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Abstract The underground powerhouse of Xiangjiaba hydropower station(33.4 m×85.2 m) is the largest underground powerhouse in the world. Excavation of large-span underground caverns in gently inclined stratum leads to significant stability problems of surrounding rock mass. Both 3D distinct element method and stress and displacement monitoring are used to study the surrounding rock mass stability，and two-ended anchor and systematic bolts are used to reinforce the surrounding rock mass. Then，based on the monitoring results，the stability of surrounding rock is analyzed. The research reveals the structure-controlled surrounding rock stability problem of shallow or middle buried cavern，and great attention should be paid to geology analysis and the survey of rock mass geometric features and discontinuity. It is appropriate to use the discontinuous medium mechanics method，and then to implement the corresponding optimal reinforcement measures.
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Received: 15 January 2010
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