阿联酋铁路路基风沙防治措施数值分析及设计

结合阿联酋联合铁路工程背景,采用CFD技术对风沙防治措施进行模拟分析,并根据计算结果进行风沙防治措施设计,使设计更趋于合理化。基于阿联酋风沙实际情况,分别利用GAMBIT软件和ANSYS软件建立路基整体风洞模型和阻沙栅栏二维模型,并用FLUENT软件进行求解,根据对比分析选取适宜的路基边坡坡率、地表覆盖物粒径、阻沙栅栏疏透率等设计参数,进行风沙防治措施设计。结论:(1)风沙路基应采用放缓路基边坡坡率的措施,路堤边坡坡率以1∶2~1∶5为宜;(2)路基两侧应平铺砾石土覆盖于沙地表面,粒径不宜小于5 cm;(3)阻沙栅栏高度宜采用1.5m,按疏透度0.4采取适宜的布置形式。

Numerical Analysis and Design of the UAE Railway Subgrade Sand Preventive Measures

The sand prevention measures,simulated with CFD technology in view of UAE railway engineering background,are calculated and designed to be more realistic. The wind tunnel model and sand fence two-dimensional model are established with GAMBIT and ANSYS software based on the actual situations in UAE. Based on the comparative analysis to select appropriate design parameters,such as particle size of surface coverage,subgrade slope rate,and resistance rate of sand fence,prevention measures are designed. It is concluded that(1) the measures to slow down subgrade slope rate should beadopted,and the suitable slope rate is around 1∶ 2 to 1∶ 5;(2) the surface on both sides of subgrade should be covered with sand gravel soil,and the particle size should not be less than 5 cm;(3) the height of sand fence should be 1. 5 m with appropriate arrangement according to the resistance rate of 0. 4.