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Rock Mechanics and Rock Engineering

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01.01.2011 | Original Paper

The Effect of Consolidation on TBM Shield Loading in Water-Bearing Squeezing Ground

verfasst von: M. Ramoni, G. Anagnostou

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 1/2011

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Abstract

Jamming or overstressing of the shield due to ground pressure are potential problems for tunnel boring machine (TBM) tunnelling in squeezing ground. The risk of shield jamming depends essentially on the deformation rate of the ground in the vicinity of the working face. The time-dependency of the ground response to the excavation is associated with its rheological properties as well as with the transient consolidation process that takes place around the opening in the case of a low-permeability saturated ground. The present paper focuses on the second mechanism and investigates the interaction between the advancing shield, tunnel lining and consolidating ground by means of transient numerical analyses. For a given set of geotechnical conditions and a given TBM configuration, the load exerted by the ground upon the shield during TBM operation decreases with increasing gross advance rate. During a long break in operations, the ground pressure may increase significantly, thereby necessitating a higher thrust force to overcome shield skin friction and restart the TBM. It is interesting to note that a high advance rate reduces the risk of shield jamming not only during TBM advance, but is also favourable with respect to any subsequent long standstills.

Vorheriger Artikel The Interaction Between Shield, Ground and Tunnel Support in TBM Tunnelling Through Squeezing Ground

Nächster Artikel Analysis of Stochastic Seismic Wave Interaction with a Slippery Rock Fault

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Titel: The Effect of Consolidation on TBM Shield Loading in Water-Bearing Squeezing Ground
verfasst von: M. Ramoni
G. Anagnostou
Publikationsdatum: 01.01.2011
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 1/2011
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-010-0107-4

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