某高拱坝左岸坝基排水洞渗漏水来源分析  

Analysis on the source of seepage water in the drainage tunnel of dam foundation on the left bank of a high arch dam

作　　者：李乾德 来记桃 李小伟 LI Qiande;LAI Jitao;LI Xiaowei(Yalong River Hydropower Development Co.,Ltd.)

机构地区：[1]雅砻江流域水电开发有限公司,四川成都610051

出　　处：《大坝与安全》2025年第1期9-15,共7页Dam & Safety

摘　　要：某高拱坝地处高山峡谷地区,水文地质条件复杂,蓄水后左岸坝基排水洞多个排水孔出现较大渗流,是工程关注的重点问题。为查明渗水原因,根据大坝蓄水期水文地质条件、渗控布置及处置措施、伪随机流场法探测、监测与检查等结果,结合近10年库水80 m循环升降运行下的监测资料,综合分析了该排水洞及幕后渗流渗压特征和渗水来源。结果表明,左岸坝基帷幕效果良好,渗流渗压逐年减小并趋于稳定,渗流量远小于坝基集水井设计抽排能力,渗水主要来源于山体地下水和下游河水,渗流安全可控。A high arch dam is located in an alpine valley with complex hydrogeological conditions.After impoundment,significant seepage has occurred in multiple drainage holes of the drainage tunnel of dam foundation on the left bank,which is a key concern of the project.To identify the cause of the seepage,based on the hydrogeological conditions during impoundment,seepage control and treatment measures,pseudo-random flow field method detection results,monitoring and inspection results,combined with nearly 10-year monitoring data under the 80 m cycle of reservoir water level fluctuation,a comprehensive analysis is conducted on the characteristics of seepage and seepage pressure in the drainage tunnel and behind the curtain,as well as the source of seepage.The results indicate that the curtain in dam foundation of the left bank is effective,the seepage and seepage pressure have decreased year by year and tend to stabilize,and the seepage volume is much smaller than the design pumping and drainage capacity of the dam foundation drainage well.The seepage mainly comes from mountain groundwater and downstream river water,and the seepage is safe and controllable.

关 键 词：拱坝 坝基 渗流量 安全监测 伪随机流场法 

分 类 号：TV698.1[水利工程—水利水电工程]