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Abstract For the soft and hard interbedded composite rock mass of Jinping I underground carves，interior heterogeneity information of meso-level is obtained by the technique of image segmentation based on region growing algorithm. Computational grid to reflect actual meso-structure is established. Then，a finite difference software package FLAC is used to study failure process under uniaxial compression test，considering effect of orientation angle by elasto-brittle-plastic model. The results show that with the change of orientation angle，stress distribution in rock mass is closely related to heterogeneity of rock materials in meso-level. All the fracture propagation process of samples initiates with tensile failure and ends in formation of main shear band. Furthermore，the appearance of failure along the long and short axial directions of soft rock is similar to experimental results in laboratory.
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Received: 13 August 2013
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2014, Vol. 33 
