On the use of the generalised effective stress in the constitutive modelling of unsaturated soils

Laloui, Lyesse; Nuth, Mathieu

doi:10.1016/j.compgeo.2008.03.002

Cited by 88 publications

(53 citation statements)

References 18 publications

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“…This relation corresponds to the Bishop effective stress (Bishop, 1959;Schrefler, 1984) that is most suitable for the modelling of the behaviour of soils under saturated and unsaturated conditions (Nuth and Laloui, 2008;Laloui and Nuth, (Laloui et al, 2003): incompressible solid grains as well as water phase, compressible gas phase, perfect fluids and the phase separation concept.…”

Section: Momentum Balancementioning

confidence: 99%

Identification of mechanisms for landslide type initiation of debris flows

Klubertanz

Laloui

Vulliet

2009

Engineering Geology

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The modelling of debris flow initiation in slopes is addressed in this paper. First, possible factors governing debris flow initiation are established. Then, a coupled hydro-mechanical model for deformable porous media with two pore fluids that is used to assess the problem of the debris flow initiation in slopes is briefly outlined. Various ways to identify failure and to approach the transition of the failed mass into a debris flow are discussed in the framework of small strain theory and elasto-plastic behaviour. A parametric study was carried out to evaluate the relative importance of the most commonly cited parameters that are assumed to influence debris flow initiation. It was found that the slope angle is of minor importance in the development of slope instability under loading due to internal water supply. Transient behaviour was found to be decisive, and some critical combinations of water supply over time yielded situations that were likely to encourage the onset of debris flow. The significant role of permeability as a function of the degree of saturation in relation to the water supply is demonstrated. The proposed three-phase model is shown to be an adequate and promising way to address debris flow initiation.

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Section: Momentum Balancementioning

confidence: 99%

Identification of mechanisms for landslide type initiation of debris flows

Klubertanz

Laloui

Vulliet

2009

Engineering Geology

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“…Existing extensions of it are known under the name ACMEG (advanced constitutive model for environmental geomechanics; Laloui et al, 2010). They can cope with partial saturation (Laloui & Nuth, 2009), thermoplasticity for saturated soil (Laloui & François, 2009) and unsaturated soils (François & Laloui, 2008), and double-structured geomaterials (Koliji et al, 2010), among other variables.…”

Section: Constitutive Frameworkmentioning

confidence: 99%

An experimental and constitutive investigation on the chemo-mechanical behaviour of a clay

Witteveen

Ferrari

Laloui³

2013

Géotechnique

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An experimental and constitutive investigation on the chemo-mechanical behaviour of a clay P. WITTEVEEN Ã , A. F ERRARI Ã a nd L. LALOU I Ã Engineering issues for which the understanding of the chemo-mechanical behaviour of soils is relevant include wellbore stability problems, the salinification of groundwater, and nuclear waste storage. However, despite the vast number of situations in which couplings between chemistry and mechanics occur, the available constitutive models rely on limited experimental evidence. This paper presents the results of an experimental programme on the chemo-mechanical behaviour of a non-swelling illite. The osmotic suction is controlled through the ion concentration of sodium chloride in the pore water. Stress paths include mechanical loading at a constant osmotic suction, and an increasing osmotic suction at a constant mechanical stress. The experimental results point out a correlation between the osmotic suction and initial oedometric modulus, as well as between the osmotic suction and yield stress. A constitutive framework for soils is extended to take the observed chemo-mechanical couplings into account. The numerical model has been calibrated for the illite using the parameters obtained through the tests under mechanical loading at a constant concentration, and validated using more elaborate stress paths. The presented experimental and constitutive investigation builds a basis for the assessment of engineering issues in which pore liquid chemistry plays a major role.

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“…To deduce the value of the effective stress is not possible, without an additional assumption on the effective stress definition, as for example the Bishop's effective stress. Besides, it is useful to mention that some authors as Laloui and Nuth (2009) proposed a generalized effective stress concept versus Bishop's effective stress. These authors discussed the limitation of the last definition, in the elastoplastic framework of unsaturated soil.…”

Section: Introductionmentioning

confidence: 99%

“…It is also useful to mention that the strong assumption of BBM model, is to consider the suction as a hardening parameter. This has been revised later by some authors (Laloui & Nuth, 2009; Laloui, 2008). Also, with the BBM model, the yield surface evolves with the level of suction in a reversible manner.…”

Section: Approach To Model Slope Response To Rainfallmentioning

confidence: 99%

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Analysis of slope movement initiation induced by rainfall using the Elastoplastic Barcelona Basic Model

Jamei

Guiras

Olivella

2015

European Journal of Environmental and Civil Engineering

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In some arid and semi-arid regions, different types of infrastructure assets suffer from degradation of the roads, the embankment failures, erosion due to cyclic hydraulic actions and the effects of rainfall infiltration on slopes. Typical cases, such as the national roads in the north-west of Tunisia (Béja city) have been affected dramatically. Recent landslide is manifested in this region, especially in a plastic clay soil. Stability problems are caused by soil saturation and the presence of abundant cracks which are developed after a long dry summer. In fact, due to geotechnical problems, the annual loss due to the damage is estimated at $1 million in Béja area (30 km 2 ). The effect of rainfall infiltration into the unsaturated clay during wet seasons characterised by either long duration low intensity rain or short duration high intensity rain have been analysed. The elastoplastic Barcelona Basic Model (BBM) has been used and soil movements leading to slope failure were calculated according to the unsaturated state evolution. The effects of cyclic hydraulic paths on the yield function have also been investigated. The yield function evolution depends on the cohesion and the apparent consolidation stress variations. The numerical calculations were evaluated against the field measurement displacements.

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On the use of the generalised effective stress in the constitutive modelling of unsaturated soils

Cited by 88 publications

References 18 publications

Identification of mechanisms for landslide type initiation of debris flows

Identification of mechanisms for landslide type initiation of debris flows

An experimental and constitutive investigation on the chemo-mechanical behaviour of a clay

Analysis of slope movement initiation induced by rainfall using the Elastoplastic Barcelona Basic Model

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