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Rock Mechanics and Rock Engineering

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27-02-2016 | Original Paper

Ground Response to Tunnel Re-profiling Under Heavily Squeezing Conditions

Authors: Apostolos Vrakas, Georgios Anagnostou

Published in: Rock Mechanics and Rock Engineering | Issue 7/2016

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Abstract

This paper presents a finite strain theoretical analysis of the ground response around highly deformed circular tunnel cross sections that are subjected to (repeated) re-profiling in order to re-establish the desired clearance. Plane strain axially symmetric conditions are considered, with linearly elastic, perfectly or brittle plastic rock behaviour according to the non-associated Mohr–Coulomb model. On the basis of this theoretical analysis, some practical questions are addressed with respect to the ground response curve, the maximum rock pressure (as carried by a practically rigid new temporary support) and the maximum wall convergence (as expected in the presence of a light new support) after re-profiling. Finally, the paper revisits the question of the effectiveness of a pilot tunnel with respect to the ground response during enlargement of the tunnel cross section.

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Title: Ground Response to Tunnel Re-profiling Under Heavily Squeezing Conditions
Authors: Apostolos Vrakas
Georgios Anagnostou
Publication date: 27-02-2016
Publisher: Springer Vienna
Published in: Rock Mechanics and Rock Engineering / Issue 7/2016
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-016-0931-2

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