Application of orthogonal-contour method in calibration of microscopic parameters of rockfill materials

In order to solve the problem of large amount of calculation in calibration of microscopic parameters for rockfill materials in discrete element model, taking the laboratory tri-axial tests on the rockfill materials as the object, the methods of orthogonal tests and contour lines are used to determine the microscopic parameters of the rockfill materials rapidly on the basis of narrowing the scope of microscopic parameters and analyzing the sensitivity of the macroscopic behaviors of the specimens to the microscopic parameters. The results show that the multiple orthogonal tests can quickly narrow the range of microscopic parameters. The advantages of the orthogonal test and contour method can be used to calibrate the microscopic parameters in discrete element model. This method also provides reference for other materials to calibrate microscopic parameters.