In this study, we develop a coupled hydraulic fracturing model based on peridynamics, propose a contact-friction constitutive model, and establish a bond breaking criterion based on bond stress to explore hydraulic fracture propagation in jointed rock. Subsequently, we study the effects of fracturing fluid parameters (viscosity and pumping rate) on the fracture propagation behavior. Our results show that the viscosity of fracturing fluid can significantly affect the fracture morphology and propagation pattern. Fracturing fluid with higher viscosity is beneficial for the hydraulic fracture to cross natural fractures and continue to propagate in the original direction. The pumping rate mainly affects the fracture propagation speed and fracturing fluid pressure, but has limited influence on the fracture shape. Furthermore, the pumping rate has limited effect on the interaction between the hydraulic fracture and the natural fracture, but in general, lower pumping rate is conducive to the steady fracture propagation in jointed rock.

在本研究中，我们开发了基于近场动力学的耦合水力压裂模型，提出了接触摩擦本构模型，并建立了基于粘结应力的粘结断裂准则，以探索节理岩石中的水力裂缝扩展。随后，我们研究了压裂液参数（粘度和泵速）对裂缝扩展行为的影响。我们的研究结果表明，压裂液的粘度可以显着影响裂缝形态和扩展模式。较高粘度的压裂液有利于水力裂缝穿越天然裂缝并继续沿原方向扩展。抽速主要影响裂缝扩展速度和压裂液压力，对裂缝形状影响有限。此外，