Temporary cofferdam at Caniçada Dam, Portugal
Temporary cofferdam at Caniçada Dam, Portugal
The execution of the Caniçada dam new complementary spillway, demanded the construction of a temporary cofferdam to allow the excavation of the discharge tunnel, at the dam south side. The cofferdam with about 20m height and 135m length, intersected weathered to very weathered granite, granite residual soils, fills and sands, with medium average hydraulic conductivity. This scenario led to the execution of a hybrid cofferdam solution: 7m concrete gravity wall over a 30m maximum depth cut-off curtain, using micropiles (tube à manchette) combined with 1m diameter, spaced 0.70m, double row jet grouting columns. The main design and execution criteria are presented, as well as the main QC/QA procedures.
Alexandre Pinto; Laura Caldeira; F. Cerqueira; N. Plasencia; F. Gomes
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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