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四川石棉南桠河上兴建一座隧洞引水式中型电站。其埋藏式压力钢管道设计开挖断面为5.5米、坡度30°,1975年4月即将凿通斜穿洞室的断层F_1时,断层上盘涌出的地下水,以150米的水头喷射而出,涌水量达400升/秒,泥石流充塞导洞及施工支洞三十余米。数天后涌水渐小到每秒数十升,半年后才逐渐稳定到5-15升/秒。一年后共出渣二千多车,但洞中仍有大量堆渣。
Asbestos Nanchuan River in Sichuan to build a tunnel diversion medium-sized power station. The buried pressure steel pipe design excavation section is 5.5 meters, the slope of 30 °, April 1975 about to cut through the perforated chamber fault F_1, the ground fault gushing plate, with a head of 150 meters out , Gushing water up to 400 liters / sec, debris flow stuffed hole and construction branch hole more than thirty meters. A few days later, the gushing water became as small as tens of liters per second, gradually stabilizing to 5-15 liters / second after six months. A year later a total of more than 2,000 cars out of slag, but the hole is still a lot of slag.