光照水电站大坝坝基扬压力分析及监控限值的拟定

Analysis and Formulation of Monitoring Limits of Dam Foundation Uplift Pressure of Guangzhao Hydropower Station

以贵州北盘江光照水电站碾压混凝土坝坝基扬压力为研究对象,采用回归分析法作为分析手段,建立渗流统计模型,对大坝坝基扬压力监测数据进行整理分析,得出坝基扬压力安全监控指标。计算时选取水位变幅较大及扬压力强度系数较大的4个扬压力孔,作为监控指标分析对象,统计坝基扬压力水压、降雨、时效分量极限测值,研究提出2016—2020年坝基扬压力监控指标估算值,为大坝安全运行提前作出预警依据。

Taking the dam foundation uplift pressure of RCC of Guangzhao Hydropower Station of Beipanjiang River in Guizhou as the research object, the regression analysis method was used as the analysis method to establish the seepage flow statistical model. The monitoring data of dam foundation uplift pressure was sorted and analyzed, and the safety monitoring indicators of dam foundation uplift pressure was obtained. In the calculation, four uplift pressure holes with larger water level amplitude and larger uplift pressure intensity coefficient are selected as the analysis object of monitoring indicators,and the limit values of components of water pressure, rainfall, time of dam foundation uplift pressure are counted. The estimation value of monitoring indicators of dam foundation uplift pressure for 2016-2020 is researched and proposed, and provides an early warning basis for the safe operation of the dam.