核电厂泵房直立墙振动台模型试验研究

Shaking table model test on upright wall of nuclear power plant′s pumping station

开展了某核电厂泵房直立墙结构振动台模型试验,采用粒子图像测试技术(PIV技术)测量了直立墙和墙后块石的变形过程,详细分析了直立墙结构在地震作用下的地震响应和破坏模式.研究表明位于抛石基床上的直立墙结构变形过程为当输入加速度较小时,直立墙处于稳定状态;随着输入加速度逐渐增大,直立墙在自身地震惯性力和墙后回填块石的动土压力作用下缓慢向外海侧水平滑移、倾斜和竖向沉降,墙后回填块石出现沉陷,但变形较小;当加速度达到一定值时,直立墙向外海侧移动和回填块石沉陷速率急剧增加,变形较大.

Shaking table model test on upright wall of nuclear power plant′s pumping station is designed according to a real project .The deformation process of upright wall and gravel behind wall during earthquake is measured by the particle image velocimetry （PIV ） method .Earthquake response and failure mode of upright wall structure under earthquakes are analyzed in detail .The test results show that the failure process of upright wall structure located on rubble foundation is as follows ：when the input acceleration is smaller ,upright wall is in a steady state ;with the gradually increase of input acceleration ,upright wall starts to horizontally slip ,incline and vertically settle ,and backfill gravel appears to subside under the action of seismic inertia force and dynamic earth pressures ,but the displacement is small ;when the acceleration reaches a certain value ,movement speed of upright wall and subsidence rate of backfill gravel increase dramatically and upright wall structure displaces significant deformation .