沙漠腹地高速公路输沙沟设计及气流场分析  

Design of Sand Conveying Ditch and Analysis of Air Flow Field for Expressway in Desert Hinterland

作　　者：贾小龙 罗延赤 丁新建 余国根 孙跃轩 JIA Xiaolong;LUO Yanchi;DING Xinjian;YU Guogeng;SUN Yuexuan

机构地区：[1]宁夏交通建设股份有限公司,宁夏银川750002 [2]宁夏交建交通科技研究院有限公司,宁夏银川750000 [3]宁夏公路管理中心,宁夏银川750002

出　　处：《城市道桥与防洪》2023年第6期41-44,M0007,共5页Urban Roads Bridges & Flood Control

基　　金：宁夏回族自治区科学技术厅重点研发计划项目(2121BEG02017-02);宁夏回族自治区交通运输厅科技项目(202000174)。

摘　　要：为避免沙漠公路产生沙害问题,依托乌玛沙漠高速公路防沙治沙工程,围绕“输沙断面”的输沙理念,基于风沙运动原理和流体力学(CFD)数字模拟原理,开展输沙构筑物位置及尺寸对路基气流场特征和积沙特征的影响分析。研究结果表明,当输沙构筑物距路基为5m时,路基整体受风蚀影响最小,且坡脚和路面积沙量最少。当输沙构筑物距路基为3m时,路基背风侧积沙量最小。当输沙构筑物宽度为9m时,路基坡脚与坡面所受风蚀作用最小。当输沙构筑物宽度为6m时,行车道所受风蚀作用最小。同时,当输沙构筑物等级为3级、宽度为9m时,能有效缓解输沙沟内输沙压力及风力堤处沙粒堆积,但输沙构筑物宽度对路基积沙量影响较小。总的来说,在实际工程中可根据不同地形、不同需求,因地制宜地设定输沙构筑物参数进行防沙治理。In order to avoid the problem of sand damage on desert highways,relying on the Uma Desert Expressway Sand Prevention and Control Project,around the sand conveying concept of"sand conveying section",based on the principle of wind and sand movement and the principle of computational fluid dynamics(CFD)digital simulation,the influence of the location and size of sand conveying structure on the characteristics of subgrade airflow field and sand accumulation is analyzed.The research results show that when the sand conveying structure is 5 m away from the subgrade,the overall subgrade is least affected by wind erosion,and the amount of sand at the toe of the slope and the pavement is minimum.When the sand conveying structure is 3m away from the subgrade,the leeward side of subgrade has the least sand accumulation.When the width of the sand conveying structure is 9 m,the wind erosion of the subgrade toe and the slope surface is the smallest.When the width of the sand conveying structure is 6 m,the wind erosion of the roadway is the least.At the same time,when the sand conveying structure is grade 3 and the width is 9 m,the sand conveying pressure in the sand conveying ditch and the accumulation of sand particles at the wind dike can be effectively alleviated,but the width of the sand conveying structure has little effect on the sand accumulation of the subgrade.In general,based on the different terrains and different needs,the parameters of sand conveying structures can be set according to local conditions for sand prevention and control in practical projects.

关 键 词：防沙治沙 输沙 构造物 设计 

分 类 号：U416.16[交通运输工程—道路与铁道工程]