Similar experimental study on the effect of particle size on the creep parameters of Burgers model of granular accumulation

In order to study the deformation behavior of sand granular material accumulation during settlement, this study carried out the triaxial compression creep test by step loading, and obtained three groups of creep deformation-time curves of glass beads with different particle sizes (0.6~0.8 mm, 1.0~1.5 mm, 2.0~2.5 mm).The four element Burgers model was selected to fit and analyze the test curve, from which the parameters of creep characterization of glass beads were obtained.The discrete element numerical model was established to verify the parameters of the Burgers model.Results show that the creep characteristics of glass beads under triaxial compression can be described by the Burgers model.The four parameters E_k、E_m、η_k、η_mof the Burgers model have negative correlation with particle size and axial pressure.The macro Burgers model parameters obtained from the test are transformed into the micro Burgers model parameters in the particle flow program.The simulation results are in good agreement with the test results.The comparison results verify that the particle flow Burgers model is suitable for the experimental study of rock particle creep.