关键词: 龙羊峡拱坝, 断层, 渗流特性, 研究

Abstract: The ultra-deep strong pervious penetrating fault F120 and dyke A2 (hereinafter referred to as the F120+A2 fault) at dam foundation of Longyangxia hydropower station extend to the foundation bottom for several kilometers, penetrating upstream to downstream of the dam. In order to study the seepage characteristics of the rock mass at the F120+A2 fault during long-time operation with normal water level or high water level and evaluate its influence on dam safety, by use of prototype monitoring data and theoretical analysis method, creep analysis model and numerical simulation method are established. The result showed that the seepage and deformation at the F120+A2 fault is normal and it has not exerted any abnormal influence on dam performance. For the current working state of F120+A2 fault, no rehabilitation is needed.

Key words: Longyangxia arch dam, fault, seepage characteristics, research