On the role of vegetation in earthquake induced landslides

Research output: Contribution to conferencePaper

Abstract

Breakage of vegetation (grasses, shrubs and trees) has been observed in past earthquake induced landslide events. But the role of vegetation during such occurrences has generally been overlooked due to the difficulty in quantifying the magnitude of the vegetation effect alone. In this paper, dynamic centrifuge testing has been conducted to investigate the seismic performance of a slope planted with vegetation. In the centrifuge modelling, 3-D printing of layered ABS plastic was used to produce repeatable root analogues which are highly representative of the geometry and mechanical behaviour of real woody root systems. The earthquake sequence was composed of three distinct motions to investigate the behaviour of the vegetated slopes under a sequence of strong motions (without intermediate reinstatement, e.g. aftershocks) and to provide a richer dataset concerning the dynamic response within the slope (e.g. more information on topographic amplification). It is shown that vegetated slopes performed better than the benchmark fallow slopes during earthquakes, especially in terms of the crest deformation response, which is a key parameter in performance-based slope assessment and design. However, vegetation had a very limited influence on the general propagation and amplification of the dynamic earthquake motion from the toe to the crest of the slope. Test results were then compared with other existing studies which considered slopes with similar geometry but reinforced by more traditional techniques (e.g. piles).
Original languageEnglish
Pages1-9
Number of pages9
Publication statusPublished - Jun 2016
Event1st International Conference on Natural Hazards & Infrastructure - Chania, Greece
Duration: 28 Jun 201630 Jun 2016
http://iconhic2016.com/

Conference

Conference1st International Conference on Natural Hazards & Infrastructure
CountryGreece
City Chania
Period28/06/1630/06/16
Internet address

Fingerprint

landslide
earthquake
vegetation
amplification
geometry
centrifugal model test
strong motion
centrifuge
breakage
dynamic response
root system
aftershock
fallow
pile
shrub
plastic
grass

Keywords

  • centrifuge modelling
  • earthquakes
  • landslides
  • vegetation

Cite this

Liang, T., Knappett, J. A., Bengough, A. G., & Muir Wood, D. (2016). On the role of vegetation in earthquake induced landslides. 1-9. Paper presented at 1st International Conference on Natural Hazards & Infrastructure, Chania, Greece.
Liang, Teng ; Knappett, Jonathan A. ; Bengough, Anthony, Glyn ; Muir Wood, David. / On the role of vegetation in earthquake induced landslides. Paper presented at 1st International Conference on Natural Hazards & Infrastructure, Chania, Greece.9 p.
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Liang, T, Knappett, JA, Bengough, AG & Muir Wood, D 2016, 'On the role of vegetation in earthquake induced landslides' Paper presented at 1st International Conference on Natural Hazards & Infrastructure, Chania, Greece, 28/06/16 - 30/06/16, pp. 1-9.

On the role of vegetation in earthquake induced landslides. / Liang, Teng (Lead / Corresponding author); Knappett, Jonathan A.; Bengough, Anthony, Glyn; Muir Wood, David.

2016. 1-9 Paper presented at 1st International Conference on Natural Hazards & Infrastructure, Chania, Greece.

Research output: Contribution to conferencePaper

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AB - Breakage of vegetation (grasses, shrubs and trees) has been observed in past earthquake induced landslide events. But the role of vegetation during such occurrences has generally been overlooked due to the difficulty in quantifying the magnitude of the vegetation effect alone. In this paper, dynamic centrifuge testing has been conducted to investigate the seismic performance of a slope planted with vegetation. In the centrifuge modelling, 3-D printing of layered ABS plastic was used to produce repeatable root analogues which are highly representative of the geometry and mechanical behaviour of real woody root systems. The earthquake sequence was composed of three distinct motions to investigate the behaviour of the vegetated slopes under a sequence of strong motions (without intermediate reinstatement, e.g. aftershocks) and to provide a richer dataset concerning the dynamic response within the slope (e.g. more information on topographic amplification). It is shown that vegetated slopes performed better than the benchmark fallow slopes during earthquakes, especially in terms of the crest deformation response, which is a key parameter in performance-based slope assessment and design. However, vegetation had a very limited influence on the general propagation and amplification of the dynamic earthquake motion from the toe to the crest of the slope. Test results were then compared with other existing studies which considered slopes with similar geometry but reinforced by more traditional techniques (e.g. piles).

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Liang T, Knappett JA, Bengough AG, Muir Wood D. On the role of vegetation in earthquake induced landslides. 2016. Paper presented at 1st International Conference on Natural Hazards & Infrastructure, Chania, Greece.