Retroanálise numérica da convergência de uma escavação subterrânea em rocha (caso estudo: TAJ UHE Simplício)
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2009-06-09
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Universidade Federal de Goiás
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Currently, the increasing demand for great workmanships in Brazil, had become an impediment for the development of Brazil. The Geotechnical Engineering is considered an
essential tool, in great workmanships (hydroelectric power plants, subways, tunnels, etc.) supplying technical support for design and construction. In this context, the underground
excavations in rock have increased too much. This work presents a study of the behavior of the closer of an underground excavation in rock, where it was considered as case study, Simplício hydroelectric power plant, located in the Paranaíba do Sul river, in frontiers of the States of Rio de Janeiro and Minas Gerais. By means of laboratory tests with samples of intact rock and survey mapping of discontinuities, was characterizes the rock mass. Establishing the principal geomechanic parameters and estimating the in-situ stress state of the rock mass, then was chose the geomechanical model and made a numerical simulation of the excavation process tunnel help downstream of tunnel 3. For the tunnel study was conducted a numerical axial analysis symmetry of the relaxation of the excavated mass on the distance from the face of excavation, to determine the moment of installation and simulate a support of the tunnel closer. For the carried out simulation, the rock mass behaved only in the
elastic range, finding closer the results of the simulation, the results on the field by monitoring the tunnel. It was observed that for the degree of alteration of the studied mass, the rupture could occur for the rock as well for the discontinuities, depending on the wedges formed for the discontinuities families and the support type applied in the rock mass
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VISSOTTO JÚNIOR, Lucas Alberto. Back-analysis numerical of convergence of underground escavation in rock (Case Study: TAJ UHE Simplicio). 2009. 199 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2009.