Stability slopes study of dams of Necaxa Hidroelectric System

Nicolás Melchor-García, Roberto Ruedas-Medina

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: In order to evaluate the structural behaviour and to obtain the safety factors of dams of the Necaxa hydroelectric system was carried out an analysis of slope stability using numerical models. The field work consisted of topography and bathymetry to characterize geometrically the dams. To obtain the mechanical properties of the material dams, geotechnical exploration was performed through permeability tests, standard penetration tests and recovery of samples and one-dimensional consolidation tests, triaxial tests and index test. Once constructed the models were applied methods of analysis and limit equilibrium method for pseudostatic seismic analysis. To review the effect of piping was carried out chemical analysis of water in the reservoirs. The results led to recommendations on the structural conditions of dams.

RESUMEN: Con el fin de evaluar el comportamiento estructural y obtener los factores de seguridad de las presas que integran el S.H. de Necaxa se llevo a cabo un análisis de estabilidad de taludes utilizando modelos numéricos. Los trabajos de campo consistieron en levantamiento topográfico y batimétrico para caracterizar geométricamente la cortina. Para obtener las propiedades mecánicas de los materiales que conforman los diques se realizó una exploración geotécnica, a través de pruebas de permeabilidad, pruebas de penetración estándar y recuperación de muestras, así como pruebas de consolidación unidimensional, ensayes triaxiales y pruebas índice. Una vez construidos los modelos se aplicaron métodos de análisis de equilibrio límite y un método pseudoestático para el análisis sísmico. Para revisar el efecto de tubificación se llevó a cabo análisis químico del agua de los embalses y vertedores de filtración. Los resultados permitieron dar recomendaciones sobre las condiciones estructurales de las presas.

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Cite this article:
Nicolás Melchor-García; Roberto Ruedas-Medina (2011) Stability slopes study of dams of Necaxa Hidroelectric System in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper881,author = Nicolás Melchor-García; Roberto Ruedas-Medina ,title = Stability slopes study of dams of Necaxa Hidroelectric System,year = 2011}