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可调控通风管路基是一种理想的保护高温冻土的工程措施。针对青藏铁路高温冻土段存在的冻融问题,考虑太阳辐射和附面层对边界条件的影响,通过对传统和可调控通风管路基进行详细的数值仿真分析,结果表明:可调控通风管路基在夏季(8月份)0℃的等温线比传统的通风管路基要高,说明其冻土上限抬升较高,冻土会得到更好保护,并且其路基下面也不会出现融化盘;冬季(3月份)-4℃的等温线传递深度要比传统通风管路基深,其对路基基层冻土的降温速度和冷却效果要明显优于传统的通风管路基。
Adjustable ventilation duct foundations is an ideal engineering measure to protect permafrost. Considering the frost and thaw problems in the permafrost zone of Qinghai-Tibet Railway, considering the influence of solar radiation and boundary layer on the boundary conditions, a detailed numerical simulation of the traditional and adjustable control ventilation duct found that: The isotherm of 0 ℃ in summer (August) is higher than that of traditional ventilation pipelines, indicating that the upper limit of permafrost is higher, the permafrost will be better protected, and the melting plate will not appear below the embankment. In winter ( March) -4 ℃ isothermal transfer depth than the traditional ventilation ducts deep, its subgrade permafrost cooling rate and cooling effect is significantly better than the traditional ventilation duct embankment.