Numerical Simulation Of Subgrade Deformation In The Seasonal Freezing Region

In the seasonal freezing region, the Subgrade creat frost heave and thaw collapse on the effect of the water temperature change condition,this will cause the destruction of the roadbed and surface. In order to guarantee that roadbed intensity and stability, it is necessary to conduct the research to the roadbed distortion condition,this has the practical and the theory significance to the roadbed pavement design.This article carries out the numerical simulation on the roadbed distortion situation in the seasonal freezing region through the method which bond the laboratory experiment and the theoretical analysis.1.This paper stacks the meteorological conditions such as solar radiation and temperature ofâ…¡andâ…¢kind of boundary condition, have established finite element analytical model which company by the phase change of roadbed that is not stable temperature field. And it is studied that roadbed temperature condition in seasonal freezing area.2.According to the source of moisture in natural environment,have partly established the model of rainfall infiltration and the underground water growth which can truly reflec roadbed moisture source,and have analysed the moisture field distribution law based on this model.3. It had carried out different water content Subgrade soil rbound module test under different thaw-freeze cycle number,analyzed the relations of rbound module and the water content and the thaw-freeze cycle number of times, and it is unified theory analysis of the temperature field and the moisture content field, also studied the influence of the water temperature condition on the roadbed strength.4.It is based on calculation model of the unsteady temperature single-field and moisture single-field,proposed displacement field calculation model and the calculation flow in the seasonal freezing region. It has also analyzed the displacement field change of the roadbed in the freezed and the melted process of the influence of the temperature, the moisture content.This article's results which is beneficial to the quantification analysis of the frost heave and thaw collapse in the roadbed. It is provided the theoretical basis on the roadbed distortion research in the seasonal freezing region and also provided the further study on the coupling of the heat-moisture-stress field.