Setec managed the entire reinforcement project, from preliminary studies to acceptance of the works:
– Preliminary studies and initial project assessment
– Analyses and calculations prior to draining the forebay
– Building permit application and authorization procedures
– Coordination with key actors
– Tender documentation and evaluation
– Construction supervision and monitoring
– Acceptance of the works
The works included:
– Cleaning cavities using dredging excavators
-Implementing a sheet pile wall structure for the deepest cavities
– Filling cavities with fiber-reinforced concrete
– Boreholes and injections of self-compacting concrete
HYDROCOP
Oct 2018 - Sept 2019
France
The Mathay Dam is a gravity dam built in 1912 for hydroelectric power generation purposes. The dam was later raised by installing 13 new valves (4 m high and 180 m wide).
Following an underwater inspection carried out by the Client in July 2018, major scouring at the downstream toe along the entire length of the dam were discovered, which called into question its stability. setec was tasked with managing the urgent and critical reinforcement project.
The dam safety was a major issue:
– Setec recommended draining the forebay prior to conducting technical and environmental follow-ups
– The work was carried out using floating pontoons to avoid leaning on the unstable structure of the dam. Vibrations and movements were monitored, and alert thresholds were implemented
during the reinforcement process.
