摘要
为了研究适应于青海雅丹地貌区沙漠铁路地质条件、气候环境等因素的新型固沙沙障,结合当地情况采用不破坏当地地貌环境的固沙砖作为固沙沙障。通过数值模拟软件Fluent,计算来流风速为26. 7 m/s工况下,对比分析固沙砖不同设计参数的阻沙固沙效果,确定固沙砖最优设计参数。结果表明:当固沙砖高度为40 cm、孔隙率为5%、铺设为1 m×1 m的规格时,可以充分利用涡旋作用,使大部分沙粒沉积在固沙区内;固沙区内部与上部的速度差可以达到27. 5 m/s,形成明显的速度梯度,亦有利于携沙风中沙粒沉降;固沙区内部风速降低最高幅度为93. 3%,近地表风速小于沙粒起动风速,有效遮蔽距离最大,有效遮蔽高度可达到0. 6 m。
In order to study the new type of sand barrier that adapts to the desert railway in the Yardanlandscape area of Qinghai Province, sand-fixing bricks are used as the sand barrier according to the localgeological conditions, climate and environmental factors in order not to destroy the local topography. Baseon the numerical simulation software Fluent, optimum design parameters of sand-fixing bricks subject tooncoming wind velocity of 26. 7 m/ s are determined by comparing sand-fixing results of different designparameters of sand-fixing bricks. The results show that when the height of sand-fixing brick, the porosityand the laying specification are set as 40 cm, 5% and 1 m × 1 m respectively, the vortex effect can befully utilized to deposit most of the sand particles in the sand-fixing area; the speed difference betweenthe interior and the upper space of the sand-fixing reaches 27. 5 m/ s, forming a significant velocitygradient, which will also be conducive to the depositing of sand particles in the wind; the maximum rangeof wind speed reduction within the sand-fixing area is 93. 3%; the near-surface wind speed is less thanthe sand-starting wind speed, the effective shielding distance is the largest, and the effective shieldingheight is up to 0. 6 m.
作者
王海龙
刘畅
孙婧
张治
李玉龙
WANG Hai-long;LIU Chang;SUN Jing;ZHANG Zhi;LI Yu-long(Department of Civil Engineering,Hebei University of Architecture,Zhangjiakou 075000,China)
出处
《铁道标准设计》
北大核心
2018年第11期59-64,共6页
Railway Standard Design
基金
青海省交通建设科技项目(2015-12)
河北省科技计划项目(15273814)
关键词
沙漠铁路
固沙沙障
数值计算
设计参数
涡旋作用
Desert railway
Sand barrier
Numerical calculation
Design parameters
Vortex effect
