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在高压输水隧洞及地下厂房围岩中,遇水膨胀的蚀变岩带十分发育。但根据水压致裂原地应力的测量结果及最小主应力设计准则,广州抽水蓄能电站的高压输水隧洞甚至高压岔管段均取消了钢衬。电站建成以来的安全运行表明,该设计是完全合理的。实践表明:在充分利用岩体自身的承载能力,优化工程设计方面,水压致裂原地应力测量具有十分重要的意义。
In high-pressure water tunnel and underground powerhouse rock, water-swelled alteration rock belt is developed. However, according to the measurement results of in-situ stress of hydraulic fracturing and the design guideline of the minimum principal stress, the steel lining is canceled in the high-pressure water diversion tunnel and even the high-pressure bifurcation section of Guangzhou Pumped Storage Power Station. The safe operation since the completion of the power station shows that the design is completely reasonable. Practice shows that it is of great significance to make full use of the bearing capacity of rock mass and optimize the engineering design.