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Diffusive fluid‐driven brittle fracture in saturated porous media
Author(s) -
Heider Yousef
Publication year - 2018
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201800263
Subject(s) - mechanics , porous medium , materials science , fluid dynamics , brittleness , fracture mechanics , fracture toughness , poromechanics , porosity , geotechnical engineering , geology , composite material , physics
The aim in this research work is to develop a numerical model of fracturing of saturated, brittle porous materials. Different sources of the energy dissipation can be distinguished in this process, such as the crack propagation, the injection fluid flow in the crack and the fluid flow the surrounding porous domain (e.g. due to leak‐off). In this study, the phase‐field modelling (PFM) scheme together with the continuum mechanical theory of porous media (TPM) are applied. The proposed TPM‐PFM modelling framework accounts for the crack nucleation and propagation, deformation of the solid matrix and the different types of fluid flow in the porous domain and the crack. Additionally, an open system with possible fluid mass production from external source is assumed, where special focus is on the description of pressure time history at the injection location during the crack propagation. A major factor that influences the pressure history profile is the fluid viscosity, giving rise to the toughness‐dominated and viscous‐dominated responses. Therefore, the effect of the fluid type in the fracturing processes will be discussed in a numerical example.