Результаты экспериментальных георадиолокационных обследований ледовых переправ и автомобильных дорог Якутии

Abstract

Experimental studies of applicability of GPR for surveying structure and condition of a subgrade road surfaces and ice crossings were conducted for purpose to improve diagnostic methods for сryolithozone roads. The studies were performed on the example of the ice crossing «Yakutsk-Nizhny Bestyakh», the underlying rocks of the asphalted road «Nizhny Bestyakh-Maya» and the earth road «Amga». The data were received by a georadar OKO-2M with the antenna assembly AB-400 (LLC «LogiS»). Practical results of contact and radar measurements of the river ice thickness on the ice crossing and the road surface of the highway are presented. A map of distribution of the river ice thickness was generated based on the measured data and the weight carrying capacity of the ice crossing throughout its length was evaluated. The structure of the constructional layers of subgrade road surface «Amga» was explored and thickness of landfilling was estimated. The 180 meters of a contrast lens of material with high moisture on the section «Yakutsk–Nizhny Bestyakh» is shown based on the GPR data. In this area cryogenic action processes and further damage of the asphalt road covering are expected. The ability of GPR for determining a thickness of river ice in a place of ice crossings and the a thickness of structural layers of a road pavement with identification of areas of high humidity and highways soil decompression is demonstrated.