LE BARRAGE FAIT PEAU NEUVE
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1 LE BARRAGE FAIT EAU NEUVE 02 février 2016
2 1 Context 2 reliminary studies 3 Numerical Modelling 4 Rehabilitation works
3 CONTEXT
4 HISTORY : Building LE BARRAGE FAIT EAU NEUVE
5 THE CRACKS 1963: The SC takes possession of the bimont Dam Only 3 years after Malpasset disaster Numerous cracks observed on the second plot and on the right bank of the dam Cote 329,50 m NGF LE BARRAGE FAIT EAU NEUVE
6 Cote 329,50 m NGF
7 THE CRACKS The geology was first suspected. Numerous fields of investigations: Complementary geological studies Gallery cutted into the rock foundation of the second cantilever Additionnal monitoring instruments: 2 plumblines, fissurometers, Topographic survey Mapping of the cracks network Several numerical models A geological cause of the damages was rejected LE BARRAGE FAIT EAU NEUVE
8 THE CRACKS
9 LE BARRAGE FAIT EAU NEUVE
10 16 cm ~ 3 cm 14 cm
11 RELIMINARY STUDIES
12 LE BARRAGE FAIT EAU NEUVE RELIMINARY STUDIES
13 RELIMINARY STUDIES The investigations showed internal cracks into the seven cantilevers of the rights banks A 1 B C D E 5 F 6 G 7 H 8 B28 B1 B8 B7 B3 340 B27 B10 B2 B42 B4 B51 B B43 B5 B13 B B6 B11 B16 B30 B B9 B15 B14 B B21 B18 B20 B31 B Légende : Droite verticale jaune : limite de plot Droite horizontale jaune : courbe de niveau Zone hachurée blanche : zone de gonflement du béton Zone avec une bordure blanche : zone d extension probable de la fissure de feuilletage oint orange : fissure (cumul <10) oint rouge gros : fissure (cumul >10) oint vert : pas de fissure ou microfissure B26 B19 B24 B LE BARRAGE FAIT EAU NEUVE
14 LAST LABORATORY TEST Electron microscope, energy dispersive X-ray spectrometer resence of massive secondary ettringite resulting from an internal sulphate reaction. LE BARRAGE FAIT EAU NEUVE
15 LAST LABORATORY TEST Test performed during 106 weeks to assess the residual expansion of concrete samples taken into sane concrete and swelling concrete. LE BARRAGE FAIT EAU NEUVE
16 NUMERICAL MODELLING
17 A B Barrage de Bimont H 1 G 7 C D E F 10 juin Zones de gonflement 300 TRACTEBEL
18 A B Barrage de Bimont C D E F G H 10 juin Zones de gonflement 300 TRACTEBEL
19 A B Barrage de Bimont C D E F G H 10 juin Réseau de fissures visibles 300 TRACTEBEL
20 A B Barrage de Bimont C D E F G H Downstream View: Swelling zones Cracks Open construction joints
21 DAM AND FOUNDATION MESHES
22 SWELLING MODELISATION Isotropic thermal equivalence g g t SCAS model (Stress Controlled Anisotropic Swelling) : g i F F i 0 F F i gl i i gl 1 L i with i=1, 2, 3 If i L (high compression), if i 0 (tension), si 0 i L σ i ε i (µm/m/an) 2
23 Dérives (en mm) Dérives (en mm) STRESS CONTROL ANISOTROIC SWELLING LAW (SCAS) WITH σ L = 5 Ma, ε GL = M/M/Y ε GL varying from 1,4 to 2,7 mm/m Δz crête (en mm) Comparaison des Δz crête de nivellement calculés Crest elevation drift lots SWELLING MODELISATION 2 3 Auscultation Gonf σl = 5 Ma ε = σl = 4 Ma ε = σl = 4 Ma ε = σl = 3.5 Ma ε = Tangential drift Dérives tangentielles Auscultation 5 Radial drift Dérives radiales Auscultation Gonf Gonf σl = 5 Ma ε = σl = Ma ε = σl = 4 Ma ε = σl = Ma ε = σl = 5 Ma ε = σl = 4 Ma ε = σl = 4 Ma ε = σl = 3.5 Ma ε = lots lots
24 DAM RESENT STATE RWL= 329 Deformations Swelling zones Open joints
25 Downstream face / parement aval rincipal stresses / contraintes principales 2 5 DAM RESENT STATE RWL= 329 Without swelling With swelling
26 DAM RESENT STATE RWL= 329 Interpretation Joints opening Swelling zones Internal crack Horizontal crack Vertical crack 2
27 DAM RESENT STATE RWL= 329 Internal cracking surface As observed As simulated 2
28 REHABILITATION WORKS
29 REHABILITATION ROJECT Cracks grouting Construction joints grouting Upstream face watertightning RB thrust block reinforcement Drainage curtain
30 Cracks grouting: why? Avoid application of pore pressure on internal cracks surface allow the arch stresses to be transmitted in the dam body «half «dam US Hydrostatic pressure Internal cracks
31 REHABILITATION ROJECT Cracks grouting Identified risks otential extension of cracks under grouting pressure ossibility to eject the concrete part between the internal crack and dam faces due to grouting pressure
32 REHABILITATION ROJECT Cracks grouting Technical solutions Temporary reinforcement with passive horizontal anchors Systematic inspection of all drillings by camera Cement grouting process bottom up Grouting pressures carefully monitored en reduced surfaces (4 x 4 m) - Automatic topographic surveillance
33 Cracks grouting : passive anchors implementation REHABILITATION ROJECT
34 Construction joints grouting REHABILITATION ROJECT
35 US face watertighting REHABILITATION ROJECT
36 Drainage curtain in the foundation REHABILITATION ROJECT
37 LANNING 1 Water by-pass implementation Reinforcement of monitoring system Reservoir emptying Rehabilitation works Reservoir refilling 2019 LE BARRAGE FAIT EAU NEUVE
38 Galerie de la Campane Transit par la retenue Conduite de dérivation et les vidanges Les travaux préparatoires : la dérivation vidange Branche de Marseille Nord 21/11/2017
39 LE BARRAGE FAIT EAU NEUVE HASE 1
40 LA RENOVATION DU DISOSITIF D AUSCULTATION 3 nouveaux télépendules, inversés
41 5 téléfissuromètres LA RENOVATION DU DISOSITIF D AUSCULTATION 7 cellules de pression interstitielle
42 LA RENOVATION DU DISOSITIF D AUSCULTATION LE BARRAGE FAIT EAU NEUVE
43 THANK YOU FOR YOUR ATTENTION
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