Quantum mechanics

Engineering

Geotechnical engineering

Materials science

Mineralogy

Inclusion (mineral)

Economics

Geology

Porosity

Physics

Finite element method

Nonlinear system

Flow (mathematics)

Porous medium

Momentum (technical analysis)

Structural engineering

Fracture (geology)

Hydraulic fracturing

Finance

Mechanics

Extended finite element method

Fracture mechanics

Underground Space

In this study, we employ a coupled hydromechanical model to study the hydraulic fracture propagation path in porous media under the influence of existing pressurized voids. The hydraulic fracturing field study reveals that the existing natural voids and cracks alter the local properties of the porous media and influence the fracture propagation pattern. We incorporate these phenomena into the presented hydromechanical model, which is constructed from the mass and momentum balance equations for saturated porous media. The extended finite element method (XFEM) is applied for modeling the fluid flow through discrete cracks. The nonlinear hydromechanical equations are solved by the Newton–Raphson scheme with an implicit time integration procedure. Finally, numerical examples are presented and compared with experimental results. It is found that the fracture propagation path is significantly influenced by the existing pressurized voids and essential properties of the porous media; that is, the crack trends to propagate towards the pressurized voids.

Modeling hydraulic cracks and inclusion interaction using XFEM