龙羊峡水电站坝基断层 F120＋A2渗流性态分析及预测研究

摘要

针对龙羊峡水电站拱坝右岸坝基超深强透水贯穿性F120＋A2断层渗流问题，利用数值分析方法，研究F120＋A2断层渗流特性变化规律及渗流演变过程，同时分析库水位达正常蓄水位或高水位作用时间较长时，F120＋A2断层对大坝安全运行的影响。通过研究，对龙羊峡水电站坝基F120＋A2断层渗流状况进行评价，预测水库在校核洪水位下，F120＋A2断层渗流量不会大幅增加，暂不需对拱坝右岸坝基帷幕进行补充灌浆。%Aiming at the seepage from Fault F120+A2 which is deeply located, with strong permeability and penetrability, in foundation on right bank of Longyangxia Hydropower Station and by application of the value analysis method, property variation law and development of seepage from Fault F120+A2 are studied.Simultaneously, impacts of Fault F120+A2 to the safety operation of the dam are analyzed when the water level in the reservoir reaches the normal storage level or the higher water level keeps a long time.Through the study, the seepage from Fault F120+A2 is assessed .It estimates that the seepage from F120+A2 will not largely increase when the reservoir is at the check flood level.Therefore, additional grouting to the grouting curtain on right bank is not required.