Geomechanics and Engineering

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Parametric study of the convergence of deep tunnels with long term effects: Abacuses

  • Quevedo, Felipe P.M. (Department of Civil Engineering Federal University of Rio Grande do Sul) ;
  • Bernaud, Denise (Department of Civil Engineering Federal University of Rio Grande do Sul)
  • Received : 2017.07.27
  • Accepted : 2018.01.06
  • Published : 2018.07.20
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Abstract

The objective of this paper is to present abacuses obtained from a parametric study of deep-lined tunnels using a numerical finite element model. This numerical model was implemented in software GEOMEC91, which is a two-dimensional axisymmetric model that considers the progress of excavation and the placing of the lining through the activation and deactivation of elements. It is adopted a step of excavation constant (1/3 of radius), constant velocity and circular cross section along the tunnel axis. It is used for rock mass a viscoplastic constitutive law with von-Mises criterion of viscoplasticity without hardening whose deformation rate over time is given by the Bingham model. The lining uses a linear elastic constitutive law. In total are 1716 analysis presented in 60 abacuses that show the value of ultimate convergence ($U_{eq}$) due to tunneling speed. In addition, it is shown an example of the use of the abacuses to determine the ultimate convergence ($U_{eq}$) of the tunnel and pressure ($P_{eq}$) on the lining.

Keywords

References

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