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基于Harlan一维水热耦合模型对多年冻土地区水分场、温度场耦合计算进行探讨,建立了水热耦合二维物理模型。对该模型采用伽辽金有限元法和隐式有限差分数值离散,结合某实际高原铁路路基工程进行数值计算,分析了修筑铁路路基对原天然路面热稳定的影响,并对未来十年内全球气候变暖对路基的影响进行了数值模拟,考察了多年冻土上限的变化情况。结果表明:铁路路基改变了原天然地面的传热形式,因而有条件地提高了路基下多年冻土上限,而全球气候的变暖,将对建筑在多年冻土上的铁路路基热稳定性产生影响。
Based on the Harlan one-dimensional hydrothermal coupling model, the coupling calculation of water field and temperature field in permafrost region is discussed, and a two-dimensional hydrothermal coupled physical model is established. The Galerkin finite element method and implicit finite difference numerical discretization are used in this model. The numerical calculation of a practical plateau railway embankment project is carried out. The influence of building railway subgrade on the thermal stability of the original natural pavement is analyzed. The global climate The influence of warming on subgrade is numerically simulated and the change of upper limit of permafrost is investigated. The results show that the railway embankment changes the heat transfer form of the original natural ground and thus increases the upper limit of the permafrost conditionally under the subgrade. However, the global warming will affect the thermal stability of the railway subgrade built on the permafrost influences.