This paper deals with the computation of the geomechanical parameters of the basaltic foundation of Aqua Vermelha concrete dam, from the deformation measurements of the multiple position rod extensometers and joint measurement devices. These extensometers were installed in the beginning of the construction period, thus allowing the computation of the deformation moduli of different rock layers and the normal stiffness moduli of a major joint with silt or clay infilling between two basaltic lava flows, during the construction of the dam.

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