Study On The Seasonal Frozen Roadbed Temperature And Deformation Of Kangding Section Of Sichuan-Tibet Highway

Taking the Sichuan-Tibet highway for example, comprehensive consideration many actual meteorological factors such as solar radiation,air temperature,wind velocity and landform, Site selection observation section temperature field and the pavement on deformation of roadbed measured.Through the research and analysis of measured data for natural surface, roadbed midline, slope geothermal change characteristics. Analyzed the asphalt pavement, route toward, altitude and landform on embankment temperature field distribution of specific effect.Through the analysis of pavement deformation to verify the season permafrost regions pavement deformation and roadbed temperature field of the mutual relationship.Points out the seasonal frost soil are the main part of the road deformation in zero fill or excavation sections.Based on experiment and sum up, the paper obtains the heat-conducting coefficient and heat specifil volume of sub-clay and grit soil. Through the analysis and induction of the solar radiation on the slopes of both road sides, the paper obtains a calculation foemula for the slope solar radiation and the vaules for the subgrade with different dip angle and strike (Don't consider atmospheric effects). By simulating the complicated boundary conditions and using the software, a two-dimensional calculation model is suggested in this paper,it can be used to analyze the distribution of roadbed temperdture through calculation and field measurement for mutual contradt,confirmed the rationality of the calculation. The author fond different direction of the roadbed with asymmetric temperature field distribution characteristics, and this characteristics is strong in winter and weak in summer.The author points out that the right shoulder of east-west toward is the easiest position to produce frost heaving and thaw. According to field measurement and modeling analysis gives the maximum depth of frozen soil of kangding region under the different mean annual temperatures.The conclusion present reference for the design of the highway roadbed in kangding region.