深层隧道排水系统中矩形折板竖井水力特性试验研究

Experimental study on hydraulic characteristics of rectangular baffle drop shaft in deep tunnel drainage system

为研究新型矩形折板竖井的水力特性,通过物理模型试验分析了矩形截面折板竖井内的水流流态及消能特性,提出了改善竖井水流流态的整治措施,并与圆形截面竖井进行了对比。研究结果表明:矩形折板竖井存在左右摆动的水流流态,经过增设整流板可有效抑制折板上的摆动水流,并通过调整通气孔位置,保障了通气孔的畅通;矩形截面竖井消能率在91.8%~94.5%之间,具有单宽流量大、开挖面积小等优点,但竖井内的摆动流态需特别关注。

In order to study the hydraulic characteristics of the rectangular baffle drop shaft,a physical model experiment were carried out for investigating the flow pattern,energy dissipation of the rectangular baffle drop shaft,and based on this improvement measurements were proposed to improve the flow pattern in the drop shaft.The rectangular baffle-drop shaft was compared with the circular baffle-drop shaft.The research result showed that there was swing flow pattern in the drop shaft.The swing flow pattern can be efficiently suppressed by setting up rectifying plate.After adjusting the venting position,the ventilation can be ensured properly.The energy dissipation rate of the rectangular drop shaft was between 91.8%and 94.5%,with advantages of high unit discharge and small overcurrent width.But the swing flow pattern in the shaft still required special attention.