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为了解桥梁工程跨堤布置对两岸防洪堤及河道防洪的影响,基于概化的数值渠道,采用MIKE21二维水流数学模型,分别从桥墩近堤距离、桥墩轴线布置及桥墩墩型设计三方面设定不同的河道参数及墩堤布置情况,模拟分析了近堤水流流速和墩堤间局部流场变化情况,揭示了不同情形下近堤流速及流场变化的规律,研究了其对河道防洪的影响。结果表明,桥梁跨堤、桥墩近岸布置时,增大近堤距离、减小桥墩轴线与河道岸线夹角和采用单一矩形壁式墩型均可减小对河道岸坡稳定及防洪安全的不利影响。
In order to understand the influence of the cross-embankment of the bridge project on the flood control banks and the flood control in the two banks, based on the generalized numerical channel, MIKE21 two-dimensional flow mathematical model is set up from three aspects: the distance between bridge pier and embankment, According to the different channel parameters and dyke arrangement, the change of the flow field and the local flow field between the embankment are simulated and analyzed. The law of flow velocity and flow field near the dike is revealed under different conditions. influences. The results show that when the bridge is arranged along the banks of the embankment and abutment, the distance to the embankment is increased, and the angle between the pier axis and the shoreline of the river channel is reduced and the single rectangular wall pier type can reduce the stability of the bank slope and the flood control safety Negative Effects.