Thạc Sĩ Assessment of Shearing Phenomenon and Porosity of Porous Media Using Microfocus Computed Tomography

TABLE OF CONTENTS
DEDICATION ii
ACKNOWLEDGEMENTS . iii
ABSTRACT . vi
CHAPTER ONE: INTRODUCTION . 1
1.1 BACKGROUND 1
1.2 OBJECTIVES . 2
1.3 THESIS OUTLINE . 3
CHAPTER TWO: LITERATURE REVIEW . 4
2.1 X-RAY COMPUTED TOMOGRAPHY 4
2.1.1 History 4
2.1.2 Radiography versus CT 4
2.1.3 The Interaction of x-ray with Matter and CT Number 6
2.1.4 Applications of Microfocus Computed Tomography 9
2.1.5 The Development of CT Scanners . 10
2.1.6 Artifacts in CT . 13
2.2 APPLICATIONS OF CT IN THE STUDY OF POROSITY AND FABRIC OF
POROUS MEDIA . 14
2.2.1 Density Calibration of CT Data . 14
2.2.2 Using CT for Porosity Measurements 15
2.2.3 The Behavior of Granular Particles during Shearing . 17
CHAPTER THREE: PARTICLES BEHAVIOR DURING SHEARING OF
GRANULAR MATERIALS 19
3.1 INTRODUCTION 19
3.2 EXPERIMENTAL WORK . 19
3.3 VIEWING THE CT IMAGES AND DATA COLLECTION 25
CHAPTER FOUR: RESULTS AND DISCUSSION . 40
4.1 RESULTS . 40
4.1.1 Translation and Rotation 40
4.1.2 Local Strains 44
4.1.3 Dilatancy Angles 48
4.2 DISCUSSION OF RESULTS . 48
4.2.1 Translation . 48
4.2.2 Rotation 51
4.2.3 Local Strains 52
4.2.4 Dilatancy Angles 53
CHAPTER FIVE: SPATIAL POROSITY DISTRIBUTION OF ROCK CORES
STUDIED BY àCT 55
v
5.1 INTRODUCTION 55
5.2 EXPERIMENTAL WORK . 55
5.2.1 Specimen Description 55
5.2.2 CT Scanning . 57
5.3 POROSITY CALCULATIONS . 59
5.3.1 Density Calibration 59
5.4 RESULTS AND DISCUSSION . 61
5.4.1 Effect of Grain Size Distribution . 61
5.4.2 Effect of Compaction Pressure 64
5.4.3 Vertical Profiles of Porosity . 68
CHAPTER SIX: CONCLUSIONS AND RECOMMENDATIONS . 70
6.1 CONCLUSIONS . 70
6.2 RECOMMENDATIONS 72
REFERENCES . 73
APPENDIX A: TRANSLATION AND ROTATION HISTOGRAMS . 76
APPENDIX B: LOCAL STRAIN HISTOGRAMS . 78
VITA . 82