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| Titel |
Soil liquefaction: a competition between buoyancy forces and ground acceleration |
| VerfasserIn |
Renaud Toussaint, Menka Stojanova, Cécile Clément, Einat Aharonov, Gustavo Sanchez, Ernesto Altshuler, Knut Jørgen Måløy, Eirik Grude Flekkøy |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084811
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| Zusammenfassung |
| When seismic waves travel through certain soils, these can lose resistance to shear,
and become liquid-like: they display a thixotropic behavior. The buildings and
structures lying on them can then subside, or sink partly in the soild, while mud
volcanoes are formed around pipes and cracks where the liquefied soil exits. We show
how a simple criterium considering the density of the solid part of the soil, the
density of the fluid and the horizontal peak ground acceleration (PGA) can render for
the main mechanical characteristics of the soil with respect to liquefaction, and
categorize this behavior between: (a) solid like behavior, (b) liquefaction, (c) complete
convection.
Using hybrid numerical simulations, taking into account both the presence of the fluid
and a granular behavior for the solid bulk composing the soil, we confirm this simple
analytical criterion. We also show it using saturated shaken experiments with a controlled
amplitude and frequency, and different type of granular densities and fluid saturation profile.
We show that the liquefaction effect is maximum when the top of the water table is close to
the surface. We show that these simulations confirm the analytical criterion, to a
large extent, apart from small deviations at slow frequencies and large vibration
amplitudes, more prone to liquefaction than the high frequency vibrations with a similar
PGA. |
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