Study of Rock Damage Behavior Based on Configurational Mechanics

In the process of oil and gas drilling, under the action of mechanics, the wall rock will produce complex and high incidence of stress concentration, deformation, damage, cracking, fracture and other damage behaviors, resulting in the wall instability phenomenon. It may lead to complex accidents underground, resulting in huge economic losses. Therefore, it is of great theoretical and practical significance to grasp the failure behavior law of wellbore rock under mechanical action and study its failure mechanism. The early research on the instability and failure behavior of wellbore rocks was mainly based on the theory of fracture mechanics. Later, the theory of damage mechanics was introduced, which were all based on the theory of continuum. The development and change process of rock mechanical failure from small to large and from quantitative change to qualitative change caused by the accumulation of multiple defects in the internal microstructure of the rock can be described. This paper adopts the theory of configuration mechanics, which can well describe the complex microstructure and multi-defect evolution of materials such as inclusions, holes, dislocations, cracks, plastic flow, discontinuity, heterogeneity and anisotropy, and can be used to describe fracture mechanics. It provides a new idea for solving the complex defect problem.