Hydromechanical bond-based peridynamic model for pressurized and fluid-driven fracturing processes in fissured porous rocks

Abstract

In this paper, a new fully coupled hydromechanical model in terms of bond-based peridynamics is proposed to simulate the pressured and fluid-driven fracturing process in fissured porous rocks. A fissured porous rock model is established based on the classic Biot poroelasticity theory. The coupled hydromechanical bond-based peridynamic model consists of two parts: fluid flow and mechanical deformation. A governing equation of fluid flow in terms of peridynamics is established along with an integral-differential equation of motion in the fissured porous medium. Moreover, a fracture criterion in the hydromechanical bond-based peridynamic model is introduced to simulate the failure caused by high fluid pressure. Finally, four numerical simulations are conducted to verify the accuracy and correctness of the proposed model.