Study On The Effect Of Cement Concrete Pavement Structure For Inhomogeneous Deformation Of Subgrade

If the inhomogeneous deformation of subgrade exceeds a certain limit, the cement concrete pavement will get destroyed. This paper studied on the inhomogeneous deformation of sub grade in the seasonal freezing region and non-frozen region respectively, established models for the inhomogeneous deformation of subgrade on the on the effect of various factors, then studied further on the additional stress of cement concrete pavement caused by the inhomogeneous deformation of sub grade, obtained the following results:1) Based on the existing cement concrete road disease investigation, concluded the type of inhomogeneous deformation of subgrade in the seasonal freezing region and non-frozen region, and analyzed influencing factors of the inhomogeneous deformation of subgrade. Based on the existing governing equations, established hydro-mechanical coupling models of subgrade in the non-frozen region and moisture-heat-stress coupling models of subgrade in the seasonal freezing region respectively, which considered different boundary conditions. Simulated and analyzed the inhomogeneous deformation of subgrade, concluded the types of inhomogeneous deformation of subgrade in the non-frozen region and seasonal freezing region according to the results.2) Calculated the internal stress of different layers of the same pavement structure under standard vehicle load using BISAR and ABAQUS finite element software, the result showed that ABAQUS finite element software can be used to calculate internal stress.3) Concluded the inhomogeneous deformation of subgrade to four representative types, established stress models of cement concrete pavement in the condition of inhomogeneous deformation of subgrade respectively, numerical simulated the effects of load stress of cement concrete pavement caused by inhomogeneous deformation of subgrade.4) Based on influencing factors of the inhomogeneous deformation of subgrade, deformation types, and the analysis on additional stress of pavement caused by the inhomogeneous deformation of sub grade, combined with natural environment feature of the seasonal freezing region and non-frozen region, proposed control principles for the inhomogeneous deformation of subgrade in the non-frozen region and seasonal freezing region respectively.