兰新铁路强风地区风沙成因及挡风墙防风效果分析  

Analyses of the Causes for Wind Disaster in Strong Wind Area along Lanzhou-Xinjiang Railway and the Effect of Windbreak

作　　者：葛盛昌 蒋富强 

机构地区：[1]乌鲁木齐铁路局,乌鲁木齐830011 [2]中铁西北科学研究院有限公司,兰州730000

出　　处：《铁道工程学报》2009年第5期1-4,共4页Journal of Railway Engineering Society

基　　金：科技部科研院所专项资金项目(NCSTE-2007-JKZX-209)

摘　　要：研究目的:通过对兰新铁路"百里风区"和南疆铁路前百公里强风地区风沙成因进行分析,研究挡风墙后不同高度、不同间距风速变化情况,现场实测挡风墙的"遮蔽效应",对挡风墙的防风效果进行评价。研究结论:兰新铁路强风地区风区大风主要为内陆寒潮性大风,受地形地貌引起的狭管效应、下坡风及局地大气对流效应的影响较大,具有风速高、风期长、季节性强、风向稳定、起风速度快等特点。现场实测表明,挡风墙防风效果显著,3 m高挡风墙后在3 m高内风速较挡风墙外侧风速大大降低,风速20 m/s时有效遮蔽范围超过38 m,有效地减弱了列车的倾覆力矩。不同条件下挡风墙对沙害减弱的影响还需进一步加深研究,这些结论对于今后铁路防风沙具有一定的指导和借鉴作用。Research purposes： This paper analyzes the causes for the wind disasters in 100 - kilometer wind area along the Lanzhou - Xinjiang Railway and the front 100 - kilometer wind area along the Nanjiang Railway, studies the changes of wind speed after the wind break with the different heights and different interval space, and evaluates the effect of windbreak based on the measurement of shielding effect of the windbreak. Research conclusions：The strong wind in the strong wind area inland cold wind with the characteristics of high wind speed, long along Lanzhou- Xinjiang Railway mainly belongs to wind season, stable wind direction and quick winding due to the narrow tube effect, downhill wind and large convection current of atmosphere caused by the topography. The field measurement shows that the effect of windbreak is significant, namely the speed of the wind behind the 3 m high windbreak is much lower than that outside the windbreak and the shielding scope of windbreak exceeds 38m when wind speed is 20m/s, which effectively weakens the train overturning moment. However, it is necessary to do the further research on the effect of windbreak on reducing the wind disaster under different conditions and the conclusions offered in this paper can provide references to control sandstorm along railway in the future.

关 键 词：兰新铁路 挡风墙 百里风区 效果 

分 类 号：P425[天文地球—大气科学及气象学]