Abstract:

The three dimension particle flow code calculation program is used to simulate the large scale triaxial drained shear test of rockfill materials. During the formation of numerical specimen a procedure is writing to generate particles of assemly until the target porosity and gradation composition are achieved. Dynamic relaxation method is applied to solve DEM (discrete element method) equation. Local damping is used to accelerate to arrive at a steady solution in a reasonable number of cycles to dissipate energy of the particle system. Normal and shear contact bond strengths are used to increase the assemly’speak strength.With the selected micro parameters the numerical simulation tests of the large scale triaxial test are performed under series of confining pressures. The stress-strain curves from numerical simulation with the selected micro parameters are in agreement well with the results of the laboratory test. So the particle flow code program is a better method to simulate the large scale triaxial drained shear test of rockfill materials. A large range of shear dilatancy occurs with the increase of axial strain because particle shape and breakage are not considered.

Key words: rockfill materials, large scale triaxial test, particle flow code, meso-mechanics simulation