INTERNAL EROSION OF EXISTING DAMS, LEVEES AND DIKES, AND THEIR FOUNDATIONS / LâROSION INTERNE DANS LES BARRAGES ET DIGUES EN EXPLOITATION ET LEUR FONDATION

TABLE DES MATIRES

TABLEAUX & FIGURES

PRFACE ET REMERCIEMENTS

RSUM

1. GNRALITS

1.1 CE QUE DIT LE VOLUME 1 SUR LâROSION INTERNE

1.2 PROCESSUS DâROSION INTERNE

1.3 NEUF POINTS FUNDAMENTAUX DE LâROSION INTERNE

1.4 JUSTIFICATION DES NEUFS POINTS FONDAMENTAUX DE LâROSION INTERNE

1.5 UTILISER LA COMPRHENSION RCENTE DES MCANISMES DâROSION

2. TUDES DE CAS

2.1 LEONS APPRISES DES RUPTURES ET INCIDENTS

2.2 RUPTURES ET INCIDENTS DUS LâROSION DE CONDUIT

2.3 RUPTURES ET INCIDENTS DUS LâROSION RGRESSIVE LOCALE ET GLOBALE

2.4 RUPTURES ET INCIDENTS DâEROSION DE CONTACT

2.5 RUPTURES ET INCIDENTS DE SUFFUSION

2.6. RUPTURES VITES PAR DES FILTRES ROSION LIMITE OU IMPORTANTE ET AUTRES MATRIAUX DE REMBLAI

3. RECONNAISSANCES

3.1 PRINCIPES DâINVESTIGATION DE LâROSION INTERNE

3.2 CAROTTAGES POUR CHANTILLONS INTACTS SOUS LA NAPPE

3.3 DETECTION DES FUITES: MTHODES DIRECTES

3.4 DETECTION DES FUITES: MTHODES GOPHYSIQUES

4. ESSAIS DE LABORATOIRE

4.1 INTRODUCTION

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

ET DU COFFICIENT DâROSION (CE)

4.3 ESSAIS DE SUFFUSION

4.4 ESSAI DâROSION DE CONTACT

4.5 ESSAIS DE PERMABILIT, RODABILIT ET CAPACIT FILTRANTE DES REMBLAIS ET DES FILTRES

5. RHABILITATION

5.1 INTRODUCTION

5.2 RPARATION DE LâROSION DE CONDUIT

5.3 RPARATION DE LâROSION RGRESSIVE

5.4 RPARATION EN CAS DâROSION DE CONTACT

5.5 RPARATION EN CAS DE SUFFUSION

6. SURVEILLANCE

6.1 OBJECTIFS ET PRINCIPES DE LA SURVEILLANCE DDIE A LâROSION INTERNE

6.2 SURVEILLANCE ET AUSCULATION LONG TERM

6.3 PIZOMTRES, PRESSIONS ET GRADIENTS HYDRAULIQUES

6.4 DTECTION 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 âSOME-â AND âEXCESSIVE-â 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