Abstract: The diversion tunnels of Jinping Ⅱ hydropower station extend across Jinping mountain, including the areas with high stress and high external water pressure. The tunnel section is huge. In order to ensure the long-term and safe operation of the power station, the maintenance channels are arranged for diversion tunnels. This paper introduces the design and structural calculation of the maintenance shaft of emergency gate in water inlet and the access door of construction adit at the head and end of the diversion tunnel.

Key words: Jinping Ⅱ hydropower station, diversion tunnel, maintenance channel, steel lining, numerical simulation

摘要： 锦屏二级水电站引水隧洞跨越锦屏山，断面巨大，沿线跨越高应力、高外水压力赋存区，为确保电站长久 安全运行，针对引水隧洞检修布置了便利通道。笔者介绍了电站进水口事故闸门检修竖井和引水隧洞首端、末端 施工支洞进人门检修通道的设计和结构计算。

关键词: 锦屏二级水电站, 引水隧洞, 检修通道, 钢板衬砌, 数值模拟