Construction method and methodology for the optimization of panels overlap in cut-off walls in Santa Maria Dam, Sinaloa

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Publication Title
Construction method and methodology for the optimization of panels overlap in cut-off walls in Santa Maria Dam, Sinaloa

Abstract
The Santa Maria Dam on the Baluarte River is a concrete face rockfill dam with a total height of 152 m from the rock stratum, located 32 m depth. Cofferdams will be constructed upstream and downstream. At the foundation of the upstream cofferdam, a cut-off wall has been constructed. Alluvial soils with rocky blocks generate difficulties on the verticality control of the cut-off walls. A combination of construction methods and instrumentation of the excavation avoids deviations of the bentonite cement diaphragm wall. A pre-excavation and fill with fine sand prevent deviations and improves the production yields in the construction of the diaphragm wall. A methodology for the optimization of panel overlap is defined based on the instrumentation of the panel verticality, during excavation works. The adoption of a conservative overlap is usual if there isn’t a detailed analysis of the site conditions. By the overlap optimization, it is improved the efficiency of the project, saving time and resources. The excavation of the adjacent primary panels and their deviations are independent events, their analysis allows defining a statistical distribution and the confidence interval for the overlap value.
Authors
Eloy Jimenez Ontiveros; F. J. Blanco Blanco; V. H. Olivera Luis

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

D - Current and new construction methods

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