Numerical simulation of rock cutting process induced by a pick cutter considering dynamic properties of rock at intermediate strain rate

Rock excavation is a dynamic process where rock is dynamically loaded by mechanical cutting tools. Previous researches have shown that rock strength in dynamic loading is greater than that in static loading. However, existing prediction models for mechanical excavation of rock do not take into account the dynamic features of the rock. This issue has the potential to deliver misleading outcomes when estimating cutting performance and assigning an equipment for excavation work. The mechanical cutting issue was explored from a dynamic standpoint in this paper. To begin, the dynamic level of mechanical cutting was studied with multiple attempts and was shown to be at intermediate strain rate (ISR). Then, experiments were designed to determine dynamic mechanical properties via a loading device powered by a non-explosive powder reaction capable of creating dynamic loading in the ISR range. Furthermore, numerical simulation of pick cutting using the finite element technique was carried out, incorporating dynamic and quasi-static parameter settings. Also, a laboratory linear cutting test was conducted under various cutting configurations to validate the numerical results. The numerical simulation with quasi-static inputs was shown to be less accurate than the modeling with dynamic inputs. The simulation with dynamic inputs matches the laboratory findings closer by exhibiting a narrower margin. Thus, this study offers a unique view of evaluating mechanical excavation issues from a rock dynamic perspective.