锦屏二级水电站深埋长隧洞群的建设和工程中的挑战性问题

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Abstract Jinping II hydropower station includes four diversion tunnels，two auxiliary tunnels and one drainage tunnel，with a total tunnel length of 118 km. These tunnels are characterized as thick overburden，long length，large size in diameter，high geostress，complicated engineering geological conditions and high difficulty for project layout，which make the tunnel project the largest and most difficult hydro-tunnel group in the world. Key technical problems were met during the tunnels excavation，including the forecast and treatment of groundwater，and the prevention of rock burst. The studies and measures adopted against rock burst，the gushing water and the instability of surrounding rock mass during the construction of tunnels are summarized. The experience accumulated during the construction of the tunnels in Jinping II hydropower station shall provide valuable reference for similar projects.

Key words： tunnelling engineering Jinping II hydropower station underground engineering rock burst groundwater

Received: 28 May 2010

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http://www.rockmech.org/EN/Y2010/V29/I11/2161

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