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(一)概况 南垭河三级电站有压引水隧洞全长7016m,设计内径4.5m。洞线穿过地带为早震旦世的中粗粒花岗岩,岩体经多次构造变动,遭受强烈破坏,岩脉穿插繁杂,断层纵横交错,岩体稳定性较差,抗压强度一般为50～90MPa。 岩脉以辉绿岩脉为主,约为60％以上,其次为闪长岩脉,个别地段出现细晶花岗岩脉。岩脉厚度一般小于2m,其接触面清晰,界面平滑,多伴有断裂,一般挤压破碎。 断层一般为糜棱岩,片状千糜岩及片状岩组成;多充填断层泥,松软破碎,变模为100～200MPa。其厚度0.5～2.0m,隧洞通过地段断层累计长度约为287m,约为洞长的4.1％。断层主要以逆平移形式出现,以压扭性为主,张扭性次之。
(A) Overview Nanyapa three hydropower stations with diversion tunnel full length 7016m, design diameter 4.5m. The hole line passes through the area as early Neocentral medium-sized granite. The rock mass undergoes many structural changes and is subject to strong damage. The dike is complicated and the faults are criss-cross. The rock mass has poor stability and the compressive strength is generally 50 ~ 90MPa. The dikes are mainly diabase dikes, accounting for more than 60%, followed by diorite veins and fine-grained granite veins in individual areas. The thickness of the veins is generally less than 2m, the contact surface is clear, the interface is smooth, often accompanied by rupture, the general crushing. Faults are generally mylonite, phyllonite and flaky rock composition; multi-filling fault mud, soft broken, change the mold to 100 ~ 200MPa. The thickness of 0.5 ~ 2.0m, the total length of fault through the tunnel section is about 287m, about 4.1% of the length of the hole. Fault mainly in the form of anti-translation, mainly to the pressure and torsion, tension and torsion followed.