围岩对地下主副厂房间振动传递的影响规律研究

Study on the law of vibration transmission in surrounding rock mass of underground main and auxiliary powerhouse

采用有限单元法,建立了某抽水蓄能电站地下主厂房与副厂房结构耦联体系的三维有限元模型,并进行了副厂房结构自振特性与共振复核的计算分析。通过改变主副厂房周边围岩位置与模拟范围,以副厂房楼板的动力响应为依据,探讨了振动在厂房周边围岩间传递的规律。结果表明:当围岩模拟范围增大时,副厂房的振动增大;厂房上下游两侧的围岩在振动传递过程中占据主导作用;厂房底部围岩可以传递振动,但在振动传递中起到的作用相对较小。研究结果为副厂房结构的抗振设计提供了有力依据。

A three-dimensional finite element model of the system of the underground main building and the auxiliary powerhouse structure of a pumped storage power station was established based on the finite element method.The self-vibration characteristics and resonance review of the auxiliary powerhouse was analyzed and calculated.By changing the position and simulation range of surrounding rock mass around the powerhouse,the law of vibration transmission between surrounding rocks of the powerhouse was discussed based on the dynamic response of the auxiliary powerhouse floor.The results show that when the simulation range of surrounding rock mass increases,the vibration of the auxiliary powerhouse will increase;the surrounding rock mass on the upstream and downstream sides of the powerhouse plays a leading role in the vibration transmission process;the surrounding rock on the bottom of the powerhouse can transmit vibration,but it has little effect on vibration transmission.The research conclusion provides valuable references for the vibration reduction design of the auxiliary powerhouse.