对三峡水利枢纽工程导流底孔闸门动力安全监测资料作了介绍与分析,其中包括闸门的动力特性和在设计水位条件下闸门在动水启闭过程中的振动加速度、振动位移、动静应力、脉动压力和启闭力的监测成果。监测成果表明闸门的自振频率监测成果与闸门水弹性模型试验成果很接近,振型相同;在动水开门和关门过程中,闸门在小开度时,下游面底缘的脉动压力较大;闸门门叶和支臂的振动小开度比大开度的大,未出现危害性振动,各测点的振动位移和振动应力都比较小,闸门振动是安全的。

The prototype dynamic safety monitoring data of the bottom outlet gate of three gorges project (TGP) is analyzed. The monitoring data include gate’s dynamic property and vibrating acceleration,dynamic displacement, dynamic and static stress, fluctuating pressure, and hoisting capacity under designed water level. The prototype monitoring results show that the natural frequencies of the gate are approximate to the test results of hydroelastic model, and the modal shapes of the gate are the same with those in the hydroelastic model. When the gate is in opening or closing condition with small angles, the fluctuating pressure on the bottom of the gate’s downstream face is bigger, and the acceleration at the bottom of the gate is larger, but the corresponding dynamic displacement and dynamic stress are very small. Moreover, the vibration of gate leaf and support arms under small-opening condition is larger than that under large-opening condition, but with no harmful vibration in the whole process. In conclusion, the flow-induced vibration of the gate is safe.