盐渍土电阻率试验研究

为了更深入的了解土体电阻率的特性,使其在理论与工程应用上发挥作用,对甘肃瓜州盐渍土进行电阻率室内试验,通过控制含水率、含盐量、干密度三个因素进行正交测试,分别研究了电阻率随含水率、含盐量、孔隙率及饱和度的变化规律及特点。试验表明:盐渍土电阻率随含水量、饱和度的增加呈减小趋势,随孔隙率的增加而增加,在孔隙液未饱和阶段随含盐量增加而下降,在过饱和阶段变化不明显,各因素互相影响,共同作用。由室内试验获得的数据提出经验模型公式,为工程中电法勘探的结果验证与反演解释提供依据。

RESEARCH ON ELECTRICAL RESISTIVITY TEST OF SALINE SOIL

For a better understanding of the characteristics of the soil electrical resistivity and let it play a role in theory and engineering applications,the electrical resistivity laboratory tests on saline soil in Guazhou of Gansu Province were made,orthogonal test was carried out by controlling the three factors of water content,salinity and dry density,relationships and characteristics among resistivity and water content,salinity,porosity and saturation were studied.Results show that: saline soil resistivity decreases with the increase of water content and saturation,increases with the increase of porosity,change with salinity relates to degree of salt dissolved,it decreases with the increase of salinity when the pore fluid is unsaturated and does not change significantly when the pore fluid is supersaturated,various factors affect each other and work together.An empirical model formula from the data obtained from laboratory test is proposed and it can provide the basis for results validation and inversion by electrical prospecting in project.