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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
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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
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.
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 000m3
– A cavern pumped station
– An auxiliary gallery
University of Porto
UPHS. Numerical Modelling
FUNCHAL
MACHICO
de
LOCALIDADE
APROVEITAMENTOS HIDROELÉCTRICOSDA REGIÃO AUTÓNOMA DA MADEIRA
University of Porto
UPHS. Numerical Modelling
• UPHS Scheme
University of Porto
UPHS. Numerical Modelling
• Upper reservoir– 5200 m– 40000 m3
University of Porto
UPHS. Numerical Modelling
• Lower reservoir– 1200 m– 40000 m3
University of Porto
UPHS. Numerical Modelling
• Pumped Station
University of Porto
UPHS. Numerical Modelling
• Auxilliary tunnel
University of Porto
UPHS. Numerical Modelling
• Geomechanical characterization
– ZG1 – ZG2
University of Porto
UPHS. Numerical Modelling
• 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
University of Porto
UPHS. Numerical Modelling
• Auxiliary tunnel
University of Porto
UPHS. Numerical Modelling
• Volcanic materials
Compact basalt Breccias
University of Porto
UPHS. Numerical Modelling
• FEM models for lower reservoir– Phase2 – Rocscience– 4 stages
Stages
University of Porto
UPHS. Numerical Modelling
• 3 types of volcanic formations
University of Porto
UPHS. Numerical Modelling
• Conclusions
University of Porto
UPHS. Numerical Modelling
• Analysis of different shapes
University of Porto
UPHS. Numerical Modelling
• Total displacements
University of Porto
UPHS. Numerical Modelling
• Pumping station– High - 26 m; – width - 12 m; – length - 44 m
University of Porto
UPHS. Numerical Modelling
• FEM models
– 11 stages
University of Porto
UPHS. Numerical Modelling
• Analysis of the structural behaviour
University of Porto
UPHS. Numerical Modelling
– Horizontal displacements at the walls
– Settlements at surface
University of Porto
UPHS. Numerical Modelling
• Safety factor
University of Porto
UPHS. Numerical Modelling
• Generalized forces
– a) N; b) T; c) M
University of Porto
UPHS. Numerical Modelling
• 3D model• Plaxis
University of Porto
UPHS. Numerical Modelling
• Upper tunnel
University of Porto
UPHS. Numerical Modelling
• 5200 m – single TBM
University of Porto
UPHS. Numerical Modelling
• Fall of basalt blocks
University of Porto
UPHS. Numerical Modelling
• Geometry
University of Porto
UPHS. Numerical Modelling
• Thank You
