近距多座并行桥梁墩前壅水研究

为了研究近距多座并行桥梁的壅水规律，在分析了单座桥梁的壅水规律后，类比应用到两座并行桥梁壅水的研究中且得到相应的规律，然后基于这些成果可达到研究目的。研究结果表明，如果被动影响桥梁位于主动影响桥梁的下游，则主动影响桥梁的壅水除了受自身阻水影响外，还要附加上被动影响桥梁的壅水对其带来的正影响作用；反之，则会受到被动影响桥梁的壅水对其带来的负影响，且影响系数都会随着两桥的桥间距增大而减小。假设并行桥梁的壅水仅仅两两影响时会形成修正壅水，且该修正壅水对其它桥梁产生重复的二次影响后会无限接近真实壅水。在这个前提下，总结出多桥并行时各桥壅水的经验公式。

Research on the effects of close multi-parallel bridge on flooding

To study the backwater extent law of close mulit-parallel bridges, the backwater extent rule of a single bridge will be firstly analyzed, and apply the rule to the research of two parallel bridges analogously, getting the corresponding laws, then the purpose can be achieved based on these results. The results show that if the passive influenced bridges are all at the downstream of the active influenced bridges, the backwater of the active influenced bridges will be influenced by both its own water resistance and the positive effects of the passive influenced bridges. On the contrary, it will be influenced by the negative effects of the passive influenced bridges, and the influence coefficient decreases with the growth of the spacing between each bridge. It can be assumed that there will be a calculative backwater when the backwater of parallel bridges is are influenced by each other, this backwater has a secondary influence on other bridges and then infinitely approach the real backwater. Based on this assumption, the empirical formula of each bridge backwater can be summarized when the multi- bridges are parallel.