Highway Diagnostics by GPR Method in Cryolitic Zone Based on Example of Federal Highway «Vilyui» Section

Summary Experimental research was carried out in order to improve diagnostics methods of roads operated in cryolitic zone. Results of ground-penetrating radar diagnostics at the Vilyui federal highway in Central Yakutia are presented. Data was obtained by OKO-2M GPR with AB-400 antenna unit (LogiS LLC). Attributes for interpretation of GPR wave fields are developed based on characteristics of GPR signals propagation in the road soils. Further it is used for mapping various cryogenic structures. For example, to identify water invasion zones at boundaries of the structural layers of the road surface and the roadbed, to determine zones of soil decompression at the subgrade support, to identify areas of swelling soils. As a result, GPR monitoring as part of engineering and geological survey allows reasonably plan and carry out actions to eliminate and prevent various types of subsidence and destruction of road surfaces, as well as to assess the nature and level of negative cryogenic processes.