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Abstract In the southwest of China，many large-scale underground power stations were built in the high mountain zone with high in-situ stress. If the rock mass behaved brittle，splitting cracks would happen on the high side wall of underground caverns. The authors tried to study this kind of phenomena adopting laboratory tests，in-situ monitoring and theoretical analysis. Firstly，laboratory tests were carried out based on brittle rock-like samples，in which loading was applied in three directions at the beginning and was removed in one direction to simulate the excavation process. The splitting phenomena appeared in the tests. Then，a criterion presented before was applied to predicting the splitting failure depth of rock mass. In-situ monitoring aiming at abserving the splitting zone and displacement of rock mass was conducted，in which sliding micrometer and electric resistivity method were adopted. Afterwards，feedback analysis was carried out combining the excavation process of caverns. The latest established splitting analysis method considering energy dissipation was adopted to predict the displacement and splitting zone of rock mass caused by the following excavation and achieved some good results.
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Received: 12 February 2011
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2011, Vol. 30 
