Analysis And Treatment Of The Uneven Deformation For Qinghai-Tibet Highway's Subgrade And Pavement

Qinghai-Tibet Highway is important. For its special environmental conditions and geographical, the freezing and thawing are prone to occur with the season changing, which may lead the uneven pavement deformation. In order to ensure driving comfort and driving safety, treatment measures for pavement inhomogeneous deformation is necessary to be proposed. It has important theoretical and practical significance for maintenance of pavement and subgrade.1. Based on the Qinghai-Tibet Highway on-site investigation, the analysis of the reasons for the development of inhomogeneous deformation and impact factors were proposed. The treatments for horizontal and vertical non-uniform deformation were also put forward.2. The model for inhomogeneous deformation was established and the inhomogeneous deformation caused by height of subgrade, modulus for the structure and thawing depth was analyzed.3. Based on the numerical calculation and theoretical analysis, the comprehensive treatment measures and criteria for non-uniform deformation of the Qinghai-Tibet Highway was presented.4. By finite element numerical simulation for the non-uniform deformation after treatment measures, the related technical parameters were determined.This paper focuses on the Qinghai-Tibet Highway pavement uneven deformation and its treatment measures. It provides the theoretical basis for treatment of the uneven deformation and is meaningful for the maintenance of Qinghai-Tibet Highway.