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文章针对青藏高原在未来50年内气温将升高2.6℃的气候条件对青藏铁路风火山隧道围岩的冻融状态有何影响的问题,本文推导了带相变瞬态温度场的有限元公式。运用这些公式,预测了在气候变暖条件下风火山隧道浅埋段围岩的温度场分布和最大季节性融化深度的变化规律,分析表明:青藏铁路风火山隧道在气候变暖条件下,隧道衬砌附近围岩将会出现季节性融化,且最大季节性融化深度也是随着冻融循环的增加而增加的,这样隧道可能会出现冻害,应该及时采取防冻害措施。
In this paper, aiming at the problem of the influence of climatic conditions in Qinghai - Tibet Plateau on the surrounding rock of Fenghuoshan Tunnel in Qinghai - Tibet Railway in the coming 50 years, the influence of the climatic conditions on the freezing and thawing of the surrounding rocks of Fenghuoshan tunnel is analyzed. Using these formulas, the variation law of the temperature field and the maximum seasonal melting depth of the surrounding rock in the Fenghuoshan tunnel under the condition of warming is predicted. The analysis shows that under the condition of the climate warming, the tunnel lining The nearby surrounding rocks will have seasonal melting, and the maximum seasonal melting depth also increases with the increase of freeze-thaw cycles, so the tunnels may freeze and the frost damage measures should be taken promptly.