Book contents
- Geologic Fracture Mechanics
- Geologic Fracture Mechanics
- Copyright page
- Dedication
- Contents
- Preface
- Acknowledgements
- 1 Introduction to Geologic Structural Discontinuities
- 2 Elastic Rock Rheology and Stress Concentration
- 3 Stress, Mohr Circles, and Deformation at Peak Strength
- 4 Cracks and Anticracks
- 5 Discontinuity Patterns and Their Interpretation
- 6 Faults
- 7 Deformation Bands
- 8 Fracture Mechanics: A Tour of Basic Principles
- 9 Beyond Linear Elastic Fracture Mechanics
- Glossary
- References
- Index
- Answers to Selected Exercises
9 - Beyond Linear Elastic Fracture Mechanics
Published online by Cambridge University Press: 03 August 2019
- Geologic Fracture Mechanics
- Geologic Fracture Mechanics
- Copyright page
- Dedication
- Contents
- Preface
- Acknowledgements
- 1 Introduction to Geologic Structural Discontinuities
- 2 Elastic Rock Rheology and Stress Concentration
- 3 Stress, Mohr Circles, and Deformation at Peak Strength
- 4 Cracks and Anticracks
- 5 Discontinuity Patterns and Their Interpretation
- 6 Faults
- 7 Deformation Bands
- 8 Fracture Mechanics: A Tour of Basic Principles
- 9 Beyond Linear Elastic Fracture Mechanics
- Glossary
- References
- Index
- Answers to Selected Exercises
Summary
Geologic fracture mechanics (GFM) can be thought of as an interdisciplinary field combining approaches from engineering, materials science, and geology. It includes Linear Elastic Fracture Mechanics (LEFM) but relaxes some of the assumptions that are required for LEFM to apply to geologic structural discontinuities (i.e., fractures and deformation bands). LEFM is widely regarded as the most simple and restrictive special case of fracture mechanics (see discussions by Latzko, 1979; Kanninen and Popelar, 1985, p. 13; and Anderson, 1995, p. 117). Upon close examination, it may be seen that many of the predictions of LEFM do not match geologic observations as well as might be desired, suggesting the need for a more general approach that includes material from chemistry (to better consider diagenesis (Fig. 9.1) and subcritical fracture propagation) and plasticity (to better represent near-tip processes). Elements of some of these approaches are described in this chapter.
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- Geologic Fracture Mechanics , pp. 400 - 503Publisher: Cambridge University PressPrint publication year: 2019