The Hydro Thermal Mechanics Analysis Of Roadbed Of Railway In Seasonally Frozen Soil Region

With the rapid development of C hina’s high-speed railway,the railway embankment appeared in large numbers, which seriously affect the security and stability operations througho ut the high-speed rail network,especially the stability of deep seasonal permafrost zone is particularly important. As the seasons change, in seasonal permafrost zone the railway’s freeze-thaw damage is affected by the interaction of temperature field,moisture field,stress field,whose deformation and failure process is extremely complex and is influenced by many factors,but the research of this area is relatively weaker.In this paper,firstly, according to some previous studies and the theory of frozen soil, introduce the disease and causes of railway embankment in seasonal frost zone;secondly,by the coupled numerical simulation temperature,seepage and deformation field of the seasonal embankment in permafrost zone,analyze the frost thaw settlement mechanism;finally through the analysis of the different factors that affect the stability of the roadbed,according the results of the analysis,propose the prevention measures against diseases of seasonal railway embankment.The main research contents:(1)On the basis of previous studies,improve thetemperature,seepage,deformation field equations,propose permafrost the coupled equations of moisture- heat-stress flied.(2)Using the finite element software Comsol Multiphysies,calculate the rail way roadbed of seasonal frozen soil with the fully coupled methord of the mo isture-heat-stress field,summarize the regula rpattern temperature,seepage,deforma tion field of railway embankments.(3)By comparing the results of the different porosity,different ratio of the elastic modulus of frozen state fE and melt state lE and lues of the state and the water conditions outside railway subgrade,concludes whice will have different degree influent to the frost-thaw deformation of the raily embankment in seasonal frozen soli.(4)Summarize the disease and causes of railway roadbed in deeply seasonal forzenzone.According to the factors affecting of its stability, propose appropriate control measures.