSMOSIS AND ITS CONDUCTIVE MECHANISM. , 2010, 29(S2): 4027-4032.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/4027

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