高水头条件下高土石坝坝内超深混凝土防渗墙施工关键技术研究  

Key technologies for the construction of ultra-deep concrete cutoff walls in high earth-rock dams under high water-head conditions

作　　者：胡德春 HU Dechun(Sichuan Huadian Zagunao Hydropower Development Co.,Ltd.,Chengdu 610091,China)

机构地区：[1]四川华电杂谷脑水电开发有限责任公司,四川成都610091

出　　处：《水利建设与管理》2025年第4期42-47,共6页Water Conservancy Construction and Management

摘　　要：针对狮子坪水电站高土石坝在高水头(最大运行水头130m)运行条件下出现的渗漏与结构变形问题,通过新建超深混凝土防渗墙(最大深度150.5m)进行隐患治理。本文基于治理工程实践,系统总结了复杂地质条件下双轮铣槽机组合成槽、深槽孔斜精准控制、高水头防渗墙混凝土浇筑等关键技术,提出预灌浆固结、气举反循环清孔、接头管法接缝等创新工艺。工程实践表明:治理后坝基渗流量下降98%,渗压水头最大折减107.24m,验证了超深防渗墙在高水头土石坝加固中的有效性,可为类似工程提供重要技术参考。In order to address the seepage and structural deformation issues of the high earth-rock dam at Shiziping Hydropower Station under high water-head conditions(maximum water head 68 m),an ultra-deep concrete cutoff wall(maximum depth 150.5 m)was constructed for defect remediation.Based on the remediation project,this paper systematically summarizes key construction technologies,including combined trenching with double-wheel trench cutters,precise control of deep borehole deviation,and concrete placement for high water-head cutoff walls under complex geological conditions.Innovative techniques such as pre-grouting consolidation,air-lift reverse circulation hole cleaning,and the pipe-joint method for wall connections are proposed.Engineering practice demonstrates that post-remediation seepage flow decreased by 98%,with a maximum reduction of 107.24 m in seepage pressure head,verifying the effectiveness of ultra-deep cutoff walls in reinforcing high water-head earth-rock dams.The findings provide significant technical references for similar projects.

关 键 词：高水头 土石坝 超深防渗墙 双轮铣槽机 孔斜控制 狮子坪水电站 

分 类 号：TV52[水利工程—水利水电工程]