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List of products by author: M. A. A. P. Silva
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Analysis of a tunnel excavation in São Paulo Metro Line 5 Expansion in gneiss residual soil
Abstract: A 139 m² tunnel excavation is analyzed, part of the Line 5 Extension of Companhia do Metropolitano de São Paulo (CMSP), excavated in gneiss residual soil, confronting instrumentation data with results from bidimensional analysis utilizing a numerical model with finite elements. The tunnel excavation was divided into three stages and the tunnel construction complete sequence is reproduced,...
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Challenges in a great diameter tunnel excavation in sandy soil
Abstract: An 84 m long conventional tunnel with 117 m² tunnel cross section is under constructed in layered soil, which ranges from sandy soil with high permeability to clayey soil with low permeability. High groundwater pressures in the excavation of the crown and invert have been experienced. The tunnel concept had a pre-support in Jet Grouting executed from surface. This solution allowed a faster...
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Design and construction aspects of a conventional shallow tunnel in very soft soil
Abstract: The Metro Line 5 Expansion is currently in progress in São Paulo/Brazil. It is a project that will connect the South area of the city to the city centre. There are 11 km of tunnels and 11 new stations under construction, including connections to the existent Line 1 Santa Cruz Station and Line 2 Klabin Station. Brooklin Station, part of the expansion, is located in a highly occupied area in São...
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Development of a new design for Metro Stations
Abstract: The concept for Brooklin Station consists of five circular intersecting shafts, with a diameter of 35m, 30m in depth, and a total excavation surface of 4250 m². Water control and management is fundamental as the entire Brooklin Station area is near a contaminated zone, making any dewatering process impossible to execute. Since the water level is near the surface, structural demand is also very...
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Key Aspects of Tunneling in Tropical Residual Soil
Abstract: Tropical residual soils present a real challenge regarding conventional tunneling. These soils are heterogeneous, with ever-changing face conditions, non horizontal stratification and a high sensibility to water content and transient conditions. At each excavation step the face conditions change, demanding a careful approach in terms of ground treatments and dewatering systems. The...
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Probabilistic Assessment of Tunnel Face Stability
Abstract: It is widely recognised within engineering practice that tunnelling is a science surrounded by uncertainties that range from the geotechnical parameters and design assumptions to the interpretation of the right ground responses during excavation. In an attempt to accommodate these inherent uncertainties both qualitative and quantitative risk assessment procedures have been employed in different...
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Segmental concrete tunnel lining design for two 6.9 m EPB TBM machines
Abstract: Precast segmental linings for shield driven tunnels are designed as both initial ground support and final tunnel lining in modern projects. The parameters of tunnel lining such as dimensions, thickness and strength of materials are related not only to ground-lining interaction, but also to construction conditions. In current case, both conventional steel cage and steel fiber reinforcement were...
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Twin tunnels excavated in sandy soils in a density urban area
Abstract: The Line 5 Extension is being the major government investment for the public transport in São Paulo/ Brazil. It will connect the São Paulo south area to its central area, with a whole extension of 11 kilometres, including 11 new stations. The first stretch consists of two single tunnels with 4 kilometres long each, which will be executed by two 6,86 m EPB Shields. The two machines will bore...
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