Abstract: The underground powerhouse of Taishan pumped storage power station is highly influenced by upstream reservoir level, especially the seepage water's softening effect on fault and joint fracture. It causes some potential safety problems for powerhouse operation. To solve the problems, based on strength reduction method, this paper uses finite difference calculation method to analyze the safety and stability of underground powerhouse of Taishan pumped storage power station and explores weakening fault's effect on the cavern stability during and after excavation. The result reveals the stability law of the underground powerhouse and provides scientific references for its safe operation based on the analysis of strength reduction method.

Key words: stability of surrounding rock, strength reduction method, plastic zone, fault

摘要： 泰安抽水蓄能电站地下主厂房受上游水库影响较大，尤其是渗流水对断层、节理裂隙等弱性岩层有弱化作用，对厂房的安全运营等造成了一定的安全隐患。针对以上问题，基于强度折减法，分析影响主厂房安全稳定的断层、节理裂隙等弱性岩层强度参数弱化后，泰山抽水蓄能电站主厂房的稳定性规律，为电站安全运营提供参考依据。

关键词: 围岩稳定, 强度折减法, 塑性区, 断层