A fully coupled thermomechanical peridynamic model for rock fracturing under blast loading considering initial pore damage

Rock blasting is widely used in various engineering constructions. Local temperature rise in rock mass caused by the blasting load significantly influences the physical properties of rock materials. To simulate rock fracturing under blast loading, a fully coupled thermomechanical peridynamic (PD) model is presented and improved by volume correction, surface correction, and GPU parallel technique. An initial damage model is incorporated to consider the influence of the initial pore damage in rock mass on the fracture pattern under blast loading. Through three benchmark problems, the PD model is qualitatively and quantitatively validated against results obtained from FEM simulations. The initial damage induced by randomly distributed pores of rock mass is considered in the PD modeling of the granite fracture subjected different blast loads. The correlation between temperature distribution and crack pattern is analyzed, the results show that temperature influences both radial and circumferential crack expansion, and the initial pore damage can affect the crack and fracture patterns in granite specimen.