混凝土坝扬压力观测装置评价及其数据应用

Evaluation of Uplift Pressure Observation Device for Concrete Dam and Data Application

作为混凝土重力坝的重要荷载之一,坝基扬压力的大小及演变对大坝安全运行具有十分重要的影响。从监测装置评价、相关系数计算、监控指标拟定等方面说明了日常扬压力监测工作中需要注意的问题。给出了扬压力观测装置评价方法、标准,指出了强度系数计算中容易混淆的地方,通过置信区间法、典型小概率法、结构计算值、历史极值、规范允许值等手段,综合确定扬压力监控指标,并给出了应用原则。

As one of the important loads of concrete gravity dam, the magnitude and evolution of uplift pressure of dam foundation has a very important influence on the safe operation of the dam. This paper describes the problems needing attention in daily uplift pressure monitoring from aspects of evaluation of monitoring device,calculation of correlation coefficient and drafting of monitoring indexes. The evaluation method and standard of uplift pressure observation device are given, and the confusion in calculation of strength coefficient is pointed out.By means of confidence interval method, typical small probability method, structural calculation value, historical extreme value and allowable value of code, the uplift pressure monitoring index is determined comprehensively and its application principle is given.