管涵漫水桥壅水计算方法研究

Study on backwater calculation method of overflow bridge of pipe culvert

为了研究管涵漫水桥的壅水计算问题,构造了针对梯形河道断面的顺直河流模型,并根据实际管涵漫水桥的设计指标构造管涵漫水桥河流模型。在此基础上,应用公式法、HEC-RAS软件分别对单线桥梁壅水、双线桥梁叠加壅水等情况进行了计算、分析与讨论。结果表明:①两种方法均可用于管涵漫水桥壅水计算,而且二者的计算精度相当;②使用公式法时需要依据桥梁和河道断面形式合理选用堰流量公式,HEC-RAS软件中的主要参数堰流量系数C0可用公式法得到;③在实际工程中两种方法配合使用,可使壅水计算结果更加合理。

In order to study the backwater calculation of an overflow bridge of pipe culvert,a straight river model of trapezoidal river section was constructed,and an overflow bridge of pipe culvert model was constructed according to the design index of actual engineering parameters.On this basis,a formula method and HEC-RAS software were used to calculate,analyze and discuss the single-line bridge backwater results and the double-line bridge superimposed backwater.The results showed that:①Both methods can be used to calculate the backwater of the pipe culvert overflow bridge,and the calculation accuracy of the two methods was equivalent.②When using the formula method to calculate,it is necessary to reasonably select the weir flow formula according to the bridge and river section forms,and the main parameter weir flow coefficient C 0 in HEC-RAS software can be obtained by the formula method.③In practical engineering,the combination of the two methods can make the calculation results of backwater more reasonable.