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跨河桥梁的防洪影响评价是水行政主管部门对桥梁建设审查的重点,需要专题论证。为研究跨河桥梁桥墩不同平面布局对河道防洪的影响差异,以河南省西平县小洪河河道上新建未来大道桥为例,通过平面二维水流数值模拟计算,论证了三组桥墩平面布局方案对河道行洪的影响。计算结果表明不同平面布局方案对河道沿程水位和流速的影响规律基本相同,其中,桥墩数量越多、密度越大,水位和流速的变化量值和变化范围越大;单个桥墩尺寸越大,单个或单排桥墩附近水位和流速有明显变化区域的范围越大。
Flood control impact assessment of bridges across the river is the water administrative department of the bridge construction review focus, the need for thematic demonstration. In order to study the different influence of bridge pier piers on river flood control, a case study of a new future bridge on Xiaohonghe riverbed in Xiping County, Henan Province is presented. The plane two-dimensional flow numerical simulation is used to demonstrate the plan of three pier piers layout. Impacts on flood discharge in rivers. The results show that the influence of different layout schemes on the water level and flow velocity along the course of the river is basically the same. The greater the number of piers, the larger the density is, and the larger the value and the variation range of water level and velocity are. The larger the size of single piers, Single or single row of piers near the water level and velocity significantly change the region the greater the range.