FINITE ELEMENT ANALYSIS OF SEEPAGE IN ROCK BASED ON CONTINUUM DAMAGE EVOLUTION

Based on continuum damage mechanics, a seepage model for damaged rock reservoirs is established in this paper, which can be used to analyze the damage failure process and seepage characteristics of rock reservoirs. Weibull distribution is used effectively to simulate the heterogeneity characteristics of rock. By statistical strength theory, the Drucker-Prager strength criterion and continuous damage theory, the governing equations and definite conditions of continuous damage evolution via the Biot constitutive relation for rock reservoirs are derived, which are then solved by the finite element method (FEM) to obtain reliable results. Numerical examples are given to show that the proposed method is consistent with the experimental results and to demonstrate the effectiveness and reliability to analyze seepage characteristics, volume fracturing and the mechanical properties of laminated rock mass.