全孔壁数字电视在检测某大型水电站坝体混凝土接缝的应用

Application of Digital Television System of Whole Hole Wall to Detection of Concrete Dam Joints for a Large Hydropower Station

全孔壁数字电视系统能够清晰、直观地反映出井内孔壁特征.将全孔壁数字电视系统应用到某水电站坝体的混凝土接缝检测上,辅助检测坝体混凝土浇筑质量.通过测试沿混凝土接缝不同方向布置的钻孔,获取混凝土接缝的张开度、延伸长度、渗水部位、渗水量等参数信息.由于蓄水期坝前水位不断升高,坝体前后受到的压力越来越不均衡.定期对钻孔进行全孔壁数字电视测试,并对获取的数据进行对比分析,为坝体的安全性评估提供科学依据.

Digital television system of the whole hole wall can intuitively and clearly reflect the features of the drillhole.This will be applied to the system of the concrete dam of a hydropower station on the joint detection,and aid detection of the quality of the dam＇s concrete pouring.By testing the drillholes in different directions along the concrete joint to obtain joint opening,extending length,seepage area,seepage volume and other parameters information.As the rising water level during the dam storage period,before and after the dam is not balanced morely by the increasing pressure.Regular test of the drillhole with this system,and comparatively analyzing the data obtained,so as to provide the scientific basis for safety assessment of the dam.