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Design of The Gallery

Design of The Gallery. Van Cotthem Alain. Specific design challenge. Hydraulic Seal. End plug (rock load). crossing structure. Lining (rock load). Lining (heat load). Crossing. Feasibility to start without large convergences Stability of the opening. A : crossing structure.

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Design of The Gallery

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  1. Design of The Gallery Van Cotthem Alain

  2. Specific design challenge Hydraulic Seal End plug (rock load) crossing structure Lining(rock load) Lining (heat load) Tractebel Engineering

  3. Crossing • Feasibility to start without large convergences • Stability of the opening A : crossing structure Tractebel Engineering

  4. Crossing Tractebel Engineering

  5. Crossing Tractebel Engineering

  6. Crossing Tractebel Engineering

  7. Lining Design Diam interne 1.9 Diam externe 2.5 Tractebel Engineering

  8. Lining Design •  Béton C80/95 • Module de Young E = 50 GPa •  Dilatation thermique α = 1,9.10-5 fcd = 43,6 MPa coefficient partiel de sécurité sur le béton fabriqué en usine => γm = γc = 1,3  : coefficient de sécurité additionnel du fait de la moindre ductilité du béton non armé => γn = 1,2 Coefficient permettant de tenir compte des effets à long terme => α = 0,85 Tractebel Engineering

  9. Lining Design : Classical Loading •  • Stress anisotropy • 2.5 Mpa/2.75 Mpa in current section • 2.5 Mpa/3.5 Mpa close to the crossing • Curvature reduction effect • y’’ = M / (E.I) • Thick tube effect • d = 2 . Re / ( Re + Ri ) – 1 • Placement excentricity 2 cm • etot = M/N + 0,02 • Chamfers 2 cm • Boring (6 cm) • Key segment (shorter) • thermique Tractebel Engineering

  10. Lining Design : Classical Loading •  Tractebel Engineering

  11. + 90° Lining Design : Thermal Loading •  Stress increases from 43 Mpa to 110 Mpa Δσ= E * α * Δ T Difficult to count on clay divergence > In search of a elasto plastic material to absorb heat stress Tractebel Engineering

  12. Lining Design : Thermal Loading •  Tractebel Engineering

  13. Lining Design : Thermal Loading •  Tractebel Engineering

  14. Lining Design : Thermal Loading 5-6 mm of deformation between 35 MPa and 50 MPa of stress Panel thickness should be 50 mm after pressing and 75 mm before pressing The exterior of the parts should be coated so that foreign debris (sand) cannot enter Panel dimensions should be 300mm x 250mm Tolerances on all dimensions +/- 2mm Density should be 23% to 25% before pressing •  Tractebel Engineering

  15. Lining Design : Thermal Loading - High strength concrete Additional experiment is made with no compressible steel foam •  Tractebel Engineering

  16. Longitudinal stresses – end plug Tractebel Engineering

  17. Polysiloxane plates between each rings Grooves Longitudinal stresses – Longitudinal heat loading Tractebel Engineering

  18. Hydraulic Seal Temporary lining Tractebel Engineering

  19. Hydraulic Seal Final stainless steel lining Tractebel Engineering

  20. Hydraulic Seal Tractebel Engineering

  21. Hydraulic Seal Tractebel Engineering

  22. Thank you Tractebel Engineering

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