NUMERICAL-ANALYSES OF TUNNEL LININGS BY MEANS OF A VISCOPLASTIC MATERIAL MODEL FOR SHOTCRETE

This paper is concerned with the parameter identification, verificatio n and selected applications of a 3D viscoplastic material model for sh otcrete proposed by Meschke.(1) The performance of the shotcrete model is evaluated by means of reanalyses of short-term and creep tests on shotcrete specimen. The most essential items of a viscoplastic cap mod el used for the representation of soil including the determination of the model parameters are also presented. Both models are employed in a 3D finite element simulation of the excavation of a single-track tunn el driven according to the New Austrian Tunnelling Method. Comparisons between in situ measurements and numerical results are presented.