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

摘要： 龙羊峡水电站右岸坝基超深强透水贯穿性F120断层和A2岩脉（以下简称F120+A2断层）延伸至基础底部深达数公里，贯穿坝体的上下游，透水性强。为了研究库水位达到正常蓄水位或高水位作用时间较长时，F120+A2断层部位岩体渗流特性，评价对大坝安全的影响程度，黄河公司结合龙羊峡重力拱坝工程，利用大坝原型监测资料和理论分析方法，建立了拱坝超深强透水贯穿性断层岩体的蠕变分析模型及其数值模拟方法，对拱坝超深强透水贯穿性断层渗流性态进行了全面深入的分析。结果表明，龙羊峡大坝右岸坝基F120+A2断层渗流和变形性态变化尚属正常，其变化对大坝的工作性态尚未有明显的影响，就目前F120+A2断层的工作状态，尚不需要采取进一步加固处理。

关键词: 龙羊峡拱坝, 断层, 渗流特性, 研究