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美国在建的Kerckhoff2地下水电站的压力引水隧洞长6.7公里,内部直径为8.35～7.6米。洞线基本上穿过坚硬少断裂的花岗岩,其抗压极限强度约为
The pressurized diversion tunnel at the Kerckhoff2 groundwater station under construction in the United States is 6.7 kilometers long and has an internal diameter of 8.35 to 7.6 meters. The cave line basically passes through hard and less fractured granite, and its compressive ultimate strength is about