本文以南桠河三级水电站闸基混凝土防渗墙为例,论述防渗墙开口缝形成的原因及其危害性,强调对开口缝必须认真处理。文中阐述了处理方案设计应考虑的因素,强调越工中须采取一系列有效措施保证墙体质量,以防患于未然。 Taking Nanzhahe III hydropower station sluice-foundation concrete cutoff wall as an example, the paper discusses the reason and the harmfulness of the open cut of the cut-off wall, emphasizing that it is necessary to deal with the crack seriously. The paper elaborates the factors that should be considered in the design of treatment schemes and emphasizes that a series of effective measures must be taken to ensure the quality of the wall in the process of overcoming the accident so as to prevent the accident from happening.