Georadar technologies application during determination of deformation characteristics of subgrade soils

Abstract

One of the main reasons that largely affects the premature destruction and shortening of the pavement service life is the mismatch of the pavement to the actual conditions of operation, which is due to incomplete information about the change in the estimated humidity, strength and deformation parameters of subgrade soil. In the calculations of road structures, the main parameter of the soil base is the modulus of elasticity. Dependences of the soil elasticity modulus with humidity, dependences of the dielectric constant with humidity were obtained, and the relation between the elasticity modulus and dielectric constant were established. Therefore, the article are formulated and solved the task of developing a express-method estimation of soil deformation parameters in the field using modern advanced technologies. The results of laboratory studies have shown that with increasing humidity the soil dielectric constant is doubled: for sanding loams from 4 to 9; for loam from 13 to 27; for clays from 15 to 31. The results obtained can be applied in the highways inspection process in the calculation period, as well as for the calculation of pavement stress-strain condition, taking into account changes in humidity.