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通过瞬态温度场的导热微分方程,采用伽辽金法推导出带相变的三维温度场有限元计算公式,建立了通风路基温度场的空间计算模型。对青藏铁路中年平均气温在-4.3℃,地表年平均温度-1℃的路段,考虑气候变暖,根据预测在未来50a气温上升2.6℃的情况下,对铺设与不铺设保温材料的通风路基温度场进行了数值计算和对比分析,为设计、施工部门提供了理论参考。
Based on the differential equations of thermal conduction in transient temperature field, the finite element method of three-dimensional temperature field with phase transition was deduced by the Galerkin method. The space calculation model of the temperature field in the ventilated roadbed was established. Considering the warming of the Qinghai-Tibet Railway at the middle-aged average temperature of -4.3 ℃ and the average annual surface temperature of -1 ℃, according to the prediction of the air temperature rise of 2.6 ℃ in the future 50 years, the ventilation subgrade with or without laying insulation material The temperature field is calculated and analyzed comparatively, which provides the theoretical reference for the design and construction department.