Dielectric constants of deep frozen clay soils of Longgu mine (0.1∼1GHz)

Based on the dielectric constant distinction between frozen and unfrozen soils, Ground Penetrating Radar(GPR) were widely used on frozen soils detection. However, the study of frozen soils dielectric constant was focused on the natural permafrost at land surface, and there were no current research achievement about deep frozen soils dielectric constant. Traditional methods such as Common Middle Point (CMP) and Common Depth Point (CDP) could not be used to measure the dielectric constants of deep frozen soils because of the complexity of underground engineering so that we applied laboratory tests to the Dielectric constants of several typical mine soil samples at 0.1∼1GHz, −30∼25°C, and different water content by using Vector Network Analyzer (VNA), and established the empirical formula. The research findings could be applied to ground penetrating radar detection, electromagnetic wave tomography etc., and used in quantitative inversion of frozen soil temperature field and safety evaluation of frozen soil engineering.