The figure shows the relationship between how the water pressure in the tunnel (blue line) and the pore pressure in various places in the rock (red, purple and green line) increase at different rates when the water flow in a power tunnel is shut off. The areas where the pore pressure exceeds the water pressure in the tunnel (yellow areas) are periods of hydraulic stress = periods of increased stress and risk of collapse in the tunnel.

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Project information

Project name:
Long-term impact on unlined tunnels of hydropower plants due to frequent start/stop sequences 

Duration:
2017-2021

Work Package in HydroCen:
Hydropower structures

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Publications

Handbooks and tools

VIDEO & WEBINARS

IN THE NEWS

Newsletter from HydroCen

Contact

Project information

Project name:
Long-term impact on unlined tunnels of hydropower plants due to frequent start/stop sequences 

Duration:
2017-2021

Work Package in HydroCen:
Hydropower structures

Partners

Publications

Handbooks and tools

VIDEO & WEBINARS

IN THE NEWS

Newsletter from HydroCen