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Abstract Based on existing research results and incremental dynamic analysis(IDA)，a performance-based seismic stability assessment approach specified for large underground cavern group is proposed. On the basis of this procedure，the selection of ground motions via PEER-NGA database，which provides the optimal input seismic ground motion for IDA，is discussed；and the selections of intensity measure and damage measure specified for large underground cavern group are processed，thereby providing appropriate earthquake intensity index and seismic performance characterization for IDA. The performance objectives are then classified based on the electricity generating duty of the cavern as serviceability and safety. Reference earthquake motions are specified for each objective as operating basis earthquake and safety evaluation earthquake. The underground cavern group of the Dagangshan hydropower project is taken as a demonstrating case. The results show that randomness of ground motion is well premeditated in this approach；and aseismic performances of cavern group can be given with this approach. Followed by probabilistic results of seismic vulnerability，this approach can provide criterion on the seismic stability assessment of large underground cavern group.
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Received: 21 October 2011
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2012, Vol. 31 
