土的电阻率与饱和度的关系研究

采用自制的绝缘模型进行砂土、黄土、黏土的室内电阻率和饱和度的试验.分析数据可知,三种土样的共同点是：电阻率随着饱和度的增大,幂函数关系减小;当土样接近饱和时,电阻率趋于稳定.不同点是：在干密度和饱和度相同时,砂土的电阻率最大,黏土的电阻率最小;砂土的电阻率对饱和度变化的敏感性强于黄土和黏土.本试验揭示了砂土、黄土、黏土的电阻率与饱和度的关系,为使用电测法测量土工参数提供了理论依据.

Study of Relationship between Electrical Resistivity and Saturation Degree of Soils

In this paper, a homemade insulated model has been used for measuring the electrical resistivity and saturation degree of sandy, loess and clay. According to the data analysis, the common characteristics of the three kinds of soil samples are listed following： With the increase of saturation degree of soil, the decrease of electrical resistivity is a power function. When the soil sample is closed to saturation, its resistivity is stable. The difference characteristics indicate when the dry den- sity and saturation degree are the same, the resistivity of sand is maximal, and the resistivity of clay is minimal; the sand resistivity change is more dramatic than loess and clay in saturation changes. This paper reveals the relationship between electrical resistivity and saturation degree of soils, to provide a theoretical basis for the use of electrical measuring method to measure geotechnical parameters.