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Instabilities in alpine permafrost: strength and stiffness in a warming regime
von: Yuko Yamamoto
vdf Hochschulverlag AG, 2015
ISBN: 9783728136411 , 514 Seiten
Format: PDF, Online Lesen
Kopierschutz: Wasserzeichen
Preis: 74,99 EUR
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Instabilities in alpine permafrost: strength and stiffness in a warming regime
1
Imprint
4
Foreword
5
Acknowledgements
7
Contents
9
Kurzfassung
15
Abstract
17
1 Introduction
19
1.1 Motivation
19
1.2 Objectives of the thesis
22
1.3 Organisation of the thesis
24
2 Literature review
25
2.1 Permafrost
25
2.2 Frozen soil
40
2.3 Numerical modelling
74
2.4 Concluding remarks
79
3 Triaxial stress path tests
81
3.1 Introduction
81
3.2 Soil component
83
3.3 Triaxial testing equipment
85
3.4 Triaxial test programme
98
3.5 Axial compression: CRS tests
108
3.6 Axial compression: CSC tests
146
3.7 Axial extension: CRS tests
161
3.8 Lateral compression: CSR tests
170
3.9 Lateral extension: CSR tests
173
3.10 Discussion
179
3.11 Summary
188
4 Laboratory testing
191
4.1 Introduction
191
4.2 Triaxial tests in AC on unfrozen soil specimens
192
4.3 Three-point bending test
198
4.4 Four-point bending test
208
4.5 Determination of unfrozen water content
215
4.6 Determination of thermal conductivity
219
4.7 Micromechanical investigation
221
4.8 Summary
237
5 Synergistic learning from laboratory tests
239
5.1 Unfrozen water
239
5.2 Ductile and brittle behaviour
240
6 Numerical Modelling
249
6.1 Introduction
249
6.2 Governing equations
250
6.3 Input parameters
261
6.4 Soil model
269
6.5 Results
271
6.6 Summary
287
7 Summary, conclusions and recommendations
289
7.1 Summary and conclusions
289
7.2 Recommendations for future research
294
8 References
297
Appendix A: Results of CRS tests in axial compression
315
Appendix B: Results of CSC tests in axial compression
442
Appendix C: Results of CRS tests in axial extension
480
Appendix D: Results of CSR tests in lateral compression
498
Appendix E: Results of CSR tests in lateral extension
504