串列矩形桥墩对通航水流影响的二维数值模拟
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摘要
泸州河东长江大桥采用钻石形串排矩形柱型主塔,为了研究其主塔桥墩对该桥区河段各通航水流特性的影响,采用平面二维水流数学模型,模拟该河段方案实施前后的桥区河段流场,分析串列矩形柱桥墩对水流条件的影响。针对数模结果,从工程应用角度的分析表明在各级流量下工程实施前后桥区河段水位、流速变化较小,紊流宽度对通航条件影响较小,不会对桥区通航产生显著影响。
East Yangtze River Bridge of Luzhou takes the diamond-shaped rectangular column piers in tandem arrangement as its main tower. In order to study the influence of the main pylon pier on the flow characteristics of navigable river, it builds the 2D mathematical model of flow to simulate the flow field of the bridge area before and after the implementation of the plan, and analyzes the influence of the bridge pier on the flow condition. According to the results of the digifax, it finds that the water level and velocity change of the front and rear bridge are small at all levels of flow from the perspective of engineering application, and the width of turbulent flow has little influence on navigation conditions, and have no impact on navigation in bridge area.
East Yangtze River Bridge of Luzhou takes the diamond-shaped rectangular column piers in tandem arrangement as its main tower. In order to study the influence of the main pylon pier on the flow characteristics of navigable river, it builds the 2D mathematical model of flow to simulate the flow field of the bridge area before and after the implementation of the plan, and analyzes the influence of the bridge pier on the flow condition. According to the results of the digifax, it finds that the water level and velocity change of the front and rear bridge are small at all levels of flow from the perspective of engineering application, and the width of turbulent flow has little influence on navigation conditions, and have no impact on navigation in bridge area.
引文
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[2]杨忠超,陈明栋,杨胜发,等.鱼洞长江大桥桥墩对水流及通航的影响研究[J].人民长江,2009,40(22):63-66.
[3]严建科,焦臣,龙涛,等.单圆柱桥墩绕流流场试验研究[J].西安建筑科技大学学报(自然科学版),2012,44(6):779-785.
[4]李彬,孙东坡,赖冠文,等.桥墩布置形式对桥墩绕流及局部流场的影响[J].中国农村水利水电,2013(7):129-132,134.
[5]鲁婧,王向东,成晨,等.相同压缩比条件下单双排桥墩群流场分析[J].人民黄河,2013,35(1):115-116,119.
[6]国务院.长江经济带综合立体交通走廊规划(2014—2020年)[J].中国水运,2014(10):21-25.
[7]胡小庆,解中柱,刘勇,等.长江干线宜宾至重庆河段提升河段航道等级可行性研究成果[R].重庆:长江重庆航运工程勘察设计院,2014:27-35.
[8]林姗,陈明栋,陈明.桥墩紊流宽度研究综述[J].水利水运工程学报,2011(2):105-110.
[9]庄元.桥墩紊流宽度的试验研究[J].武汉理工大学学报(交通科学与工程版),2007,31(5):846-849.