某抽水蓄能电站上库坝表面变形监测及资料分析

Surface Deformation Monitoring and Data Analysis of of a Pumping Storage Power Station Upper Dam

某抽水蓄能电站上库坝在坝顶及坝后共布置3条表面变形测线,每条测线布置6~9个水平垂直位移测点,并在两岸布置倒垂线和水准基点,以此为测量基点分别采用前方交会法、几何水准法测量坝体表面水平、垂直位移。经系统分析,该工程表面水平位移、垂直位移测量方法可行,监测精度满足相应规范要求和工程安全监测需要。多年监测资料显示,上库坝表面水平、垂直位移变化已收敛,变化规律合理,符合土石坝的一般变形规律,为大坝的安全运行管理提供了重要的数据支持。

Three surface deformation measurement lines are arranged at the top and back of an upper pumping storage dam,and 6-9 horizontal and vertical displacement measurement points are arranged on each line,and inverted vertical lines and horizontal base points are arranged on both sides of the dam.On this basis,the horizontal and vertical displacement of the dam surface are measured by the forward intersection method and geometric leveling method respectively.Through systematic analysis,the measurement method of horizontal displacement and vertical displacement of the engineering surface is feasible,and the monitoring accuracy meets the requirements of corresponding specifications and engineering safety monitoring.The monitoring data for many years show that the horizontal and vertical displacement of the upper dam surface converges and the variation law is reasonable,which accords with the general deformation law of earth-rock dam,and provides important data support for the safe operation and management of dam.