Abstract：In order to verify the feasibility of calibration method for micro parameters of a PFC model, taking wheat samples as an example, according to the requirements of calibration method for micro parameters provided by PFC software, first, triaxial tests were conducted in laboratory, then, numerical triaxial tests to model the laboratory tests were conducted by PFC as well.Research shows that numerical results could approach experimental results by adjusting micro parameters repeatedly, but it is almost impossible to make them coincide with each other.Under the same level, the particle friction coefficient of numerical model has significant effects on deviatoric stress. The initial slope of curve of deviatoric stress and strain is controlled by particle normal stiffness. The tendency of curve of deviatoric stress and strain is impacted by particle porosity.

Keywords: wheat; PFC model; micro parameter; calibration method