Analysis Of Working Behavior Of Bridge Pile In Frozen Soil During The Period Of Freezing

With the implementation of the development of China's economy and the western development strategy,from the distribution of frozen soils in China,the construction in permafrost regions will become more frequent,but for the construction of permafrost regions lack less,so far,China's high-speed train in permafrost regions is less and less,the progress of implementation,which will greatly reduce the the strategy for the development of the construction and design is very necessary to study the permafrost regions,this paper will study the change of working state of pile foundation in the whole freezing period,to further improve the design and construction of permafrost regions.The main work done in this paper has the following several aspects.First of all,according to the research of the current pile foundation in permafrost region,establish to study the direction of the workability of during the period of "analysis of pile foundation in the frozen state",according to the content of the study,master about theory;Secondly,in the engineering background of proving ground of pile foundation,pile soil temperature field numerical simulation with finite element software,and the simulation results with the measured data,this paper compares and analyzes the reasonable simulation parameters.On this basis,research on the temperature field of the project,will further pile soil thermal model for the thermal structure model,temperature field model as the body load applied to the structural model for stress so as to extract the pile nodes along radial direction and depth direction;Finally,to determine the tensile compressive formula of concrete in the continuous low temperature curing,and calculate the strength development of concrete's own data,the model will be its own data and concrete strength development force data summary,curve drawing both by Origin,working state,comparative analysis of pile foundation concrete,and analyzes its reason,research the results can provide a reference for the design and construction of bored pile in permafrost conditions.