Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

Numerical simulation of soil-support interaction as basis for the day-to-day decision process in NATM tunnel excavations

Yvonne Spira*, Roman Lackner, Herbert A. Mang
Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13/202, A-1040 Vienna, Austria

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In this paper, the soil-support interaction for tunneling processes according to the New Austrian Tunneling Method (NATM) is investigated by means of plane-strain numerical simulations. The studies performed encompass different types of soil (cohesive and granular) and two types of support means (shotcrete lining and jet-grouted soil). As regards the latter, the early-age behavior of the cement-based components is taken into account by means of a coupled chemomechanical approach. The obtained results provide insight into the benefits gained from the employed support means during NATM tunneling in different geological conditions, serving as the basis in the day-to-day decision process at NATM construction sites.

Keywords:  Tunneling; NATM; Soil; Shotcrete; Jet grouting; Chemomechanics; Soil-structure interaction

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