(1. School of Water Resources and Environment，China University of Geosciences，Beijing 100083，China；2. Three Gorges Geotechnical Consultants Co.，Ltd，Wuhan，Hubei 430074，China)
Abstract：The stability of block is one of the key geological issues in the underground powerhouse caverns in the Three Gorges Project. Large-scale blocks can be easily developed due to enormous excavated surface associated with large spans and high side walls in underground caverns. The basic analysis process of GeneralBlock software is presented. First，the 3D block model is set up by GeneralBlock in order to identify and analyze the associated stability problem of rock block in vaults. Based on the modeling results，design and construction of effective reinforcement in accordance with combination of different types of rock blocks are put into practice. In addition，system monitorings for bolts，cables and blocks are set up. The safety monitoring results show that the deformation of block is less than 2 mm，and the stress of anchor bar and loss rate of cable remain stable. These outcomes indicate generally an effective reinforcement.
GOODMAN R E，SHI G H. Geology and rock slope stability application of the key block concept for rock slopes[C]// Proceedings of the 3rd International Conferences on Stability in Surface Mining. New York：[s. n]，1982：347-373.
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2011, Vol. 30 
