Research on Vibration Characteristics of an Underground Powerhouse of Large Pumped-Storage Power Station

With the rapid development of pumped storage, vibration problems caused by operation power stations have become increasingly prominent. In this paper, a large-scale pumped-storage station is taken as research object, and three-dimensional refined finite element model underground powerhouse including surrounding rock mass established. Based on analysis source water diversion pipeline, modal dynamic response hydropower carried out, distribution law larger displacement position revealed. The calculation results show that under premise selected reasonably numerical accurate, main frequency structure can be obtained more accurately. After optimizing design based results, resonance problem avoided. elastic modulus around has little influence mode shape powerhouse, but great its fundamental frequency. When increases 50%, plant about 29%. At same time, each order does not change much, mainly manifested beam system structure, which stiffness components being much smaller than structural windshield, machine pier, concrete volute. provide references for powerhouses problems.