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- W604983669 abstract "This paper discusses the construction of the metro system in the southern area of Brasilia, the capital of Brazil. This system comprises a tunnel, two construction shafts, and nine stations. The tunnel is 6.8km long, 9.6m in diameter and 14.3m deep, and was constructed by the New Austrian Tunnelling Method (NATM), and the stations were excavated by cut and cover. The ground consists of porous clay, 8-40m thick over slate residual soils. The clay layer has large pores and is unstable and liable to structural collapse, causing deformations. The ground water is deep except for a short part of the route. The geotechnical properties of the clay were analysed by the University of Brasilia. The metro construction had the following main stages: (1) excavation; (2) placement of lattice girders 0.6-1.0m apart; (3) shotcreting the 210mm thick primary lining layer; and (4) placing the 200mm thick secondary lining layer and two layers of steel mesh. One full-face and three partial-face excavation methods were used; their choice depended on excavation and deformation conditions. The first was cheapest, and used where the face was stable and negligible damage to neighbouring structures was expected. More sensitive sections were excavated under a ground control regime without instability problems." @default.
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- W604983669 date "1999-01-01" @default.
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- W604983669 title "TUNNELLING IN POROUS SOILS FOR BRASILIA'S METRO" @default.
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