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research article

New basis for the constitutive modelling of aggregated soils

Koliji, Azad  
•
Vulliet, Laurent  
•
Laloui, Lyesse  
2008
Acta geotechnica

Natural and compacted soils are usually characterized by aggregation of particles. The mechanical behaviour of these materials depends on soil structure. The oedometric compression tests performed on aggregated samples presented here showed that these materials exhibit a yield limit depending not only on stress history and stress state but also on soil structure. Evidence is provided using the neutron tomography technique. These results revealed that soil structure modification occurs together with plastic deformations. The experimental results are used to propose a new state parameter to quantify the soil structure. Based on pore-scale experimental observations, an evolution law for this parameter is proposed as a function of associated plastic strains. Considering both soil fabric and inter-particle bonding effects, a new yield limit depending on stress state, stress history and soil structure is introduced for the aggregated soils. Accordingly, a new constitutive framework consistent with strain hardening plasticity is proposed to consider soil structure effects in the modelling of aggregated soils.

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Type
research article
DOI
10.1007/s11440-007-0052-x
Web of Science ID

WOS:000207721900007

Author(s)
Koliji, Azad  
Vulliet, Laurent  
Laloui, Lyesse  
Date Issued

2008

Publisher

Springer-Verlag

Published in
Acta geotechnica
Volume

3

Start page

61

End page

69

Note

National Licences

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMS  
Available on Infoscience
January 31, 2008
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/17368
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