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Abstract The brittle failure modes and mechanism of surrounding rocks should be studied and understood primarily. Furthermore，the rational evaluation of the brittle failure degree is crucial importance for stability analysis and control of surrounding rock mass in deep underground engineering. The test tunnels in Jinping II Hydropower Station are exactly constructed for these problems，the buried depth of 2 500 m is the maximum in the world. Based on the analysis of the experimental results，the engineering mechanical features of the marble T2b are studied. Then the failure modes and mechanism of the surrounding rock mass in the test tunnels are analyzed. And the range and depths of the failure zone in the test tunnels are calculated by numerical simulation method in which the constitutive model，RDM，for hard brittle marble and the FAI evaluation method are adopted. Finally，comparison between the calculated results and those revealed in the test tunnels is carried out. And the results obtained through comparison are satisfied. This study lays the solid foundation for the design of support parameters and establishment of the constructing measures in the excavation process of the diversion tunnels in this project.
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Received: 12 May 2010
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2010, Vol. 29 
