Hygro‐thermo‐chemo‐mechanical modelling of shotcrete during tunnel advance. Issue 1 (17th December 2018)

• Record Type: Journal Article
• Authors: Gamnitzer, Peter; Schreter, Magdalena; Hofstetter, Günter
• Other Names: Müller G. guestEditor.; Ulbrich M. guestEditor.
• Is Part Of: Proceedings in applied mathematics and mechanics. Volume 18:Issue 1(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-17
• Subjects: Applied mathematics -- Periodicals; Engineering mathematics -- Periodicals; Mathematical physics -- Periodicals; 519
• DOI: 10.1002/pamm.201800144
• Languages: English
• ISSNs: 1617-7061

Abstract

Abstract: This contribution deals with numerical modelling of drill‐and‐blast tunnelling. Special attention is paid to the modelling of a shotcrete layer supporting the surrounding rock after excavation. Due to an increasing load caused by further tunnel advance, and due to shrinkage caused by hydration which is restrained by the surrounding rock, the shotcrete is loaded in place at a very early age. Hence it is required to accurately model the evolution of its strength and stiffness. This is done using a fully coupled hygro‐thermo‐chemo‐mechanical multi‐phase model for the shotcrete. Creep of shotcrete is taken into account using a microprestress‐solidification approach. The constitutive model for the shotcrete is calibrated using experimental data obtained from laboratory tests reported in literature. The setup for the tunnelling simulation is completed assuming elastic‐plastic response for the surrounding rock and the additional steel anchors. The results of this contribution are considered to be a further step towards a more accurate modelling of excavation procedures in conventional drill‐and‐blast tunnelling.