Abstract: Seepage is one of the main diseases of earth-rock dam. Seepage of dam abutment is a kind of common but special form, as its path is complex, the cause reasons are difficult to identify and the seepage maybe around abutment, through dam body or from the mountain beside the abutment. Based on the high density electrical method, the experimental research on abutment seepage of a reservoir dam in Nanjing is carried out. The high density electrical method is sensitive to low resistance abnormity area. The dam abutment is narrow and difficult to lay device. This difficulty is overcome by grid layout of test lines and the position and direction of seepage path in dam abutment is found out. By analyzing the relative change of the resistivity and the shape of contour lines, combining with the results of investigation and geological drill, the cause of seepage is found out. It proved that the high density electrical method is effective in the seepage detection of dam abutment.

Key words: seepage of dam abutment, detection, high density electrical method, line layout, earth-rock dam

摘要： 渗漏是土石坝主要病害之一，其中，坝肩渗漏是一种常见而特殊的渗漏形式，渗漏路径复杂，来水原因难以判断，可能为绕坝渗漏、坝体渗漏，也可能为坝肩侧山体渗水。高密度电法对坝体低阻异常具有较高的敏感性，采用高密度电法对南京某水库土坝坝肩的渗漏问题进行试验研究，采用网格化布置测线，克服了坝肩场地狭小难以布设电极的缺点，探明了坝肩渗漏通道的位置走向。通过分析探测视电阻率值的相对变化和等值线的形态，结合现场检查和钻孔的结果，分析得出了坝肩渗漏的原因，证明高密度电法在大坝坝肩渗漏检测中是有效的。

关键词: 坝肩渗漏, 探测, 高密度电法, 测线布置, 土石坝