Model-based interpretation of undrained creep instability in loose sands

F. Marinelli, F. Pisanó, C. Di Prisco, Giuseppe Buscarnera

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Evidence shows that in the presence of extended stages of undrained creep, loose sands may approach liquefaction instabilities with a non-negligible time lag with respect to the application of loading. In this paper, a mechanical interpretation of such delayed failure events is provided by using stability criteria for rate-dependent materials. For this purpose, a viscoplastic constitutive law for sands has been calibrated to replicate delayed failure processes documented in the literature. To explain the origin of the transition from stable to unstable creep, the model predictions have been inspected from a mathematical standpoint and a strategy to evaluate the time required for the initiation of failure has been provided. The analyses show that the acceleration of the creep strains anticipates the sharp increase in the rate of pore water pressure, thus constituting a precursor to runaway failure. Furthermore, the computed stresses at which the two variables accelerate are located in proximity of the instability line for static liquefaction, with a shift from it that depends on the rate of loading prior to creep and the soil viscosity. These findings provide support to understand the interplay between rate-dependent soil properties and delayed liquefaction by offering a new conceptual platform to interpret the temporal evolution of flow failures observed under field or laboratory conditions.

Original languageEnglish (US)
Pages (from-to)504-517
Number of pages14
JournalGeotechnique
Volume68
Issue number6
DOIs
StatePublished - Jun 1 2018

Fingerprint

creep
Creep
Liquefaction
Sand
liquefaction
sand
Soils
Stability criteria
temporal evolution
soil property
porewater
viscosity
Viscosity
rate
prediction
Water
soil

Keywords

  • Creep
  • Deformation
  • Failure
  • Liquefaction
  • Plasticity
  • Pore pressures

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Marinelli, F. ; Pisanó, F. ; Di Prisco, C. ; Buscarnera, Giuseppe. / Model-based interpretation of undrained creep instability in loose sands. In: Geotechnique. 2018 ; Vol. 68, No. 6. pp. 504-517.
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Model-based interpretation of undrained creep instability in loose sands. / Marinelli, F.; Pisanó, F.; Di Prisco, C.; Buscarnera, Giuseppe.

In: Geotechnique, Vol. 68, No. 6, 01.06.2018, p. 504-517.

Research output: Contribution to journalArticle

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