钢锚墩在锦屏一级水电站地下厂房的运用

锦屏一级水电站地下厂房地应力高,分层开挖完成后随着地应力的释放及重新分布,局部岩体出现压碎、层状劈裂破坏,围岩松弛深度及变位不断加深、加大。为了尽快实现锚索锚固支护效应以确保地下厂房洞室群围岩稳定和工程安全,施工时将部分原设计现浇混凝土锚墩调整为钢锚墩进行施工,取得了较好的质量、进度效果。主要介绍了钢锚墩的施工工艺、质量控制要点及其与混凝土锚墩的工效对比分析。

Application of Steel Anchor Pier of Underground Powerhouse in Jinping First Stage Hydropower Station

Because of the high ground stress of underground powerhouse in Jinping first stage hydropower station,the local rock crushing,layered split damage and surrounding rock depth deepening displacement enlarging occurred with the release of stress and re-distribution.In order to realize anchorage support effect as soon as possible to ensure bracing surrounding rock stability and engineering safety,the original design of in-situ concrete anchor pier was adjusted to be steel anchor pier with good quality and progress.The paper describes the steel anchor pier construction process,quality control points and the comparative analysis on ergonomics with concrete anchor pier.