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风火山隧道是青藏铁路的控制性工程之一,全隧道位于多年冻土之中,这种特殊隧道的温度分布将直接影响隧道结构的稳定性。根据带相变瞬态温度场问题的热量平衡控制微分方程,应用Galerkin法推导出了三维有限元计算公式。根据风火山隧道内的实测大气温度,利用三维有限元计算公式,计算分析了该隧道在未来50 a的温度特性,并与现场实测围岩温度进行了对比分析,分析表明计算理论、模型、参数和条件是可靠的,风火山隧道在未来50 a内不会出现季节性融化。从而为寒区工程设计提供理论依据和计算方法。
The Fenghuo Mountain Tunnel is one of the controlled projects on the Qinghai-Tibet Railway. The whole tunnel is located in permafrost. The temperature distribution of this special tunnel will directly affect the stability of the tunnel structure. According to differential calculus of heat balance with transient temperature field with phase transition, a three dimensional finite element formula is deduced by Galerkin method. According to the measured atmospheric temperature in the Fenghuoshan tunnel, the temperature characteristics of the tunnel in the next 50 years are calculated and analyzed by using the three-dimensional finite element formula. The temperature of the tunnel is compared with the measured field temperature. The analysis shows that the calculation theory, model, parameters And the conditions are credible, the Fenghuoshan Tunnel will not be seasonally melted in the next 50 years. So as to provide theoretical basis and calculation method for cold engineering design.