第一溢洪道是密云水库的重要泄水建筑物,建成后10多年在闸墩上发现了大量裂缝,成因为温度应力所致,后采用环氧灌浆进行处理,并埋设电测仪器进行观测。通过30 a来的观测成果进行系统分析,表明闸墩运行状况良好,当时采取的工程措施合理有效,但也存在一些问题需要解决。 The first spillway is an important drainage structure of the Miyun Reservoir. After more than 10 years of construction, a large number of cracks were found on the pier. The first spillway was caused by temperature stress. The first spillway was treated with epoxy grouting and embedded with electrical measuring instruments. The systematic analysis of the observed results of 30 years indicates that the pier operation is in good condition and the engineering measures taken at that time are reasonable and effective. However, some problems still need to be solved.