Conductivity characteristics of landslide considering porosity, saturation, temperature and ion concentration

High-density resistivity imaging method is widely used in landslide monitoring. The resistivity of rock and soil is closely related to factors, such as porosity, moisture content, saturation and temperature. In this study, the resistivity test was designed to investigate the influence of physical factors and pore solution components on the resistivity of landslide soil. Experimental and analytical results find that both moisture content and volumetric water content varies greatly under the same resistivity. At different temperatures, soil resistivity exhibits great changes. Under the same temperature, the ion concentration and species in pore solutions have great influence on soil resistivity. Based on the test results and grey correlation analysis, this study established a resistivity model by considering porosity, saturation, temperature and ion concentration. The study lays a foundation for the high-density resistivity method to measure the moisture content of landslides.