Hydromechanical modeling of solid deformation and fluid flow in the transversely isotropic fissured rocks

Geomaterials containing fissures such as some sedimentary rocks often exhibit a bimodal pore size distribution, and they are also inherently anisotropic due to the distinct bedding planes. Hydromechanical modeling of solid deformation and fluid flow of such geomaterials remains a significant challen...

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Vydáno v:Computers and geotechnics Ročník 128; s. 103812
Hlavní autor: Zhang, Qi
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York Elsevier Ltd 01.12.2020
Elsevier BV
Témata:
Algorithms
Anisotropy
Boundary value problems
Computational fluid dynamics
Constitutive models
Coupled formulation
Deformation
Double porosity
Elastoplasticity
Fluid flow
Geomaterials
Mathematical models
Modelling
Parameters
Pore size
Pore size distribution
Porosity
Return mapping algorithm
Sedimentary rocks
Simulation
Size distribution
Strain
Strain localization
Tensors
Transverse isotropy
Transverse isotropy
Strain localization
Elastoplasticity
Double porosity
Coupled formulation
Return mapping algorithm
ISSN:0266-352X, 1873-7633
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Shrnutí:Geomaterials containing fissures such as some sedimentary rocks often exhibit a bimodal pore size distribution, and they are also inherently anisotropic due to the distinct bedding planes. Hydromechanical modeling of solid deformation and fluid flow of such geomaterials remains a significant challenge. In this paper, we have developed a unique anisotropic double porosity elastoplastic framework to describe such processes. Furthermore, for the solid constitutive model, because of the loss of stress tensor coaxiality between the trial state and the final state, we have derived a new implicit return mapping algorithm to obtain the updated effective stress, history parameters and consistent tangent operator for any given strain increment efficiently, followed by a uniaxial strain point simulation to provide benchmark results. Subsequently, 3D stress point simulations are carried out to calibrate the projection and plasticity parameters using triaxial experimental data as well as to illustrate the strain-softening phenomenon. Initial boundary value problem simulations have been conducted to analyze the impacts of fluid flow and solid constitutive model on the resulting geomaterials’ responses. The overarching goal of this paper is to better understand the coupled solid deformation-fluid flow in the transversely isotropic fissured rocks.
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ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2020.103812