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

2. University of Porto UPHS. Numerical Modelling 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. University of Porto UPHS. Numerical Modelling 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 000m 3 –A cavern pumped station –An auxiliary gallery

4. University of Porto UPHS. Numerical Modelling

5. University of Porto UPHS. Numerical Modelling UPHS Scheme

6. University of Porto UPHS. Numerical Modelling Upper reservoir –5200 m –40000 m 3

7. University of Porto UPHS. Numerical Modelling Lower reservoir –1200 m –40000 m 3

8. University of Porto UPHS. Numerical Modelling Pumped Station

9. University of Porto UPHS. Numerical Modelling Auxilliary tunnel

10. University of Porto UPHS. Numerical Modelling Geomechanical characterization –ZG1–ZG2

11. University of Porto UPHS. Numerical Modelling Lower reservoir Túnelkm inicialkm finalExtensão (m) Frente 10+017,5000+473,000475,50 Frente 21+153,0001+536,000340,50 Frente 31+722,0002+598,000198 Frente 42+681,0003+406,50036,50 Frente 52+681,0003+406,500112 Frente 62+681,0003+406,50037,50 Total1200

12. University of Porto UPHS. Numerical Modelling Auxiliary tunnel

13. University of Porto UPHS. Numerical Modelling Volcanic materials Compact basaltBreccias

14. University of Porto UPHS. Numerical Modelling FEM models for lower reservoir –Phase 2 – Rocscience –4 stages Stages

15. University of Porto UPHS. Numerical Modelling 3 types of volcanic formations

16. University of Porto UPHS. Numerical Modelling Conclusions

17. University of Porto UPHS. Numerical Modelling Analysis of different shapes

18. University of Porto UPHS. Numerical Modelling Total displacements

19. University of Porto UPHS. Numerical Modelling Pumping station –High - 26 m; –width - 12 m; –length - 44 m

20. University of Porto UPHS. Numerical Modelling FEM models –11 stages

21. University of Porto UPHS. Numerical Modelling Analysis of the structural behaviour

22. University of Porto UPHS. Numerical Modelling –Horizontal displacements at the walls –Settlements at surface

23. University of Porto UPHS. Numerical Modelling Safety factor

24. University of Porto UPHS. Numerical Modelling Generalized forces –a) N; b) T; c) M

25. University of Porto UPHS. Numerical Modelling 3D model Plaxis

26. University of Porto UPHS. Numerical Modelling Upper tunnel

27. University of Porto UPHS. Numerical Modelling 5200 m – single TBM

28. University of Porto UPHS. Numerical Modelling Fall of basalt blocks

29. University of Porto UPHS. Numerical Modelling Geometry

30. University of Porto UPHS. Numerical Modelling Thank You