摘要
为准确评估山区复杂工况条件下斜交桥梁对河流行洪的影响,建立MIKE21FM水动力模型,以拟建浮渡河大桥为例,分析不同频率设计洪水条件下斜交桥梁对河流水位及流速的影响。结果表明,急流条件下桥梁对河道水位壅高的影响较缓流条件下要大,并且随着斜交角度的增加而增加,在桥梁设计过程中应尽量保持桥梁轴线与水流方向正交,以减小桥墩对河道行洪的影响;拟建浮渡河大桥能够使河道水位壅高,桥下流速越大,并且随着洪峰流量的增大,水位壅高和流速增加越明显;受水流流态及斜交角度的影响,杨家沟铁路桥处水位壅高及流速增加均大于下游陈屯铁路桥;斜交桥梁对山区河流行洪影响需要引起重视。
To better evaluate the influence of skew bridge on flood-control under complex conditions,the MIKE21 FM hydrodynamic model was established to analyze the influence of proposed Fudu River bridges on water level and flow velocity under the flood of different frequency.The results show that the backwater height in rapid flow condition is higher than that in slow flow condition and backwater height increases with the bigger skew angle.In the bridge design,it is recommended that the bridge axis should better be orthogonal to the direction of water flow,which could reduce the influence of piers on the river flood-control.The proposed skew bridge can make water level rise in front of the pier and the flow velocity increases under the bridge.The backwater height and the flow velocity increase as the flood increases.Due to the flow state and the skew angle,increase of backwater height and flow velocity at Yangjiagou Bridge both are greater than those at Chentun Bridge.Influence of skew bridge on flood-control should be fully considered in mountain bridge design.
作者
秦国帅
许士国
李文生
刘瑀
QIN Guoshuai;XU Shiguo;LI Wensheng;LIU Yu(Dalian University of Technology,Dalian,Liaoning 116024,China;Dalian Water Conservancy Building Design Institute,Dalian,Liaoning 116021,China)
出处
《水利与建筑工程学报》
2018年第4期6-10,30,共6页
Journal of Water Resources and Architectural Engineering
基金
国家重点研发计划项目(2016YFC0400903)
中央高校基本科研业务费资助项目(DUT17JC17)
作者简介
秦国帅（1991-），男，河南安阳人，博士研究生，研究方向为水文学及水资源。E-mail：qgs1991@mail．dlut．edu．cn;通讯作者：许士国（1958-），男，山东临沂人，教授，主要从事水资源与水环境方面的研究。E-mail：sgxu@dlut．edu．cn
