基于热传递的寒区铁路桥台温度场规律研究

Research on Temperature Field of Railway Abutment in Cold Region Based on Heat Transfer

寒区铁路桥台受恶劣气候条件带来的温度场变化影响,产生了多种结构病害并威胁着线路运营安全。针对这一问题,本文建立典型铁路桥台有限元模型,研究建设完工后一年周期内的温度场变化规律,分析了台前及台后土体一定埋深范围内地温曲线的变化特征,对比分析了不同土质条件下的冻结深度差异。研究表明:桥台完工后的初始温度影响了台后土的地温分布,桥台建设及台后土的填筑导致地温温度场进行了重分布;在初始温度相同情况下,土体参数的不同导致冻结深度不同,冻胀土体冻结深度明显大于不冻胀土体,本文计算的最大冻结深度达7 m。

Railway abutments in cold regions were affected by the temperature field caused by severe weather conditions,resulting in a variety of structural diseases,and threatening the safety of railway line operation.In response to this problem,this paper established a finite element model of a typical railway abutment,studied the temperature field variation rules within a one-year period after the completion of construction,analyzed the variation characteristics of the temperature curve within a certain buried depth range of soil in front of and behind the abutment,and compared and analyzed the differences in freezing depth under different soil conditions.The research shows that the initial temperature existing after the completion of the abutment affects the ground temperature distribution of the soil behind the abutment,and the construction of the abutment and the filling of the soil behind the abutment result in a redistribution of the ground temperature field.Under the same initial temperature,different soil parameters lead to different freezing depths.The freezing depth of frost heaving soil is significantly greater than that of non-frost heaving soil.In this paper,the maximum freezing depth can reach up to 7 m.