长河坝水电站特高心墙堆石坝双防渗墙渗流控制特性反演分析  

Inversion analysis on seepage control characteristics of double cut-off walls for the extra-high core rockfill dam at Changheba Hydropower Station

作　　者：王相烜 刘得潭 何传凯 张志银 黄章鑫 徐力群[3] WANG Xiangxuan;LIU Detan;HE Chuankai;ZHANG Zhiyin;HUANG Zhangxin;XU Liqun(Sichuan Datang International Ganzi Hydroelectric Co.,Ltd.,Kangding 626001,China;Datang Hydropower Science&Technology Research Institute Co.,Ltd.,Nanning 530007,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]四川大唐国际甘孜水电开发有限公司,四川康定626001 [2]大唐水电科学技术研究院有限公司,广西南宁530007 [3]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电科技进展》2023年第5期88-93,99,共7页Advances in Science and Technology of Water Resources

基　　金：大唐集团公司科研项目(CHB-FW170-2021);国家自然科学基金项目(52179130)。

摘　　要：为高效反演模型渗流参数,建立有限元模型,采用多因素敏感性分析法研究了长河坝水电站特高心墙堆石坝坝基渗流控制特性对防渗系统各材料以及表层基岩的渗透系数的敏感性。结果表明:表层基岩和主防渗帷幕的渗透系数对双防渗墙各自阻挡水头比例影响较大,极差分别为0.174和0.125;其余材料渗透系数影响较小,敏感性由强到弱排序为副防渗帷幕、副防渗墙、主防渗墙、砾石土心墙;基于此结果的反演计算值与实测值之间误差不超过5%,满足工程应用要求。To efficiently invert seepage parameters,a multi-factor sensitivity analysis was used to study the sensitivity rank of the materials in the anti-seepage system and surface bedrock based on the seepage control characteristics based on a finite element seepage analysis model of the extra-high core rockfill dam at Changheba Hydropower Station.The results show that the surface bedrock and main anti-seepage curtain have a large impact on the reduced head ratios of the double cut-off walls,with a range of 0.174 and 0.125,respectively.The sensitivity of other anti-seepage structures is weak and the sensitivity ranging from strong to weak is the secondary anti-seepage curtain,the secondary cut-off wall,the main cut-off wall,and the core wall.The error between the inversion and measured values is less than 5%,which meets the engineering application requirements.

关 键 词：砾石土心墙堆石坝 双防渗墙 渗流控制特性 多因素敏感性分析 长河坝 

分 类 号：TV223.4[水利工程—水工结构工程]