石头峡水电站面板堆石坝趾板岩体质量评价及缺陷处理

Rock Mass Quality Evaluation and Defect Treatment of Toe Slab of Face Rockfill Dam in Shitouxia Hydropower Station

石头峡水电站地处祁连山南麓,工程区属于高寒高烈度地区,地质构造复杂,新构造运动强烈,区域内地震频发,大坝为面板堆石坝,趾板基岩为前寒武系变质岩系,岩体经历多期构造运动,断裂构造发育。通过分析趾板岩体工程特性,评价趾板岩体质量,处理趾板存在的地质缺陷,使趾板岩体质量达到设计建基要求。目前坝后渗流堰观测数据及坝体渗流检测数据正常。

Shitouxia Hydropower Station is located in the south of Qilian Mountain, the area of project belongs to the al-pine and high intensity area,which is complex geological structure, regional earthquakes lrequently, and strong neotecton-ic movement. The dam is a lace rocklill dam, and the bedrock of toe slab belongs to precambrian metamorphic rocks. The multi - stage tectonic movement and fracture structure development is experienced by rock mass. In this paper, the engi-neering characteristics of toe rock mass are analyzed; the quality of toe plate rock mass is evaluated. The geological de-lects of toe slab are handled, to ensure the toe slab quality to meet the design requirements of loundation rock mass. Since then,observation data of llow weir and seepage detection data are normal of dam in currently.