Cold Regions Highway In Permafrost Deformation Of Foundation Field Monitoring And Numerical Analysis

Deal with the problem of road foundations in cold regions has been a popular academic issues, which is determined by the characteristics of the cold regions, due to the freeze-thaw cycle with climate change, cold roads and bridges subgrade deformation always reflect instability, and therefore its temperature field monitoring and deformation monitoring is necessary, the foundation of the cold regions in the past There are many ways, such as gravel pile to deal with the soft ground and permafrost foundation, replacement gravel processing permafrost foundation and soft ground, the striker farm to Nenjiang highway based on the project, select a cement stabilized gravel pile sections of permafrost foundation for the test section, the engineering geological conditions of the site investigation, and draw the engineering geological map, in order to the laying of the monitoring equipment to provide a theoretical basis; live undisturbed soil sampling and laboratory test to determine the physical and mechanical properties, provide a theoretical basis for the choice of the permafrost foundation approach; introduction of cement stabilized gravel pile construction process, The coring site measured unconfined compressive strength of permafrost foundation pile compliance with treatment standards; the melting of the permafrost foundation of the test section using cement stabilized gravel pile permafrost foundation, as well as unused cement stabilized gravel pile treated rate and deposition rate monitor, and predict the time when the test section area permafrost completely melted;-site monitoring of the vertical deformation of the test section, were fitted using the hyperbolic method for settlement, to determine the hyperbolic method in predicting permafrost foundation settlement amount on the feasibility; the transverse deformation of the test section of the monitoring and analysis, the roadbed stability in permafrost foundation and then the cement stabilized gravel pile processing, evaluation of cement stabilized gravel pile to deal with the effects of permafrost foundation. The results show that:the test section of the soil properties of highly compressible silty clay; cement stabilized gravel pile on-site core unconfined compressive strength test results show that the cement stabilized gravel pile of unconfined compressive strength to meet the freeze land-based pile strength standards; temperature and vertical displacement monitoring results show that the cement stabilized gravel pile on the foundation of the permafrost melting rate and deposition rate has a role in mitigation; settlement fitting results show that the hyperbolic method can be applied to frozen ground fitting prediction of foundation settlement, and the fitting correlation coefficient of the load stable and accurate; lateral displacement monitoring results show that, in line with the requirements of the permafrost foundation stability.