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Abstract Splitting failure happened frequently in the brittle surrounding rock mass of underground powerhouse cavern groups in southwest of China while excavation was performed. This kind of special engineering phenomenon has obtained become more and more attentions now. Adopting the linear slippage crack groups splitting model and applying fracture mechanics，energy analysis and crack propagation，the splitting criterion of cavern rock mass and displacement forecasting method reflecting splitting opening displacement was derived. Meanwhile，the effect of intrinsic cracks propagating into macroscopical splitting cracks parallel to the side wall of caverns approximately was considered. Moreover，the forecasting method was applied to the Jinping I hydropower station underground caverns engineering in China；the splitting failure zone and forecasting displacement were coincide with the monitoring data. The new forecasting displacement method could benefit the construction of similar underground caverns.
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Received: 30 January 2011
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2011, Vol. 30 
