Grouting treatment design in foundation and abutments of La Yesca Hydroelectric Project

J.A. López-Molina, J.A. Valencia-Quintanar, J.A. Espinosa-Guillén

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Embankments and Dams

ABSTRACT: : The embankment structure of La Yesca Hydroelectric Project is integrated by a 220 m high Concrete Face Rock Fill Dam, founded over igneous rock of heterogeneous structure and properties. Due to the abutments complex geology and the underground structures that must be protected of seepage, a series of nine adits have been designed for continuing the grouting treatment from the Plinth. Considering as reference the previous studies on the zone, next subjects are presented: the preliminary criteria for treatment, the results obtained during construction stage so far, the design adjustments and the evaluation of this design under an observational and iterative methodology, based on information analysis generated before, during and after rock mass grouting.

RESUMEN: : La estructura de contención del Proyecto Hidroeléctrico La Yesca, la integra una cortina de enrocamiento con cara de concreto de 220 m de altura, desplantada sobre rocas ígneas de estructura y propiedades heterogéneas. Debido a la compleja geología de los empotramientos y las estructuras subterráneas que deben ser protegidas del embalse, se han proyectado una serie de nueve galerías que darán continuidad a los tratamientos mediante inyecciones desde el Plinto. Tomando como referencia los estudios previos de la zona, se presentan: los criterios elegidos preliminarmente para la ejecución de los tratamientos, los resultados obtenidos hasta la fecha durante la etapa de construcción, las adecuaciones realizadas al diseño y la evaluación de éste bajo una metodología observacional e iterativa, que se basa en el análisis de la información generada antes, durante y después de la inyección del macizo rocoso.

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Cite this article:
J.A. López-Molina; J.A. Valencia-Quintanar; J.A. Espinosa-Guillén (2011) Grouting treatment design in foundation and abutments of La Yesca Hydroelectric Project in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper884,author = J.A. López-Molina; J.A. Valencia-Quintanar; J.A. Espinosa-Guillén ,title = Grouting treatment design in foundation and abutments of La Yesca Hydroelectric Project ,year = 2011}