深筒式消能井的冲击压力和管口距研究

Experimental Study on the Impact Pressure of Vertical Stilling Well

通过某工程深筒式消能井的物理模型试验,确定了其井底部冲击压力与流量、管口距及管口直径的相关性及经验公式;该工程推荐的管口距为1.5 m,消能井总深度维持在10 m以内。试验还表明,冲击压力随流量增加而增大,随管口距增大而减小;筒式消能井的适用范围可适当扩大;基础为土基的消能井深度不宜太大,基础条件较好时管口距可适当加大。

Physical model of the vertical stilling well in a project is constructed and experimental study is carried out to determine the relationships between the impact pressure on the bottom plate of the stilling well and other parameters such as the discharge flow,the distance between the pile orifice and the bottom plate,and the pipe diameter.Empirical equations are also obtained.The recommended distance between the pipe orifice and the bottom plate is 1.5 m while the total depth of the stilling well is maintained within 10 m.It also shows that the impact pressure increases with the increase of the flow and decreases with the increase of the orifice-bottom distance.The application scope of the stilling well can be appropriately expanded.The depth of the stilling well in soil foundation should not be too large.When the foundation condition is good,the orifice-bottom distance can be increased properly.