交通风对不同结构城市地下道路污染物扩散影响的比较研究  

Comparative research on pollutant dispersion based on traffic force in urban straight tunnel and bifurcation tunnel

作　　者：李琼 陈超[1] 许淑惠 袁浩庭 LI Qiong;CHEN Chao;XU Shuhui;YUAN Haoting(College of Architecture and Civil Engineering,North China Institute of Science and Technology,Sanhe Hebei 065201;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124;School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044)

机构地区：[1]华北科技学院建筑工程学院,河北三河065201 [2]北京工业大学建筑工程学院,北京100124 [3]北京建筑大学环境与能源工程学院,北京100044

出　　处：《环境污染与防治》2018年第11期1214-1218,1223,共6页Environmental Pollution & Control

基　　金：北京市自然科学基金资助项目(No.8162006);国家自然科学基金资助项目(No.51378024);中央高校基本科研业务费资助项目(No.3142017068);北京市重点实验室研究基金资助项目(No.NR2015K06)

摘　　要：以往关于交通通风力的研究多集中在直隧道,而关于近年多出现的有分岔的城市地下道路的研究甚少。根据项目组关于上海市翔殷路越江隧道(直隧道)和长沙市营盘路湘江隧道(分岔隧道)的交通特征、交通风速以及污染物浓度水平的实测结果,重点开展了交通通风力对不同结构城市地下道路污染物扩散特性影响的比较研究。结果表明:相同交通流量条件下,有分岔的主隧道产生的平均交通风速(2.24～3.44m/s)虽小于直隧道的(3.06～4.76m/s),但由于分岔匝道对污染物的分流作用,有分岔的主隧道的污染物浓度变化率低于直隧道;当平均车速为30km/h时,受合流匝道带入室外空气稀释作用的影响,相当于为分岔隧道增加了20.9%的通风量,受分流匝道带出污染物的影响,相当于为分岔隧道增加了16.7%的通风量。研究结果可为分岔城市地下道路内污染物浓度水平的有效控制及其通风系统的优化设计提供参考。Previous studies are mainly focused on traffic force in straight tunnel,but little in bifurcation tunnel which often appears in recent years.The traffic characteristics,air velocity and the carbon monoxide（CO）,nitrogen oxides（NOx）concentrations were measured by our project team in Shanghai Xiangyin Road Tunnel（straight tunnel）and Changsha Yingpan Road Tunnel（bifurcation tunnel）.The research was focused on the variation of pollutant dispersion with traffic force in those two different structure tunnels.Measurement results showed that the average air velocity（2.24-3.44 m/s）in bifurcation tunnel was less than in straight tunnel（3.06-4.76 m/s）under the same traffic flow.The change rate of pollutant concentrations in bifurcation tunnel were less than in straight tunnel because of the distribution of pollutants throughout the distributary ramp.When the average vehicle speed was 30 km/h,the air flow came from the confluence ramp could dilute pollutant concentration levels in the main tunnel of bifurcation tunnel,which was equivalent an increase of 20.9%for the tunnel＇s ventilation.Similarly,the distributary ramp could split out pollutants from the main tunnel of bifurcation tunnel,which was equivalent an increase of 16.7% for the tunnel＇s ventilation.The result could provide a quantitative assessment method to support pollutant concentration control and optimal the ventilation design in bifurcation tunnel.

关 键 词：分岔城市地下道路 污染物浓度分布 现场实测 交通通风力 需风量 

分 类 号：X51[环境科学与工程—环境工程] U453.5[建筑科学—桥梁与隧道工程]