Comparison of selected blasting constitutive models for reproducing the dynamic fragmentation of rock
Michał Kucewicz, Paweł Baranowski, Łukasz Mazurkiewicz, Jerzy Małąchowski
Abstract
Understanding the behavior of rock under blast- and shock-induced loadings requires a high-fidelity constitutive model. The present paper provides a detailed comparison study of three selected material models that are available in the most popular hydrocodes: the Johnson-Holmquist II (JH-2) model, the Johnson-Holmquist Concrete (JHC) model and the Karagozian and Case concrete (KCC) model. Numerical simulations are carried out to evaluate their performance under different stress conditions and to verify their effectiveness in realistically reproducing dolomite behavior. The outcomes are compared qualitatively based on specimen failure and quantitatively based on measured characteristics. The pros and cons of each model are presented and analyzed. Based on the comparison study, the JH-2 model is selected to simulate a representative blast in a mining face. The cracking, fracturing and fragmentation are correctly captured by the JH-2 model, proving its efficiency in the simulation of drilling and blasting in a mining face.