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AN INNOVATIVE UNDERDROUND POWER SHEME Numerical Modeling

Discover an innovative hydroelectric scheme on a small island in Portugal through detailed numerical analyses with FEM models developed at the University of Porto. The scheme includes reversible units with a 450m elevation difference between upper and lower tunnels, featuring a 5.2km tunnel, storage gallery, cavern-pumped station, and auxiliary gallery. Explore geomechanical characterization of basalt and volcanic materials and FEM models for lower reservoir stages. Analyze structural behavior, settlements, and safety factors for optimized performance.

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AN INNOVATIVE UNDERDROUND POWER SHEME Numerical Modeling

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  1. AN INNOVATIVE UNDERDROUND POWER SHEME Numerical Modeling Bruno Correia Luis Leal L. Ribeiro e Sousa University of Porto, Portugal

  2. This presentation is related to an UPHS innovative hydroelectric scheme in a small island, Portugal. Also presents numerical analyses performed considering FEM models developed at University of Porto.

  3. The UPHS system is equipped with reversible units with a differential elevation of about 450m between an upper tunnel and a lower storage tunnel. • The repowering included the sequence of underground works: • 5.2km tunnel located at upper level • A gallery for storage with a total capacity of 40 000m3 • A cavern pumped station • An auxiliary gallery

  4. UPHS Scheme

  5. Upper reservoir • 5200 m • 40000 m3

  6. Lower reservoir • 1200 m • 40000 m3

  7. Pumped Station

  8. Auxilliary tunnel

  9. Geomechanical characterization • ZG1 • ZG2

  10. Lower reservoir

  11. Auxiliary tunnel

  12. Compact basalt Breccias Volcanic materials

  13. Stages • FEM models for lower reservoir • Phase2 – Rocscience • 4 stages

  14. 3 types of volcanic formations

  15. Conclusions

  16. Analysis of different shapes

  17. Total displacements

  18. Pumping station • High - 26 m; • width - 12 m; • length - 44 m

  19. FEM models • 11 stages

  20. Analysis of the structural behaviour

  21. Settlements at surface • Horizontal displacements at the walls

  22. Safety factor

  23. Generalized forces • a) N; b) T; c) M

  24. 3D model • Plaxis

  25. Upper tunnel

  26. 5200 m – single TBM

  27. Fall of basalt blocks

  28. Geometry

  29. Thank You

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