路基温度场数值模拟及变化规律研究

Research on the Numerical Simulation and Change Rules of the Subgrade Temperature Field

建立了路基温度场的数值分析模型,基于ANSYS软件分析了路基温度场的分布规律及时变特性。研究表明:路基竖向温度场随深度的增加温度升高,一月份最冷时的路基冻深约为2.0 m;环境温度对路基横向温度场的影响范围约为2.0 m,与路基冻深一致。路基内部不同位置处全年的温度变化与环境温度变化趋势基本一致。路表处的温度与环境温度基本相同,路基内部温度变化受环境温度变化影响较小,路基深处土体处于多年冻结或季节性冻结状态。

Numerical analysis model of the subgrade temperature field was established. Based on the pro-gram ANSYS, the distribution and the time-varying properties of the subgrade temperature field were analyzed. Results show that for the vertical subgrade temperature field, the temperature increases with the depth increasing, and the subgrade frost depth at the coldest time in January is about 2.0 m. The ambient temperature affects the horizontal subgrade temperature field within a scope of about 2.0 m, which is the same as the subgrade frost depth. Temperature change trend of various positions in the subgrade during a year basically agrees with the ambient temperature change trend. The temperature of the pavement surface is basically the same as the ambient temperature, while the ambient temperature affects a little on the subgrade temperature, and soil in the depths of the subgrade keeps permafrost, or seasonal frozen.