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  K0 Parameter Influence In Tunneling Superficial Settlements and in Liner Stresses

  This paper describes the influence of the k0 parameter (ratio between vertical and horizontal "in situ" stresses) in superficial settlements and liner stresses caused by NATM tunnel excavation in a residual soil massif in São Paulo Line 4 Yellow Subway expansion. Are presented two-dimensional numerical analyses using Finite Diferences Method implemented in FLAC software, for the construction method simulation. The soil behavior is simulated by Linear Elastic model with Mohr-Coulomb envelope.

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