浪详水电站砌石重力拱坝安全复核及除险加固防渗处理

Safety Checking and Anti-seepage Treatment Reinforcement for Masonry Gravity Arch Dam from Langxiang Hydropower Station

浪详水电站水库大坝高水位运行中,存在砌石拱坝坝体渗漏、砌石材料强度低等问题。为了消除水库大坝的安全隐患,提高大坝运行的安全可靠性,根据大坝渗漏现状和钻探分析资料,结合大坝坝基垂直正应力和稳定性复核成果,优选水泥砂浆充填灌浆为主的防渗补强除险加固方案。补强灌浆防渗处理后,经测试30个试验段透水率均在5 Lu控制范围内,坝体密实度得到有效增强,合格率达100%,并历经2年的高水位蓄水运行考验,工程整体运行状况良好。

The problems of body seepage at high operating water level and low masonry material strength in the masonry arch dam of Langxiang hydropower station was introduced first. In order to eliminate the security risk and enhance its safety and reliability,according to the dam seepage observation situation and drilling analyzing data,combining the dam foundation vertical positive-stress and stability checking results,the anti-seepage reinforcement scheme with cement mortar filling and grouting has been optimally adopted. The test results show that after the antiseepage reinforcement treatment the water permeability rate of 30 test sections with 100% pass rate which is within5 Lu,which can effectively enhance the density of the dam. The dam has experienced two years high water level operating tests,and the overall running is in good condition.