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Modeling cohesive fracture propagation in partially saturated porous media with the assumed enhanced strain method
https://orcid.org/http://orcid.org/0000-0002-3451-2341
The assumed enhanced strain (AES) method is developed to simulate cohesive fracture propagation in the partially saturated porous media which includes the solid skeleton and the compressible pore water. The motivation of this research is to build a numerical framework allowing us to more physically investigate the complex coupled processes in the subsurface environment, such as the coupling between the solid skeleton deformation and fluid flow, fracture initiation and propagation driving by fluid flow and the evolution of water saturation and permeability. The detailed formulation describing the permeability enhancement due to fracture opening and volume increase is also presented. The numerical framework is based on the classical Biot’s mixture theory, where fractures can be naturally embedded into the framework with the AES method. The nonlinear discrete equations are derived by the consistent linearization technique and then solved with the Newton’s method. The AES method allows the fracture to propagate inside the elements and can be easily implemented in the standard nonlinear finite element codes. The implementation of the framework is fully verified with several numerical examples in comparison with the previous results published in the literature. The examples demonstrate that the proposed numerical framework is capable of capturing the interactions among the fracture, the bulk rock and the fluid flow. In the last example, we show the potential of the proposed framework in simulating the propagation of fluid-driven fractures.
Modeling cohesive fracture propagation in partially saturated porous media with the assumed enhanced strain method
https://orcid.org/http://orcid.org/0000-0002-3451-2341
The assumed enhanced strain (AES) method is developed to simulate cohesive fracture propagation in the partially saturated porous media which includes the solid skeleton and the compressible pore water. The motivation of this research is to build a numerical framework allowing us to more physically investigate the complex coupled processes in the subsurface environment, such as the coupling between the solid skeleton deformation and fluid flow, fracture initiation and propagation driving by fluid flow and the evolution of water saturation and permeability. The detailed formulation describing the permeability enhancement due to fracture opening and volume increase is also presented. The numerical framework is based on the classical Biot’s mixture theory, where fractures can be naturally embedded into the framework with the AES method. The nonlinear discrete equations are derived by the consistent linearization technique and then solved with the Newton’s method. The AES method allows the fracture to propagate inside the elements and can be easily implemented in the standard nonlinear finite element codes. The implementation of the framework is fully verified with several numerical examples in comparison with the previous results published in the literature. The examples demonstrate that the proposed numerical framework is capable of capturing the interactions among the fracture, the bulk rock and the fluid flow. In the last example, we show the potential of the proposed framework in simulating the propagation of fluid-driven fractures.
Modeling cohesive fracture propagation in partially saturated porous media with the assumed enhanced strain method
https://orcid.org/http://orcid.org/0000-0002-3451-2341
The assumed enhanced strain (AES) method is developed to simulate cohesive fracture propagation in the partially saturated porous media which includes the solid skeleton and the compressible pore water. The motivation of this research is to build a numerical framework allowing us to more physically investigate the complex coupled processes in the subsurface environment, such as the coupling between the solid skeleton deformation and fluid flow, fracture initiation and propagation driving by fluid flow and the evolution of water saturation and permeability. The detailed formulation describing the permeability enhancement due to fracture opening and volume increase is also presented. The numerical framework is based on the classical Biot’s mixture theory, where fractures can be naturally embedded into the framework with the AES method. The nonlinear discrete equations are derived by the consistent linearization technique and then solved with the Newton’s method. The AES method allows the fracture to propagate inside the elements and can be easily implemented in the standard nonlinear finite element codes. The implementation of the framework is fully verified with several numerical examples in comparison with the previous results published in the literature. The examples demonstrate that the proposed numerical framework is capable of capturing the interactions among the fracture, the bulk rock and the fluid flow. In the last example, we show the potential of the proposed framework in simulating the propagation of fluid-driven fractures.
Modeling cohesive fracture propagation in partially saturated porous media with the assumed enhanced strain method
Acta Geotech.
Liu, Fushen (author)
Acta Geotechnica ; 17 ; 1605-1626
2022-05-01
22 pages
Article (Journal)
Electronic Resource
English
Assumed enhanced strain method , Cohesive fracture model , Fluid-driven fracture propagation , Unsaturated poro-elasticity Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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