Geo-tubes are geosynthetic tubular containers, of various length and diameter, which are filled by pumping a fluid mixture of water and soil: the permeability of the geosynthetic allows water to drain rapidly so that at the end of the installation a solid nucleus is obtained. Considering that geo-tubes have been widely used as submerged elements, for example for shoreline protection, and that the filling material is a low density loose soil, hydraulically deposited, they may be subjected to liquefaction during seismic events. In order to investigate the behavior of a single submerged geo-tube when subjected to soil liquefaction, a numerical analysis is presented. The El Centro earthquake was considered and, under this solicitation, a rapid buildup of the pore pressure in the filling soil was observed. Consequently, since the first seconds of the seismic event, a decrease of the effective vertical stress took place up to values close to zero, showing the capability of the model to replicate a condition of soil liquefaction. At this stage, a general increase of the tensile force in the geosynthetic was noted, up to values that are significantly higher than those experienced in the static phase.

Numerical analysis of a geo-tube subjected to seismic soil liquefaction

Pavanello P. G.
;
Carrubba P.;
2019

Abstract

Geo-tubes are geosynthetic tubular containers, of various length and diameter, which are filled by pumping a fluid mixture of water and soil: the permeability of the geosynthetic allows water to drain rapidly so that at the end of the installation a solid nucleus is obtained. Considering that geo-tubes have been widely used as submerged elements, for example for shoreline protection, and that the filling material is a low density loose soil, hydraulically deposited, they may be subjected to liquefaction during seismic events. In order to investigate the behavior of a single submerged geo-tube when subjected to soil liquefaction, a numerical analysis is presented. The El Centro earthquake was considered and, under this solicitation, a rapid buildup of the pore pressure in the filling soil was observed. Consequently, since the first seconds of the seismic event, a decrease of the effective vertical stress took place up to values close to zero, showing the capability of the model to replicate a condition of soil liquefaction. At this stage, a general increase of the tensile force in the geosynthetic was noted, up to values that are significantly higher than those experienced in the static phase.
2019
Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering
978-0-367-14328-2
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3307320
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 0
social impact