NDLI: Time-dependent ground movements induced by shield tunneling in soft clay: a parametric study

Content Provider	Springer Nature Link
Author	Cattoni, Elisabetta Miria, Chiara Boco, Laura Tamagnini, Claudio
Copyright Year	2016
Abstract	In this work, the effects of coupled hydromechanical (consolidation) processes associated with shield tunneling excavation in soft clays are investigated with particular attention to the prediction of ground movements at the ground surface. A series of 2d FE analyses have been carried out in parametric form in order to investigate the effects of tunnel excavation velocity relative to the soil consolidation rate and the hydraulic boundary conditions at the tunnel boundary. The shield advancement process has been simulated with a simplified procedure incorporating both volume loss and ovalization of the tunnel section. In order to investigate the relative importance of soil consolidation during the excavation process, different characteristic times for the tunnel face advancement and for the consolidation process around the tunnel have been considered, for the two limiting conditions of fully permeable liner and impervious liner. The potential damage induced by the tunnel excavation on existing structures, based on computed ground surface distortions and horizontal deformations, has been found to vary significantly with time during the consolidation process. The results of the simulations allowed to obtain useful information on the minimum tunnel face advancement speed for which the assumption of fully undrained conditions for the soil during the excavations is acceptable, as well as on the speed range for which solving the fully coupled hydromechanical problem is necessary.
Starting Page	1385
Ending Page	1399
Page Count	15
File Format	PDF
ISSN	18611125
Journal	Acta Geotechnica
Volume Number	11
Issue Number	6
e-ISSN	18611133
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-03-31
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dimensional analysis Finite element modeling Hydromechanical coupling Shield tunneling Tunneling-induced building damage Geoengineering, Foundations, Hydraulics Continuum Mechanics and Mechanics of Materials Geotechnical Engineering & Applied Earth Sciences Soil Science & Conservation Soft and Granular Matter, Complex Fluids and Microfluidics Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Geotechnical Engineering and Engineering Geology

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