Failure analysis of a leaf gate jammed in closing process

摘要

The incomplete closure of a leaf gate frequently occurs in recent years, while the failure analysis and feasible solutions have not been reported in many previous works. In this paper, failure analysis of a leaf gate jammed under submerged discharge is performed using an equilibrium equation to study the horizontal and vertical forces in the closing process. The results of the model test and numerical simulation show that the excessive friction coefficient is the main reason for leaf gate jammed. On the premise of the leaf gate configuration certainty, the permissible friction coefficient can be obtained by the water head difference. Changing the key beam position and decreasing the gate lip angle have no effect on closing. Adding the area of the water column such as widening the gate and adding a convex bottom edge are feasible solutions to solve the problem of gate jammed. The results also yield a simplified forecasting formula of pressure head ratio, which provides a reference for the solution of similar problems and the design of a new leaf gate.