坝肩岩土体成分复杂、结构差异性较大，在动静水压力的作用下结合部位多发渗漏安全问题。以某水库大坝渗漏调查为研究对象，有序采用测量、物探、钻探以及水文地质试验等技术手段探查大坝隐患空间位置信息及病因。勘察成果表明，无人机摄影技术清晰展示出渗漏点、塌陷区以及滑坡体之间的位置关系，从而指导物探工作需重点关注的部位是大坝左坝段；并行电法技术具有快速获取全大坝的电阻率分布的能力，结合瞬变电磁技术可进一步确定地质钻孔所布设的位置及区域；在桩号K0-000~0+040 m段钻探揭露出大坝坝基以块石体为主，并通过示踪试验建立了钻孔、塌陷区与渗漏点水之间的电导率联系，推断出水库渗漏与原滑坡体前的斜墙防渗体遭受破坏导致块石层内形成集中通道有关。根据探测研究成果确定出大坝渗漏通道的路径及分布范围，为水库大坝渗漏的定向防渗处理提供了靶区。

The rock and soil body composition of the dam abutment is complex， and the structures are quite different. Under the action of hydrodynamic and hydrostatic pressure， the safety problem of multiple leakage in the joint area， the seepage investigation of a reservoir dam is taken as the research object， the spatial location information and causes of dam hidden dangers are explored by means of measurement， geophysical exploration，drilling and hydrogeological test. The survey results show that the UAV photography technology clearly shows the location relationship between the leakage point， the collapse area and the landslide body， so as to guide the geophysical prospecting work. The focus is the left dam section of the dam. Parallel electrical method technology has the ability to quickly obtain the resistivity distribution of the whole dam. Combined with transient electromagnetic technology， the location and area of the verification borehole can be further determined. Drilling in the section of the pile number K0-000-0+040 m reveal that the dam foundation is mainly composed of block stones， and the electrical conductivity relationship between drilling， collapse area and leakage point water is established through tracer test. It is deduced that leakage is caused by the failure of the inclined wall impervious body in front of the original landslide and the formation of the dam leakage channel in the block stone layer. According to the detection research results， the path and distribution range of the dam leakage channel are determined， which provides a target area for the directional seepage control of the reservoir dam leakage.