Abstract
The calibration of dynamic mesoscopic parameters such as the normal critical damping ratio will directly affect the simulation results when wave velocity dynamic analysis is carried out on the particle discrete element rock model. This paper presents a fast calibration method for the normal critical damping ratio in the particle discrete element model. Firstly, the relationship between the normal critical damping ratio and the model energy attenuation rate is quantitatively analyzed based on the fundamental theory of discrete particle elements and energy conservation law. Then, based on the rock model with determined macroscopic mechanical parameters, the elastic longitudinal wave test is carried out to study the influence of the model energy attenuation rate with a normal critical damping ratio. The theoretical formula is modified according to the numerical results. Finally, the calibration formula of the normal critical damping ratio in the discrete particle element model is given. It is a new method to calibrate the normal critical damping ratio of the discrete particle model quickly and conveniently by using the theory of discrete particle elements and energy. It can provide a reference for constructing an accurate particle discrete element rock model.
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