INTERNAL EROSION OF EXISTING DAMS, LEVEES AND DIKES, AND THEIR FOUNDATIONS / L’EROSION INTERNE DANS LES BARRAGES ET DIGUES EN EXPLOITATION ET LEUR FON (Paperback)

TABLE DES MATIERES

TABLEAUX & FIGURES

PREFACE ET REMERCIEMENTS

RESUME

1. GENERALITES

1.1 CE QUE DIT LE VOLUME 1 SUR L’EROSION INTERNE

1.2 PROCESSUS D’EROSION INTERNE

1.3 NEUF POINTS FUNDAMENTAUX DE L’EROSION INTERNE

1.4 JUSTIFICATION DES NEUFS POINTS FONDAMENTAUX DE L’EROSION INTERNE

1.5 UTILISER LA COMPREHENSION RECENTE DES MECANISMES D’EROSION

2. ETUDES DE CAS

2.1 LECONS APPRISES DES RUPTURES ET INCIDENTS

2.2 RUPTURES ET INCIDENTS DUS A L’EROSION DE CONDUIT

2.3 RUPTURES ET INCIDENTS DUS A L’EROSION REGRESSIVE LOCALE ET GLOBALE

2.4 RUPTURES ET INCIDENTS D’EROSION DE CONTACT

2.5 RUPTURES ET INCIDENTS DE SUFFUSION

2.6. RUPTURES EVITEES PAR DES FILTRES A EROSION LIMITEE OU IMPORTANTE ET AUTRES MATERIAUX DE REMBLAI

3. RECONNAISSANCES

3.1 PRINCIPES D’INVESTIGATION DE L’EROSION INTERNE

3.2 CAROTTAGES POUR ECHANTILLONS INTACTS SOUS LA NAPPE

3.3 DETECTION DES FUITES: METHODES DIRECTES

3.4 DETECTION DES FUITES: METHODES GEOPHYSIQUES

4. ESSAIS DE LABORATOIRE

4.1 INTRODUCTION

4.2 EROSION DE CONDUIT: MESURES DE LA CONTRAINTE CRITIQUE (TC)

ET DU COEFFICIENT D’EROSION (CE)

4.3 ESSAIS DE SUFFUSION

4.4 ESSAI D’EROSION DE CONTACT

4.5 ESSAIS DE PERMEABILITE, ERODABILITE ET CAPACITE FILTRANTE DES REMBLAIS ET DES FILTRES

5. REHABILITATION

5.1 INTRODUCTION

5.2 REPARATION DE L’EROSION DE CONDUIT

5.3 REPARATION DE L’EROSION REGRESSIVE

5.4 REPARATION EN CAS D’EROSION DE CONTACT

5.5 REPARATION EN CAS DE SUFFUSION

6. SURVEILLANCE

6.1 OBJECTIFS ET PRINCIPES DE LA SURVEILLANCE DEDIEE A L’EROSION INTERNE

6.2 SURVEILLANCE ET AUSCULATION A LONG TERM

6.3 PIEZOMETRES, PRESSIONS ET GRADIENTS HYDRAULIQUES

6.4 DETECTION DES FUITES

7. REFERENCES

TABLE OF CONTENTS

TABLES & FIGURES

FOREWORD AND ACKNOWLEDGEMENTS

EXECUTIVE SUMMARY

1. OVERVIEW

1.1 WHAT VOLUME 1 (ICOLD, 2017) TELLS US ABOUT INTERNAL EROSION

1.2 INTERNAL EROSION PROCESSES

1.3 NINE FUNDAMENTAL POINTS ABOUT INTERNAL EROSION

1.4 JUSTIFICATION OF THE NINE FUNDAMENTAL POINTS

1.5 USING THE NEW UNDERSTANDING OF INTERNAL EROSION MECHANICS

2. CASE HISTORIES

2.1 LESSONS FROM FAILURES AND INCIDENTS

2.2 FAILURES AND INCIDENTS FROM CONCENTRATED LEAK EROSION

2.3. FAILURES AND INCIDENTS FROM BACKWARD EROSION AND GLOBAL

BACKWARD EROSION

2.5. FAILURES AND INCIDENTS FROM SUFFUSION

2.6. FAILURE PREVENTED BY ‘SOME-’ AND ‘EXCESSIVE-’ EROSION FILTER

AND FILL MATERIALS IN EXISTING DAMS

3. INVESTIGATIONS

3.1 FUNDAMENTALS OF INTERNAL EROSION INVESTIGATIONS

3.2 DRILLING FOR COMPLETE GRANULAR SAMPLES BELOW WATER TABLE

3.3 LEAKAGE DETECTION: DIRECT METHOD

3.4 LEAKAGE DETECTION: GEOPHYSICAL METHODS

3.5 IN-SITU PERMEABILITY AND VELOCITY

4. LABORATORY TESTS

4.1 INTRODUCTION

4.2 CONCENTRATED LEAK EROSION: TESTS TO DETERMINE CRITICAL SHEAR STRESS (TC) AND COEFFICIENT OF EROSION (CE)

4.3 SUFFUSION TESTS

4.4 CONTACT EROSION TESTS

4.5 TESTS ON PERMEABILITY, ERODIBILITY AND FILTERING CAPABILITY OF FILLS AND FILTERS

4.6 CRACK EROSION TEST (CRET)

5. REMEDIATION

5.1 INTRODUCTION

5.2 REMEDIATION TO RESIST CONCENTRATED LEAK EROSION

5.3 REMEDIATION TO RESIST BACKWARD EROSION

5.4 REMEDIATION TO RESIST CONTACT EROSION

5.5 REMEDIATION TO RESIST SUFFUSION

6. SURVEILLANCE

6.1 SURVEILLANCE IN RELATION TO INTERNAL EROSION

6.2 LONG-TERM SURVEILLANCE AND MONITORING

6.3 PIEZOMETERS, PORE PRESSURES AND HYDRAULIC GRADIENTS

6.4 LEAKAGE DETECTION

7. REFERENCES