University of Porto UPHS. Numerical Modelling AN INNOVATIVE UNDERDROUND POWER SHEME Numerical...

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

University of Porto


• 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.

University of Porto


• 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

University of Porto


FUNCHAL

MACHICO

de

LOCALIDADE

APROVEITAMENTOS HIDROELÉCTRICOSDA REGIÃO AUTÓNOMA DA MADEIRA

University of Porto


• UPHS Scheme

University of Porto


• Upper reservoir– 5200 m– 40000 m3

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• Lower reservoir– 1200 m– 40000 m3

University of Porto


• Pumped Station

University of Porto


• Auxilliary tunnel

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• Geomechanical characterization

– ZG1 – ZG2

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• Lower reservoir

Túnel km inicial km final Extensão (m)

Frente 1 0+017,500 0+473,000 475,50

Frente 2 1+153,000 1+536,000 340,50

Frente 3 1+722,000 2+598,000 198

Frente 4 2+681,000 3+406,500 36,50

Frente 5 2+681,000 3+406,500 112

Frente 6 2+681,000 3+406,500 37,50

Total 1200

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• Auxiliary tunnel

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• Volcanic materials

Compact basalt Breccias

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• FEM models for lower reservoir– Phase2 – Rocscience– 4 stages

Stages

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• 3 types of volcanic formations

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• Conclusions

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• Analysis of different shapes

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• Total displacements

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

University of Porto


• FEM models

– 11 stages

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• Analysis of the structural behaviour

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– Horizontal displacements at the walls

– Settlements at surface

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• Safety factor

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• Generalized forces

– a) N; b) T; c) M

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• 3D model• Plaxis

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• Upper tunnel

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• 5200 m – single TBM

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• Fall of basalt blocks

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• Geometry

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• Thank You

University of Porto UPHS. Numerical Modelling AN INNOVATIVE UNDERDROUND POWER SHEME Numerical...

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