沙漠公路高立式大网格沙障防护效益分析  

Analysis on Protection Benefit of High Vertical Large Grid Sand Barrier in Desert Highway

作　　者：张伟 李琦 季帅 ZHANG Wei;LI Qi;JI Shuai(CCCC Rail Transit Business Division,Beijing 101300,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]中国交建轨道交通事业部,北京101300 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《路基工程》2024年第6期42-48,共7页Subgrade Engineering

基　　金：宁夏交通运输厅科技项目:基于生态理念的沙漠腹地高速公路综合设计研究(20200173)。

摘　　要：基于乌玛高速公路沙漠段防护体系,构建Fluent欧拉双流体高立式大网格沙障模型,分析不同组别高立式大网格沙障下的风沙流场,研究其防风效率及有效防护距离。结果表明:高立式大网格沙障迎风侧气流速度快速下降,背风侧后开始恢复,整体速度成“V”形分布,双组风速降低率均大于100%,利于积沙的同时产生回流效应;积沙形态呈直角三角形分布,双组下积沙范围更广,沙障后无明显积沙,最大程度地阻滞了近地表的风沙流;双组防护效率为单组的1.07倍,双组防护距离为单组的1.33倍,大网格沙障的防护效益不仅表现在阻沙效益,在一定程度上也存在固沙效益。Based on the protection system of the desert section of Wuma Expressway,the Fluent Euler two-fluid high vertical large-grid sand barrier model was constructed to analyze the wind-sand flow field under different groups of high vertical large-grid sand barriers,and its wind-proof efficiency and effective protection distance were studied.The result shows that,the airflow velocity on the windward side of the high vertical large-grid sand barrier decreases rapidly,and begins to recover at the leeward side.The overall velocity is in a'V'shape distribution,and the wind speed reduction rate of the double group is greater than 100%,which is conducive to the accumulation of sand and the backflow effect.The shape of sand accumulation is a right-angle triangle distribution.The sand accumulation range of the double group is wider,and there is no obvious sand accumulation after the sand barrier,which blocks the near-surface wind-sand flow to the greatest extent.The protection efficiency of the double group is 1.07 times that of the single group,and the protection distance of the double group is 1.33 times that of the single group.The protection benefit of the large-grid sand barrier is not only reflected in the sand blocking benefit,but also in the sand fixing benefit to a certain extent.

关 键 词：沙漠公路 大网格沙障 风沙流 防风效率 防护效益 

分 类 号：U417.1[交通运输工程—道路与铁道工程]