River dyke failure modeling under transient water conditions (eBook)

Wilmer Ferney Morales Peñuela (Autor)

eBook Download: PDF

2015 | 1. Auflage
436 Seiten
vdf Hochschulverlag AG
978-3-7281-3675-6 (ISBN)

Infos

Knowledge of the performance of river dykes during flooding is necessary when designing governmental assistance plans aimed to reduce both casualties and material damage. This is especially relevant when floods have increased in their frequency during the last decades, together with the resulting material damage and life costs. Most of previous attempts for analyzing dyke breaching during flooding have neglected to consider the soil mechanics component and the influence of infiltration and saturation changes on the failure mechanisms developed in the river dyke. This research project aimed to fill that gap in knowledge by analyzing, in a comprehensive manner, the effect of transient water conditions, represented by successive flood cycles, on the seepage conditions and subsequent breaching of dykes. Therefore, three key sub-projects were carried out: the analysis of the results from an overflow field test, the physical modeling of small-scaled models under an enhanced gravity field, the numerical modeling of the flow response and the resulting stability of both the air- and water-side slopes. The results from the numerical simulations matched accurately with the results obtained with the centrifuge modeling, including the prediction of local instabilities during the flood cycles for those dykes that did not include a toe filter.

Inhalt

Centrifuge modelling of ground improvement for double porosity clay 1
Imprint 4
Foreword 5
Acknowledgments 7
Contents 9
Kurzfassung 15
Abstract 17
1 Introduction 19
1.0 Motivation 19
1.1 Context of research 20
1.2 Aims, methodology, and structure of the study 21
2 Literature review 23
2.0 The challenge: landfills and ground improvement 23
2.1 Double porosity soil 29
2.2 Mining waste landfills in the Czech Republic 37
2.3 Centrifuge modelling 42
3 Laboratory testing 55
3.0 Material 55
3.1 Parameter tests 55
3.2 Mini centrifuge tests 57
3.3 Material preparation method for large centrifuge tests 63
3.4 Oedometer testing to establish effect of saturation ratio on onedimensional compression 66
3.5 Summary 71
4 Centrifuge testing 73
4.0 Introduction 73
4.1 Series 1: Scoping tests 89
4.2 Series 2: Embankments 116
4.3 Series 3: Sand compaction piles (SCPs) 134
4.4 Series 4: Dynamic compaction 169
4.5 Discussion of centrifuge modelling challenges 195
5 Discussion 199
5.0 Introduction 199
5.1 Implications for the soil structure 199
5.2 Foundation tests 207
5.3 Effect of ground improvement measures 211
5.4 Performance in practice - recommendations 215
6 Conclusions and outlook 217
6.0 Summary of experimental conclusions 217
6.1 Outlook and recommendations 220
7 References 223
8 Appendix 0: Lists of Figures and Symbols 229
8.0 List of Figures 229
8.1 List of Symbols 239
9 Appendix 1: Data plots 240
9.0 Series 1 240
9.1 Series 2 243
9.2 Series 3 246
9.3 Series 4 256
9.4 Chapter 5 261
10 Appendix 2: Positions of PPTs after centrifuge tests 264
Curriculum Vitae 267

Produkt-Details

• Erscheint lt. Verlag: 1.11.2015
• Reihe/Serie: Veröffentlichungen des Instituts für Geotechnik (IGT) der ETH Zürich
• Verlagsort: Zürich
• Sprache: englisch
• Themenwelt: Technik ► Architektur
• Themenwelt: Technik ► Bauwesen
• Schlagworte: Bruchmechanismus • Hochwasserschutz • Rhone • Überlauf
• ISBN-10: 3-7281-3675-1 / 3728136751
• ISBN-13: 978-3-7281-3675-6 / 9783728136756