Structure Degradation of Dry Aggregated Soils: Experimental Evidence and Model Formulation

Koliji, Azad; Vulliet, L.; Laloui, L.

doi:10.1061/40802(189)184

Cited by 3 publications

(3 citation statements)

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“…The material behaviour inside this yield limit is elastic. Moreover, it is assumed that soil elastic properties are not affected by the structure [15]. Therefore, the elastic behaviour of the aggregated soil is modelled using the reconstituted soil model and elastic properties of the reconstituted soil.…”

Section: Pre-yield and Elastic Behaviourmentioning

confidence: 99%

New basis for the constitutive modelling of aggregated soils

2008

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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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Section: Pre-yield and Elastic Behaviourmentioning

confidence: 99%

New basis for the constitutive modelling of aggregated soils

2008

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“…The analogy observed between the curves validates the results of the tests performed at PSI. Figure 2 clearly reveals the existence of structure-induced apparent preconsolidation (see Koliji et al 2006 for further details). The observed yield limit is, in general, a function of soil fabric and inter-particle bonding which are two components of soil structure (Mitchell 1993).…”

Section: Mechanical Loadingmentioning

confidence: 99%

Experimental Study of Flow and Deformation in Aggregated Soils using Neutron Tomography

Koliji

Carminati

Kaestner

et al. 2006

Advances in X‐ray Tomography for Geomaterials

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“…Aggregates were collected from a clay-loam forest (Koliji et al 2006) and exposed to ambient air for two weeks. Then, three aggregates were placed into a cylindrical container in a way that the aggregates were in contact.…”

Section: Neutron Radiographymentioning

confidence: 99%