铁路路堑挡雪墙设计参数优化数值模拟

风吹雪往往在铁路路堑地段形成较厚的积雪,掩埋线路,影响行车速度,危及行车安全,研究其具有重要的现实意义。基于FLUENT软件,模拟研究不同挡雪墙高度、不同风速下,挡雪墙背风侧风雪两相流的运动特性及挡雪墙参数优化设计。研究表明,风雪流初始速度一定时,挡雪墙背风侧积雪宽度随挡雪墙高度增大而变大,沉积在床面上的雪粒更多,阻雪效果越好;挡雪墙高度一定时,背风侧积雪宽度随风雪流速度的增加逐渐增大,挡雪墙距线路的距离也应越大。在综合考虑工程造价和挡雪效果的基础上,挡雪墙设计时,高度宜在2.5~3.5m,高度越高,风速越大,挡雪墙距线路的距离应越大,一般在20~35m即可。

Numerical Simulation on Design Parameter Optimization of Railway Cutting Snow Retaining Wall

Wind blowing snow often accumulates thickly on railway cutting and buries the railway,affecting driving speed and endangering the traffic. It is important and of practical significance to studythe case. Based on FLUENT software, this paper conducts the simulation study of the movementcharacteristics of two-phase wind-snow flow at the leeward side of the snow retaining walls of differentheights and at different snow speed to optimize the design of the snow retaining wall. Study shows thatwhen the initial speed of wind-snow flow is the same, snow grain deposition on the surface of the bedincreases, and the snow retaining effect is much better; when the height of snow retaining wall is thesame, the snow width at leeward side gets bigger, and the distance between the railway line and the snowretaining wall should be larger. In consideration of the project cost and snow retaining effect, the height ofthe retaining wall should be between 2.5m and 3.5m, and the larger the height and the wind speed, thelarger the distance between the line and the snow retaining wall. The distance is normally set to be 20 mto 35m.