An important aspect in an underground radioactive waste disposal project is the characterization ... more An important aspect in an underground radioactive waste disposal project is the characterization of hydrogen production due to steel container corrosion and its migration in the initially water-saturated host rock. For the French repository project, gas injection tests into initially saturated samples of the Callovo-Oxfordian (COx) claystone were conducted to mimic these phenomena. They showed an important expansion of the tested samples. In this paper, a series of hydromechanical simulations were performed, within the framework of two-phase flow in deformable porous media, to explain both hydraulic and mechanical responses of the material in those experiments. The analysis of experimental and numerical results suggested the simultaneous advance of gas and damage fronts through the sample. The increasing gas pressure led to the decay of the material rigidity and, consequently, to the alteration of the hydraulic properties, particularly the permeability. Simultaneously, the mechanical damage caused a significant expansion of the tested COx samples. The good agreement between the experimental and numerical results supported these explanations and should lead, in future works, to a more complete hydromechanical model aiming to simulate the problem of hydrogen production and migration.
In a nuclear disposal project, the damage of the hosting rock
is a capital issue that should be s... more In a nuclear disposal project, the damage of the hosting rock is a capital issue that should be studied and understood. This problem is even more complex when the studied rock is anisotropic. In the present paper, a damage model that takes into account both initial and induced anisotropy is introduced using equivalence relations between the real material and a fictitious isotropic one on which we can take all the advantages of the well established isotropic theory. Numerical simulations using a Finite Element Method (FEM) code shows an agreement between the theoretical predictions and the experimental data of Brazilian tests wi th different orientation angles.
An important aspect in an underground radioactive waste disposal project is the characterization ... more An important aspect in an underground radioactive waste disposal project is the characterization of hydrogen production due to steel container corrosion and its migration in the initially water-saturated host rock. For the French repository project, gas injection tests into initially saturated samples of the Callovo-Oxfordian (COx) claystone were conducted to mimic these phenomena. They showed an important expansion of the tested samples. In this paper, a series of hydromechanical simulations were performed, within the framework of two-phase flow in deformable porous media, to explain both hydraulic and mechanical responses of the material in those experiments. The analysis of experimental and numerical results suggested the simultaneous advance of gas and damage fronts through the sample. The increasing gas pressure led to the decay of the material rigidity and, consequently, to the alteration of the hydraulic properties, particularly the permeability. Simultaneously, the mechanical damage caused a significant expansion of the tested COx samples. The good agreement between the experimental and numerical results supported these explanations and should lead, in future works, to a more complete hydromechanical model aiming to simulate the problem of hydrogen production and migration.
In a nuclear disposal project, the damage of the hosting rock
is a capital issue that should be s... more In a nuclear disposal project, the damage of the hosting rock is a capital issue that should be studied and understood. This problem is even more complex when the studied rock is anisotropic. In the present paper, a damage model that takes into account both initial and induced anisotropy is introduced using equivalence relations between the real material and a fictitious isotropic one on which we can take all the advantages of the well established isotropic theory. Numerical simulations using a Finite Element Method (FEM) code shows an agreement between the theoretical predictions and the experimental data of Brazilian tests wi th different orientation angles.
Uploads
Papers by M. Tijani
is a capital issue that should be studied and understood. This problem is even more complex when the studied rock is anisotropic. In
the present paper, a damage model that takes into account both initial and induced anisotropy is introduced using equivalence relations between the real material and a fictitious isotropic one on which we can take all the advantages of the well established isotropic theory. Numerical simulations using a Finite Element Method (FEM) code shows an agreement between the theoretical predictions and the experimental data of Brazilian tests wi
th different orientation angles.
is a capital issue that should be studied and understood. This problem is even more complex when the studied rock is anisotropic. In
the present paper, a damage model that takes into account both initial and induced anisotropy is introduced using equivalence relations between the real material and a fictitious isotropic one on which we can take all the advantages of the well established isotropic theory. Numerical simulations using a Finite Element Method (FEM) code shows an agreement between the theoretical predictions and the experimental data of Brazilian tests wi
th different orientation angles.