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Table of contents
Chapter Ⅰ Methodology and Theoretical Background
1.1 Methodology
1.1.1 Experiment apparatus
1.1.2 Strain and ultrasonic measurements
1.1.3 The brittle regime: definition of the stress states C’ and D’
1.1.4 Ultrasonic measurements and acoustic emission (AE)
1.1.5 Velocity model for AE hypocenter location
1.1.6 Acoustic location algorithm
1.1.7 Permeability measurement
1.2 Theoretical background
1.2.1 Fracture mechanics
1.2.2 Effective Medium Theory
1.2.3 Wing crack model
1.2.4 Subcritical crack growth
1.2.5 Stress-dependent permeability
1.2.6 Construction of a nonlinear diffusion equation
Chapter Ⅱ Physical and Mechanical Properties of Thermally Cracked Andesite Under Pressure
2.1 Introduction
2.2 Material & Methods
2.2.1 Materials
2.2.2 Experimental Methods
2.3 Results
2.3.1 Properties of samples heat-treated at different temperatures
2.3.2 Mineralogical effects of heat treatment on andesite
2.3.3 Tri-axial deformation of non-heat-treated andesite and heat-treated andesite
3.3.4 Ultrasonic velocity evolution of heat-treated andesite
2.4 Discussion
2.4.1 Effect of the heat treatment on the crack density
2.4.2 Effect of heat treatment on the microstructure: partial melting
2.4.3 Effect of heat treatment on mechanical strength
2.5 Conclusions and Perspectives
2.6 Appendix
Chapter Ⅲ Influence of Hydrothermal Alteration on The Elastic Behavior and Failure of Heat-Treated Andesite from Guadeloupe
3.1 Introduction
3.2 Material and methods
3.2.1 Starting material, heat-treatment and artificial alteration
3.2.2 Characterization of mineral sand chemical contents
3.2.3 Petrophysical properties
3.2.4 Experimental Apparatus
3.3 Results
3.3.1 Evolution of mineralogy with heat-treatment and alteration
3.3.2 Evolution of petrophysical properties with heat-treatment and alteration
3.3.3 Evolution of the elastic behaviour under hydrostatic stress with heat-treatment and alteration
3.3.4 Evolution of the mechanical behaviour during triaxial loading and failure with heat-treatment and alteration
3.4 Discussion
3.4.1 Alteration, porosity and density
3.4.2 Can smectite precipitation in cracks explain the mechanical behaviour?
3.4.3 Modelisation
3.4.4 Implications
3.5 Conclusion
Chapter Ⅳ Fluid-Injection Induced Rupture in Thermally Cracked Andesite at Laboratory Scale
4.1 Introduction
4.2 Material & Methods
4.2.1 Materials
4.2.2 Experiment Methods
4.3. Results
4.3.1 Mechanical properties of heat-treated andesite under hydrostatic loading
4.3.2 Differential loading of heat-treated andesite sample under saturated condition.
4.3.3 Fluid injection induced rupture on heat-treated andesite sample
4.4 Discussion
4.4.1 Crack density inverted from hydrostatic loading under dry condition
4.4.2 Aspect ratio/crack length/crack aperture inverted from hydro-loading under saturated conditions
4.4.3 Fluid injection into heat treated saturated andesite sample
4. 5 Conclusions
Chapter Ⅴ Permeability Evolution and Its Effect on Fluid Pressure Temporal Spatial Distribution during Fluid Injection
5.1 Introduction
5.2 Methodology
5.2.1 Sample preparation
5.2.2 Experiment apparatus
5.2.3 Optical Fibers
5.3 Results
5.3.1 Fluid pressure temporal spatial distribution
5.3.2 Permeability variation space & time
5.3.3 A clear heterogeneity of crack development (CT images)
5.4 Discussion
5.4.1 boundary condition
5.4.2 Equation setup
5.4.3 Solution of pore pressure at different positions and time
5.5 Conclusions
Conclusions
References
