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  Analysis of a tunnel excavation in São Paulo Metro Line 5 Expansion in gneiss residual soil

  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, simulating the soil mechanical behavior through an elastic perfectly plastic constitutive model (Mohr Coulomb). Finally, some constructive details that can interfere with the settlements results will be evaluated, such as soil treatment, constructive sequence and dewatering.

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