Estudo de caso da execução de um túnel do Contorno Sul da Rodovia Nova Tamoios, região da Serra do Mar em São Sebastião- SP

• Autor(a) principal: Coutinho, Maísa Helena [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155183; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-04-11/000880160.pdf
• topic: Tuneis - Projetos e construção; Escavação; Parque Estadual da Serra do Mar (SP); Excavation

This work was divided into two parts, the first one develops the literature review and the second one, discuss the case study of the tunnel 301. The literature review covers the aspects that influence the excavation process. The main factor that affects a tunnel excavation is the geology of the area, because it allows: to know the types of soil and rock and the degree of change; to check for fractures, their fill, their position in relattion to the excavation direction; and to know the water level position. The identification of mass physical characteristics is done through geotechnical investigations. The obtained parameters are used in methods to calculate indices, that allow classifying the mass, proposing specific treatments for each class. There are several methods of geomechanics classification, but this work will discuss only the most used internationally and in Brazil, as the RMR systems and Q-system Barton. The classification and characterization are critical as they help in predicting mass behavior due to excavation and to choose the excavation methods, the support systems and the most adequate treatment. With the characterization of the mass and the project of the tunnel section, its possible to define excavation methods and equipments. This work will present the most widely used methods for road tunnel construction, putting emphasis on the NATM and Drill and Blast, as it was applied in the case study. After the excavation, the tunnel section receives stabilization treatments, through support application as lattice girder, staggered rock bolt, wire mesh and shotcrete, treated in item support systems. To observe the mass behavior after the excavations, its used instrumentation equipment. Its installation precedes the start of the excavation process and persists even after the end of the construction, but with longer ... ( Complete abstract click electronic access below)