Experimental investigation of resistivity characteristics in coastal saline soils

Soil resistivity is a fundamental electrical property and a critical parameter for evaluating soil corrosivity, designing grounding systems, and ensuring electrical safety. In this study, comprehensive laboratory tests were conducted on coastal saline soils to investigate the effects of alternating current (AC) frequency, water content, salinity, and dry density on electrical resistivity. The experimental results indicated that soil resistivity decreased significantly with increasing AC frequency, with 1000 Hz identified as a practical testing frequency for the tested coastal saline soil. Furthermore, the resistivity exhibited a power-law relationship with both water content and dry density, while demonstrating a strong inverse relationship with salinity. Based on the experimental data, a prediction model was established. This model would provide a reliable theoretical framework for grounding engineering and corrosion mitigation in coastal saline environments.