Effects of subbase geogrid reinforcement on residual deformation characteristics of asphalt pavement

This study focuses on the residual deformation properties of the subbase of asphalt pavement subjected to traffic loading. A series of laboratory model tests was performed on asphalt pavement to investigate the effect of wheel loading on the stress conditions and deformation properties of subbase aggregates. From the results, it was confirmed that residual settlement of the subbase is affected by the following two loading conditions; a) cyclic loading from both normal and shear stresses, and b) rotation of the principal stress axes. Residual deformation of the subbase is closely related to the stability of the surface asphalt layer. Therefore, reducing aggregate movement using soil improvement technology is important for maintain the long-term stability of the pavement structure. In this study, it was confirmed that applying geogrid reinforcing technology to the subbase can effectively reduce residual settling due to wheel loading.