Abstract: Because of complex geological condition, large dam height and storage as well as high operation water level, the operation performance of Longyangxia reservoir dam attracts lots of attention. By analysis on monitoring data by joint meters, the different changing law of the joint opening could be summarized and the joint condition could be assessed.

Key words: Longyangxia reservoir dam, construction joint, joint meter, monitoring data, law of opening

摘要： 龙羊峡水电站大坝坝高、库大、地质条件复杂，且大坝长期在低水头下运行，大坝的运行性态是大家十分关注的问题。从测缝计长期监测资料分析，龙羊峡大坝纵横缝测缝计监测资料变化规律不同于其他同类坝型测缝计资料的变化规律，且通过对测缝计监测资料变化规律的分析可以看出坝体接缝的状况。

关键词: 龙羊峡水电站大坝, 施工缝, 测缝计, 监测资料, 变化规律