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南告水电站的大坝为浆砌石重力坝,最大坝高78米.坝基位晚侏罗世燕山第三期粗粒黑云母花岗岩岩体上,处于我省有名的莲花山大断裂带的五指嶂——锅子嶂动热变质带之中.主要断裂有北西、北北西、北北东、北东、近东西五组(见图1).其中北西和北东向的构造岩以黑白色条带状糜棱岩为主,胶结较好;其余各组以片状构造岩或压碎岩为主.断层带宽一般1～30厘米,个别100～15O厘米.断层间距0.5～10米不等.煌斑岩脉多沿北西、北北西、个别沿北东向侵入.岩脉宽50～200厘米,间距5～15米.与围岩接触北东向胶结较好;北西和北北西向在其接触面上往往有后期再次错动产生的宽10～50厘米的断层角砾岩,较易风化.
The dam of Nanxiao Hydropower Station is a mortar-masonry gravity dam with the maximum height of 78 meters. On the third base of Late Jurassic Yanshanian granodiorite granite rock mass in the dam foundation, - Plutonium moving thermal metamorphic belt among the main faults are North West, North North West, North North East, North East, Near East and West five groups (see Figure 1) .Northwest and northeast of the tectonic rocks in black and white bands Like mylonites, the cementation is better; the rest of the group to sheet tectonic rocks or crushed rock-based fault width generally 1 to 30 cm, the individual 100 ~ 15O cm. Fault spacing of 0.5 to 10 meters. The porphyry veins are mostly northwestern, northwestern and western, and some are intruded along the north-eastward direction.The veins of the veins are 50-200 cm wide and 5-15 m apart.The north-eastbound contact with the surrounding rock is better than that of the northwestern and northwestern- There are often late in the face of the wrong move again produced 10 to 50 cm wide fault breccia, more prone to weathering.