In the ultra‐deep reservoir or other deep‐buried subsurface engineering, the in situ stress is high enough to make the rock transition from the brittle to the plastic. In such situation, the fracturing process always goes with the plastic deformation together. Therefore, to develop an elastoplastic constitutive model which can simultaneously account for both fracture and plastic deformation is critically important. In this paper, an elastoplastic augmented virtual internal bond (EP‐AVIB) model is developed. In EP‐AVIB, a hyperelastic AVIB is developed to characterize the elastic deformation of rock, in which the micro bond is linear elastic in compression whereas is hyperelastic in tension. The Drucker‐Prager yield criterion is employed to characterize the plastic deformation. Thus, the EP‐AVIB can combine the fracture and plastic deformation together. The simulation examples show that the EP‐AVIB can simulate the elastoplastic mechanical behaviors and the fracturing process of rock subjected to compression. It provides a simple approach to the elastoplastic failure simulation of rock. Its perspective in deep reservoir and deep‐buried subsurface engineering simulation should be inspiring.

Hua Zhang

Papers

Poroelastoplastic reservoir modeling by tangent stiffness matrix method