Abstract: After studying such features as underdeveloped kast in junction region and fault in river direction, on the left bank of seepage control engineering development of monoclinic and reverse mainly of phyllite stratum, new micro—fresh phyllite permeable, by reviewing the geological conditions of the early stage and under the excavation in conjunction with assessment of rock peameability in junction region，it was judged that the possibility of deep percolation and concentrated leakage path was small, But the water pressure data show that the bottom of the curtain was still developing highly permeable rock, in view of the engineering geological complexity, the possibility of slight leakage along the local highly permeable rock mass still exists. Through a comprehensive analysis by various means and methods it is considered that dam leakage is most likely at the superficial local defects of shallow surface and water leakage from inside to outside of the tunnel on left bank.

Key words: water conservancy and hydropower engineering, geotechrical engineering, concrete face rock-fill dam, seepage control engineering, curtain grouting, leakage

摘要： 结合枢纽区岩溶和顺河向断层不发育，左岸渗控工程发育单斜、逆向为主的千枚岩地层，微新-新鲜千枚岩透水性小的特点，通过复核前期和开挖工程地质条件，结合枢纽区岩体渗透特性评价，判定深层绕渗和集中渗漏通道的可能性小；压水资料显示帷幕底部仍发育强透水岩体。鉴于工程地质复杂性，认为有沿局部强透水岩体轻微渗漏的可能。通过多种手段和方法综合分析认为:大坝漏水最大可能是由浅表部的局部缺陷和左岸洞室内水外渗而引起。

关键词: 水利水电工程, 岩土工程, 混凝土面板堆石坝, 渗控工程, 帷幕灌浆, 渗漏