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  Dewatering for construction of São Paulo Metro - Line 5 extension: comparison of design predictions with monitored results

  The excavation of shafts and tunnels in urban area often occurs under the groundwater table. The choice of dewatering for construction (deep excavation) remains a challenging and highly risk task in densely populated urban areas. The solution of dewatering involves a series of evaluations about: i) the choice of dewatering method (well point, deep pumps, etc.) and the dimensioning of the system; ii) a risk analysis (instability of the excavation, transport of fines and risk of settlement-induced damages to the nearby buildings and pipelines); iii) safety factor due to piping and heaving. In this paper it is shown the approach to dewatering adopted by Geodata for both the design and the construction of the Line 5 of the Metro of Sao Paulo (Brazil).

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