混凝土重力坝坝顶实测水平位移调研及分析

Investigation and analysis on measured horizontal displacement of concrete gravity dam crest

坝顶实测水平位移能最为直观地反映大坝实际运行性态,是混凝土重力坝的重要监测项目之一。笔者对我国电力行业的主要混凝土重力坝进行了调研,分析了各工程坝顶实测水平位移的量值、一般变化及分布规律,以及主要影响因素,并对坝顶上下游向水平位移的水压分量和温度分量占比进行了研究,成果表明:对于低坝和中坝,通常温度影响占主导;对于高坝,通常水压影响占主导。该研究可为混凝土重力坝监测资料分析及安全评价工作提供一定参考。

The measured horizontal displacement of the dam crest is an important monitoring item for the concrete gravity dam,which reflects the actual operation behavior of the dam most intuitively.The author studies the main concrete gravity dams in domestic power industry,then analyzes the magnitude,the general variation and distribution laws and the main influence factors of the measured horizontal dis placement of each dam crest.Besides,the proportion of water pressure component and temperature com ponent in the measured horizontal displacement of dam crest has been studied.The results show that for low dams and medium dams,the temperature influence usually dominates,and as regards high dams,the water pressure usually dominates.This study can provide some reference for monitoring data analy sis and safety evaluation of concrete gravity dams.