Abstract
Generally, the operation of the horizontally-framed miter gate in a ship lock should consider the effects of hydrodynamic resistance. If over-filling or over-emptying exists and the miter gate opens with reverse head, the hydrodynamic resistance will increase rapidly, endangering the operation safety of the miter gate. In order to study the operating characteristics of the miter gate, a prototype test is introduced in this paper. Results show that, during the filling or emptying process, when water levels at both sides of the miter gate are equal the first time, opening the gate in a timely manner can obviously avoid the influence of reverse head. Furthermore, a three-dimensional numerical model with a dynamic mesh is established for analyzing the hydrodynamic characteristics in different operating conditions. Results show that the peak value of operating load always occurs at the initial time, and the greater the submerged water depth, the larger the peak value. With the increasing of reverse head, the piston rods sustain a great compression, and the peak value appears at an early stage of gate opening. The results have a reference value for the design of a miter gate in the related engineering projects.
Highlights
The horizontally-framed miter gate is widely used for ship lock control devices in hydraulic engineering
The results show that the peak of the hydrodynamic resistance moment occurred at the initial time, and the greater the submerged depth, the larger the peak values
The results show that the maximum hydrodynamic resistance moment was −1.05 × 103 kN·m when the miter gate opened with the same water level at both sides of the miter gate
Summary
The horizontally-framed miter gate is widely used for ship lock control devices in hydraulic engineering. With the rapid development of navigation in China, the applicable condition, operation mode and structural stress of the lock gate have attracted more and more public attention. In recent years, a series of super-high-head ship locks in complex operating conditions has been built in the southwest of China. The research on miter gates mainly contributes to the structure stress or fatigue [1,2,3,4,5,6]. Ming [1] made a theoretical analysis of a miter-type lock gate structure subjected to hydrostatic pressure and found that the failure modes were decisively dependent on the mitered angle
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