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Abstract Based on the characteristic of gangue，a PFC3D model with contact-bond nonlinear constitutive behavior is established to simulate the triaxial compression tests of gangue. Different gradation projects of particle assembly are designed on the basis of Talbot?s theory；and gradation particle model is generated by using Fish language. The numerical simulation of triaxial compression test of gangue is conducted. The stress-strain curves，volumetric strain curves and microcracks propagation curves under different confining pressures are compared to verity the strength and deformation regulations of gangue with different gradations from mesoscopic view. The study result shows that optimal gradation of particles will improve the peak strength of gangue assembly and decrease its compressibility. The simulation results would be helpful for the optimal design of gangue backfill material in coal mining.
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Received: 26 November 2012
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2013, Vol. 32 
