Rehabilitation of Gibbesi Dam

The dam on the Gibbesi torrent was built between 1969 and 1983, it is an earth structure with a vertical central core, immersed in a compact impervious clay base formation. The height of the dam is 30 m (L. 584/94); the volume is equal to 1,72 Mm3. The maximum quote of the reservoir is 231,50, the maximum level of regulation is 229,00 and the minimum level is 219,00. The crown, at an altitude of 236.00 m above sea level, is 607 m long and 8 m wide.

The project is about the seismic evaluation of the dam and of the structural works of the plant, study of the neutral pressures and of the filtration motions in the dam and in the banks, technical and economic feasibility, final and detailed design of the extraordinary maintenance of the connection road between the guard house and the sluice gate well, re-efficiency of the monitoring and control instrumentation of the dam and of the banks of the Gibbesi dam in the territory of the Municipality of Sommatino (CL) managed by the Sicilian Region.

The analyses consist in the seismic evaluation of the dam and ancillary works in the light of the technical standards for dams (NTD 2014) and the technical standards for construction (NTC 2018). 

The services provided are the following: evaluation of the seismic safety, the geotechnical study of the dam with the consequent definition of the interventions to improve its structural conditions, starting from the seismic verification and other related investigations. Interpretative study of neutral pressures and filtration motions in the dam and banks, technical and economic feasibility, final and detailed design of the road connecting the guardhouse to the sluice gates, re-efficient monitoring, and control instrumentation.

The proposed seismic upgrading interventions mainly concern the reinforced concrete works and include for the various works the execution of tie rods, piles, hooping, reinstatement of concrete covers.