Study on flow-deflector of cross bridge pier and field test in large transmission channel
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Abstract:
In order to solve the engineering problem that the high water level in the intensive section of the cross-channel bridge affected the water transport capacity of the project during the period when the operating flow of the Middle Route of the South-to-North Water Transfers Project exceeded the maximum designed flow for the first time in 2020, the 13.233 km section from Shuangji River inverted siphon to Mei River inverted siphon was selected as the test section, and five typical bridges of the test section were selected as the test objects. The numerical simulation and prototype observation test research methods were used to design and study the application effect of the bridge pier guide dome. The basic type of the guide dome was designed according to the hydraulic theory. The 3D hydrodynamic model parameters were calibrated using the prototype observation data of the unguided dome. Meanwhile, the schemes of different guide dome sizes were further compared and selected by numerical simulation, and the optimal scheme was obtained. Through the prototype test, the optimization of the flow pattern and the improvement of the water transport capacity of the test section of five bridges after installation of the guide domes were analyzed and verified.The results showed that after the installation of the guide dome, the flow pattern near the pier of the five bridges was obviously improved, the head loss of the test section was reduced by around 64.4%, the comprehensive roughness was reduced by around 8.0%, and the flow capacity of the test section was increased by around 8.71%, which further verified the reliability of the numerical simulation.The method of bridge pier guide dome design and prototype observation can also be effectively applied to other similar long-distance open channel water transmission projects.
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