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Abstract According to HC method applied to hydropower field，quality level of Danba hydropower station schistosity-like rock is classified as IV and the stability of surrounding rock is poor. The massive-like rock structure of quartz mica schist has been proposed by the macro-micro mechanical properties test of Danba quartz mica schist；and rock mass classification method has been modified reasonably. Uniaxial compression test and true triaxial tests under different confining pressures show that the anisotropy of schistosity is not obvious under the high stress. By casting thin meso-test，we find that Danba quartz mica schist is not rock mass structure of“layered structure”，but“massive-like”structure. On this basis，rock mass quality classification of the water diversion tunnel in Danba hydropower station has been modified to classification III. Finally，the self-stability of surrounding rock is favorable through on-site testing，acoustic detection and deformation analysis. And the revised criterion for classification has good applicability. Therefore，it is of great significance for rock mass classification to research rock mechanical characteristics under different stress environments，which can provide a reference for rock classification of similar hydropower engineering.
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Received: 28 May 2013
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2013, Vol. 32 
