寒冷地区铁路客运专线路基温度场数值模拟

Numerical simulation of thermal field in subgrade of passenger dedicated railway line in cold region

寒冷地区铁路客运专线路基温度场的分布影响着路基的冻胀性.以哈大客专大连段路基为研究背景,结合当地气候条件及地质资料,运用有限元软件模拟路基冬季温度场,分析路基温度场在冬季各月份的分布情况及不同年份下路基温度场的变化.结果表明:采用数值方法能够模拟路基在冬季的温度场分布.路基的主要区域在冬季均出现负温条件,在实际分析时应考虑阴阳坡对路基温度场分布的影响.随着年份的增加,在同一时期的路基温度场的负温条件会逐渐减小,气候变暖对路基温度场分布的影响较显著.

The frost heave is influenced by the distribution of thermal field of the subgrade of passenger dedicated railway line in cold region. Based on the background of the subgrade in Dalian of Dalian-Harbin Passenger Dedicated line and combined the local climate condition and geological data, the thermal field in subgrade is simulated by finite element software; and then the distribution of thermal field in subgrade in different months in winter and the change of thermal field under different years are analyzed. The results show that the thermal field in winter can be simulated by using numerical method. In main areas of sub- grade, negative temperatures appear in winter; and the effects of sunward and shady aspects should be considered in the distribution of thermal field in actual analysis. The negative temperatures of thermal field in subgrade decrease with the increasing of years in the same period; and the global warming has a signifi- cant effect on the distribution of thermal field.