洪门水电站大坝为土坝,坝长278m,坝高38.7m.1958年兴建时,坝基未设混凝土盖板,其粘土心墙直接座落在基岩上.1964年钻孔时,发现在大坝轴线 0+074和0+109桩号附近,分别有贯穿大坝上下游的F_(11)和F_(23)断层破碎带(见图1).其中F_(23)为平移断层,产 Hongmen Hydropower Station dam earth dam, dam length 278m, dam height 38.7m.1958 years built, there is no concrete cover dam foundation, the clay core wall is located directly on the bedrock .1964 drilling, found in large F_ (11) and F_ (23) fault rupture belts (see Figure 1), which run through the upstream and downstream of the dam, respectively, near the 0 + 074 and 0 + 109 stakes on the dam axis, of which F_ (23)