渠江风洞子航运工程施工导流优化方案设计

Construction diversion optimization scheme of Qujiang Fengdongzi navigation project

针对渠江风洞子航运工程施工导流方案中二期导流时段过流断面流速大,下游河道抗冲刷能力不足、上游围堰堤头头部冲刷显著等问题,在施工导流物理模型试验研究的基础上进行施工导流设计方案优化研究。采用优化施工导流平面布置、加强下游消力池抗冲设施设计,优化全年纵向围堰堤头结构形式、枯期纵向围堰长度等方案,结合枢纽总布置、施工工期、施工强度、工程投资等因素,并对优化后的施工导流模型进行试验验证,提出满足施工要求的导流设计方案,用于指导工程施工。

In the construction diversion scheme of the Qujiang Fengdongzi navigation project, the flow velocity at the flow section is large during the phase II diversion period. Meanwhile, the anti-scour ability of the downstream river channel is insufficient, and the scour at the head of the upstream cofferdam is significant. In response to these problems, this paper optimizes the construction diversion design scheme on the basis of the physical model test of construction diversion. The paper takes measures of improving the construction diversion plane layout, strengthening the design of the anti-impact facilities of the downstream stilling pool, and optimizing the structural form of the head of the longitudinal cofferdam throughout the year and the length of the longitudinal cofferdam in the dry season, taking into account the general layout of the hub, construction period, construction intensity, project investment, and other factors. It also tests and verifies the optimized construction diversion model and puts forward the diversion design scheme meeting construction requirements for guiding project construction.