Abstract
The two-phase instability of saturated elasto-plastic soils is investigated under plane strain conditions. This type of material instability is characterised by a non-homogeneous field of solid deformation with vortex-like patterns, which grows rapidly and is accompanied by a non-uniform flow of interstitial water exhibiting source-sink flow patterns. Three simple criteria are established to define the conditions for the onset of two-phase instability within elasto-plastic soils saturated with an incompressible fluid and subjected to plane-strain undrained loadings. The simplest criterion states that the onset of instability almost coincides with the peak deviator stress during undrained loading. This analysis shows that two-phase instability in elasto-plastic soils is different from strain localisation, strain softening and constitutive singularities. Two-phase instability is likely to emerge before shear bands in contractant elasto-plastic soils of the Mohr-Coulomb type. The study suggests that two-phase instability may disrupt numerical liquefaction analyses using elasto-plastic soil models, and thus prompts the need for further analytical and experimental investigations.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 389-398 |
| Number of pages | 10 |
| Journal | Geotechnique |
| Volume | 51 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jun 2001 |
| Externally published | Yes |
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Keywords
- Constitutive relations
- Liquefaction
- Numerical modelling
- Pore pressures
- Theoretical analysis
ASJC Scopus subject areas
- Earth and Planetary Sciences (miscellaneous)
- Geotechnical Engineering and Engineering Geology
Cite this
Plane strain instability of saturated elasto-plastic soils. / Iai, S.; Bardet, Jean-Pierre.
In: Geotechnique, Vol. 51, No. 5, 06.2001, p. 389-398.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Plane strain instability of saturated elasto-plastic soils
AU - Iai, S.
AU - Bardet, Jean-Pierre
PY - 2001/6
Y1 - 2001/6
N2 - The two-phase instability of saturated elasto-plastic soils is investigated under plane strain conditions. This type of material instability is characterised by a non-homogeneous field of solid deformation with vortex-like patterns, which grows rapidly and is accompanied by a non-uniform flow of interstitial water exhibiting source-sink flow patterns. Three simple criteria are established to define the conditions for the onset of two-phase instability within elasto-plastic soils saturated with an incompressible fluid and subjected to plane-strain undrained loadings. The simplest criterion states that the onset of instability almost coincides with the peak deviator stress during undrained loading. This analysis shows that two-phase instability in elasto-plastic soils is different from strain localisation, strain softening and constitutive singularities. Two-phase instability is likely to emerge before shear bands in contractant elasto-plastic soils of the Mohr-Coulomb type. The study suggests that two-phase instability may disrupt numerical liquefaction analyses using elasto-plastic soil models, and thus prompts the need for further analytical and experimental investigations.
AB - The two-phase instability of saturated elasto-plastic soils is investigated under plane strain conditions. This type of material instability is characterised by a non-homogeneous field of solid deformation with vortex-like patterns, which grows rapidly and is accompanied by a non-uniform flow of interstitial water exhibiting source-sink flow patterns. Three simple criteria are established to define the conditions for the onset of two-phase instability within elasto-plastic soils saturated with an incompressible fluid and subjected to plane-strain undrained loadings. The simplest criterion states that the onset of instability almost coincides with the peak deviator stress during undrained loading. This analysis shows that two-phase instability in elasto-plastic soils is different from strain localisation, strain softening and constitutive singularities. Two-phase instability is likely to emerge before shear bands in contractant elasto-plastic soils of the Mohr-Coulomb type. The study suggests that two-phase instability may disrupt numerical liquefaction analyses using elasto-plastic soil models, and thus prompts the need for further analytical and experimental investigations.
KW - Constitutive relations
KW - Liquefaction
KW - Numerical modelling
KW - Pore pressures
KW - Theoretical analysis
UR - http://www.scopus.com/inward/record.url?scp=0035382139&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035382139&partnerID=8YFLogxK
U2 - 10.1680/geot.51.5.389.39969
DO - 10.1680/geot.51.5.389.39969
M3 - Article
VL - 51
SP - 389
EP - 398
JO - Geotechnique
JF - Geotechnique
SN - 0016-8505
IS - 5
ER -