长河坝大坝施工期安全监测成果分析

Analyses of Safety Monitoring Results in Construction Period of Changheba Dam

通过对长河坝大坝施工期监测成果进行分析,获得深厚覆盖层上建高堆石坝的监测经验,掌握心墙和堆石体的变形情况和渗流情况。监测结果分析表明,长河坝水电站安全监测设计仪器选型和布置合理,满足有关规范要求;坝体沉降量与坝体填筑过程呈正相关;下游坝坡左右岸水平位移总体呈现向河床中部靠拢趋势,上下游水平位移呈现向下游变形,变形特征符合一般规律;主副防渗墙之间坝基实测水位均低于上游水位,主防渗墙下游侧坝基实测水位均低于上游水位,且水头差在副防渗墙后进一步折减,符合一般规律。

The monitoring data of Changheba Dam in construction period are analyzed. The monitoring experiences of high rockfill dam built on deep overburden are obtained and the deformation and seepage of core wall and rockfill body are obtained. The monitoring results show that, （a） the equipment selection and arrangement for dam safety monitoring of Changheba Hydropower Station meet the requirements of relevant specifications; （b） the settlement of dam is positive correlation to dam filling process; （c） the left and right-bank horizontal displacements of downstream dam slope tends to move closer to the middle of riverbed and the upstream and downstream horizontal displacements of dam present an overall trend to move closer to downstream, which are in line with general deformation rules; and （d） the water levels of dam foundation between primary and secondary cutoff walls and in the downstream of primary cutoff wall are lower than upstream water level, which are also in line with general seepage rules.