折板跌落式竖井设计约束条件研究

结合国内深层隧道排水工程-广州市东濠涌深层排水隧道,通过物理模型试验探讨了不同折板间距情况下折板竖井消能规律,并根据竖井中水流在折板间需满足的过流能力及充分消能的约束条件,研究了折板竖井消能的最大过流流量及稳定消能边界,提出了折板竖井设计应同时满足的约束条件以及折板通气孔的推荐位置。研究表明,在折板间距与折板宽度的比值小于0.408时,约束条件只有最大过流能力;当比值大于0.408时,只需考虑充分消能的约束条件。

A study on design constraints for baffle-drop shaft structure

The physical model experiments have been carried out for the Guangzhou Donghaochong Deep Sewerage Tunnel which is a deep tunnel drainage project in China. The project adopts the baffle-drop struc-ture to convey the CSO (combined sewer overflow) into the tunnel. The energy dissipation for different baf-fle spacing has been explored. The maximum operational discharge and stable energy dissipation boundary are proposed as design constraints. The suitable location of inspection port is recommended. The study shows that when the ratio of baffle spacing to the baffle width is less than 0.408, the constraint condition is maximum operational discharge. Otherwise,the stable energy dissipation boundary is the only constraint.