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青藏铁路路基的热稳定性受到气温升高的影响.站场路堤比普通路堤宽度大,受气温升高影响更大.以清水河站场试验点为工程背景,对站场和普通路基3个冻融周期的现场测试温度进行分析比较.参照前人对气温预测计算公式,作为青藏铁路站场路基进行热分析的边界条件,运用数值计算方法近似求解计算站场路基20 a后的热状况,同时与普通宽度的路基作比较.结果表明,站场路堤的多年冻土的人为上限比普通路堤高,最大融深比普通路堤大,说明路基的宽度是加速冻土破坏的一个重要影响因素.
The thermal stability of the Qinghai-Tibet Railway embankment is affected by the temperature rise.The embankment of the station yard is wider than that of common embankment and is more affected by the temperature rise.With the experimental site of Qingshuihe Railway Station as the engineering background, Freezing and thawing period of the field test temperature analysis and comparison.Considering predecessors on the temperature prediction formula for the Qinghai-Tibet Railway Station Roadbed thermal analysis of the boundary conditions, the use of numerical methods to approximate calculation of the site subgrade after 20 a thermal conditions, The results show that the artificial upper limit of permafrost in station embankment is higher than ordinary embankment and the maximum embankment depth is greater than that of common embankment, which shows that the width of embankment is an important factor to accelerate the destruction of frozen soil.