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Quantification of stress states in shotcrete shells

  • Jürgen Macht
  • Roman Lackner
  • Christian Hellmich
  • Herbert A. Mang
Chapter

Abstract

As reported in Chap. 3, monitoring of deformations which occur during the excavation of tunnels is essential for the success of the NATM. Nowadays it is performed at every NATM construction site. The combination of these monitored displacements with the material model for shotcrete outlined in Chap. 5 has led to the development of a hybrid method for the analysis of closed shotcrete tunnel shells by means of nonlinear Finite Element (FE) analyses. It allows determination of the stress state in the shotcrete shell. Knowing this stress state a level of loading can be computed, amounting to 0% for the unloaded shell and to 100% for shotcrete (locally) loaded up to its compressive strength. The analysis of segmented tunnel shells required further development of this hybrid method. The desire for real-time monitoring of the level of loading led to the development of a shell-theory-based hybrid method avoiding time-consuming FE analyses.

Keywords

Axial Force Hybrid Method Circumferential Direction Longitudinal Displacement Rock Bolt 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Wien 2003

Authors and Affiliations

  • Jürgen Macht
    • 1
  • Roman Lackner
    • 1
  • Christian Hellmich
    • 1
  • Herbert A. Mang
    • 1
  1. 1.Institute for Strength of MaterialsVienna University of TechnologyAustria

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