桥梁建设与河道行洪纳潮的适应性分析

以某特大桥为例,采用大范围一维网河数学模型与工程局部河道平面二维潮流数学模型相结合的方法,对该特大桥的行洪、纳潮影响进行了计算和分析.从大桥工程的轴线布置、梁底标高、墩台形式、桥跨组合、阻水程度、建设项目与堤防关系等方面论述了跨河桥梁建设与河道行洪、纳潮之间的适应性问题.为减少桥梁建设对河道行洪、纳潮的影响,从桥梁墩台布置等方面提出了指导性建议,使桥梁建设尽可能与河道行洪、纳潮能力相适应,也为水行政主管部门的行政许可提供参考.

Analysis of adaptability for bridge construction and river channel for coursing flood and tide

Taking a grand bridge engineering for example,the method of combination of one-dimensional river network mathematical model and local river 2-D tidal flow mathematical model is used to calculate and analyze the influence of the bridge on river coursing flood and tide.The problem of adaptability for bridge construction and river coursing flood and tide is discussed from layout of axis,elevation of beam at the bridge bottom,form of pier and cushion cap,combination of the bridge span,degree of water resistance,relation between the pier of the bridge and the dike,etc.Some general suggestions about the arrangement of the bridge pier and cushion cap are proposed to make the bridge construction to adapt the ability of the river flood and tide as far as possible;and the suggestions can be provided to the department of water administration as a reference for administrative licensing.