(一)前言(略)(二)平均动水作用力平板闸门是应用最广泛的高水头闸门,既可用在隧洞进口上游面,也可用在闸井或闸室。在操作时,沿闸板底面上的压力因射流的高流速而降低。作用在闸门上的压差就产生一个向下的力,通常称为下曳力。因该力十分可观,在设计中需要对该力的值进行预估。目前已有预估的方法,其可靠性已为模型试验研究多次证实。 (A) Foreword (omitted) (b) The average hydrodynamic force Plate gate is the most widely used high head gate, both upstream and downstream of the tunnel entrance can also be used in the gate or sluice gate. In operation, the pressure along the underside of the shutter is reduced by the high flow rate of the jet. The pressure differential acting on the gate creates a downward force, commonly referred to as drag. Because of this force is very considerable, in the design needs to estimate the value of the force. At present, there is a prediction method, and its reliability has been confirmed many times by model test research.