Greenfield tunnelling in sands: the effects of soil density and relative depth
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Publication Date
2019-04Journal Title
Géotechnique
ISSN
0016-8505
Publisher
Thomas Telford Ltd.
Volume
69
Issue
4
Pages
297-307
Language
en
Type
Article
Metadata
Show full item recordCitation
Franza, A., Marshall, A., & Zhou, B. (2019). Greenfield tunnelling in sands: the effects of soil density and relative depth. Géotechnique, 69 (4), 297-307. https://doi.org/10.1680/jgeot.17.p.091
Abstract
<jats:p>Tunnel construction is vital for the development of urban infrastructure systems throughout the world. An understanding of tunnelling-induced displacements is needed to evaluate the impact of tunnel construction on existing structures. Recent research has provided insight into the complex mechanisms that control tunnelling-induced ground movements in sands; however, the combined influence of relative tunnel depth and soil density has not been described. This paper presents data from a series of 15 plane-strain centrifuge tests in dry sand. The cover-to-diameter ratio, C/D, of the tunnels ranges between 1·3 and 6·3, thereby including relatively shallow and deep tunnels. The sand relative density varies between 30 and 90%, corresponding to loose and dense soils. The effects of C/D, soil density and volume loss on vertical and horizontal soil movements, shear strains and ground reaction curves are discussed. Analysis of surface and subsurface settlement trough characteristics shows that the mechanisms are non-linear and the effects of soil relative density and volume loss on deformation patterns are highly dependent on C/D. The role of soil arching in the definition of the displacement mechanisms and a discussion of the implications of the results to the assessment of damage to existing structures are also provided.</jats:p>
Keywords
arching, centrifuge modelling, sands, settlement, tunnels
Sponsorship
This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) [1296878, EP/N509620/1].
Funder references
Engineering and Physical Sciences Research Council (EP/N509620/1)
Engineering and Physical Sciences Research Council (EP/I019308/1)
Engineering and Physical Sciences Research Council (EP/K000314/1)
Engineering and Physical Sciences Research Council (EP/L010917/1)
Engineering and Physical Sciences Research Council (EP/N021614/1)
Identifiers
External DOI: https://doi.org/10.1680/jgeot.17.p.091
This record's URL: https://www.repository.cam.ac.uk/handle/1810/280476
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