邵水河W形河湾多线桥壅水模型试验研究

Model Test Study of Backwater under Multiple-Track Bridge in W-Shaped River Bend of Shaoshui River

结合邵水河某铁路多线桥壅水模型试验,对W形河湾的水流流态、流速分布、桥前壅水等情况进行了分析。结果表明:①在W形河湾上建设多线桥,且当桥位位于第一个湾顶附近时,新建桥梁对上游直河段有一定阻水作用;②在W形河湾湾顶附近的新建桥梁桥位后河湾段的壅水情况与桥前情况不同,且河湾段左右岸壅水值的变化并不一致;③在W形河湾上建设多线桥,桥梁壅水情况比较复杂,其壅水范围、最大壅水高度与河道防汛、城市防洪安全以及规划堤防的建设等密切相关,需要慎重考虑。

Combined with the experiment of Shaoshui River railway line bridge dammed water model, the W-shaped bend flow, velocity distribution, bridge backwater condition were analyzed. The results show that ： （1）A New bridge has a certain water resistance effect on the upstream straight river, when building a multi-track bridge on the W-shaped bend and the bridge is located near the top of the first bay. （2）The situation of backwater in front of bridge is different from the behind when building a new bridge near the top of W-shaped bend ; it is not consistent of backwater range- ability for the section of the left and right. （3）The situation of backwater under the bridge is complicated when building a new bridge near the top of W-shaped bend. Because the backwater scope and maximum backwater height are closely related to the river flood control, city flood control safety and the planning of city dike construction, these need to be carefully considered in planning.