大型抽水蓄能电站场地地震动效应及设计地震动参数研究

Study of Seismic Effects and Seismic Dynamic Parameters of a Large Pumped Storage Power Station Site

大型抽水蓄能电站往往建于山区的沟源坳地,场地地形复杂,各工程场点高差大。结合某大型抽水蓄能电站工程的具体情况,根据工程场地岩土参数原位测试及试验室试验结果,采用二维波动有限元方法研究复杂场地条件下的场地地震动效应,计算确定了50年及100年设计基准期对应超越概率63%、10%、5%、2%共8个设防水准的地震动参数,并通过不同高程处地震动参数的对比分析,研究了地形地貌对场地地震动效应的影响,得到一些有价值的结论。研究成果已在具体工程设计中采用,该成果对其它同类工程也有一定借鉴作用。

Large pumped storage power stations are usually located in mountainous areas with remarkable relieves and complex landforms and geological settings. In this paper, a case study is conducted of a large pumped storage power station, which is one of national key projects. Based on rock mass parameter measurements in the field and in laboratory, numerical analysis is carried out to study the seismic effects of the complex site of the station by using two dimensional dynamic finite element method. According to antiseismic protection requirements of this project, seismic response analysis of 8 seismic levels has been performed with exceedance probabilities of 63,10 and 3 percent in 50 years and 100 years respectively, and the analytical results indicate that the seismic effects vary remarkably with different sections of the site. The design seismic dynamic parameters of 8 anti-seismic protection levels are suggested for application to this project, which can be also used as a reference for other similar projects.