Journal
GEOTECHNIQUE
Volume 64, Issue 10, Pages 837-842Publisher
ICE PUBLISHING
DOI: 10.1680/geot.14.T.009
Keywords
deformation; field instrumentation; tunnels
Categories
Funding
- COST [TD1001]
- UK Engineering and Physical Sciences Research Council (EPSRC)
- Crossrail
- EPSRC [EP/G063486/1] Funding Source: UKRI
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Horizontal strains were measured with high precision during Crossrail tunnel excavation in central London by means of distributed fibre-optic sensors embedded in shallow transverse and longitudinal surface trenches. Validation of these measurements against manual micrometer stick readings demonstrates the benefits of the fibre-optic sensing: high precision at small strains; significantly smaller spatial resolution; and the possibility for automatised measurements over larger spans. In order to further capitalise on these advantages, two additional potential applications of the fibre-optic measurements were investigated: (a) independent assessment of the vertical ground displacements using transverse strain measurements and analytical settlement trough models; and (b) early prediction of the vertical and horizontal ground displacements, using transverse and longitudinal strain measurements and analytical settlement trough models. While understanding that a single case study can only form a basis for limited conclusions, both applications do appear to be feasible.
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