大黑汀水库主坝坝基21~#坝段量水堰异常值原因分析

Analysis on causation of abnormal value of measuring weir at dam-block No.21 of foundation for dam of Daheiting Reservoir

大黑汀水库主坝坝基21#坝段量水堰在运行过程中,监测测值出现异常偏大值,超过历史最大值一倍多。通过监测系统测试,现场及监测资料检查,采用统计模型回归分析、环境量过程线分析,并结合水平位移和垂直位移资料分析,全面解析量水堰异常偏大值产生的原因,得出结论:21#坝段量水堰异常值是由气温、水位以及监测特殊坝段等多种因素共同影响引起的,符合混凝土重力坝坝体正常运行规律,不存在破坏性渗漏。

During the operation of the measuring weir at the dam-block No. 21 of the foundation for the dam of Daheiting Reservoir,a larger abnormal value of the monitoring measurement appears,which is more than one times of the largest one in the history. Through the testing on the monitoring system and the check-up on the in situ and monitoring data,the causation of the abnormal value is fully analyzed in combination with the data of the horizontal and vertical displacements on the basis of the statistical model regression analysis and the analysis on the changing process line of environment variables. It is concluded that the abnormal value is caused by the common impacts from several factors such as air temperature,water level,special monitored dam block,etc.,and then accords with the normal operation law of concrete gravity without any destructive seepages therein.