Is Matric Suction a Stress Variable?

Lu, Ning

doi:10.1061/(asce)1090-0241(2008)134:7(899)

Cited by 116 publications

(57 citation statements)

References 14 publications

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“…The suction stress, p s , which depends on capillary inter particle and van der Waals attraction forces, electrical double-layer repulsion, and ionic bonds formed between the soil particles is considered as a material characteristic (Lu, 2008). Due to the collapse potential of the loess, and its complicated deformation behavior, it is quite difficult to define trends between suction stress and the soil suction for this type of soil and a soil-specific experimental testing approach may be useful to examine the available choices of relationships for p s for loessial collapsible soils.…”

Section: Introductionmentioning

confidence: 99%

Hydro-mechanical behavior of undisturbed collapsible loessial soils under different stress state conditions

Garakani

Haeri

Khosravi

et al. 2015

Engineering Geology

102

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Section: Introductionmentioning

confidence: 99%

Hydro-mechanical behavior of undisturbed collapsible loessial soils under different stress state conditions

Garakani

Haeri

Khosravi

et al. 2015

Engineering Geology

102

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“…This up-scaling function includes all the interactions between air and water pressures with solids including the contractile skin forces as well as other physical mechanisms as the van der Waals forces. When the action of suction on the solids is the only factor to be considered, this upscaling function equals Bishop's parameter v. In the present paper, the product of Bishop 0 s parameter multiplied by suction (vs) is called suction stress as proposed by Lu (2008).…”

Section: Introductionmentioning

confidence: 94%

“…In a recent work Lu (2008) shows that suction has to be multiplied by an up-scaling function to be considered as a stress variable. This up-scaling function includes all the interactions between air and water pressures with solids including the contractile skin forces as well as other physical mechanisms as the van der Waals forces.…”

Section: Introductionmentioning

confidence: 99%

A four elements porous model to estimate the strength of unsaturated soils

et al. 2009

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One of the most prevalent relationships for effective stresses on unsaturated soils was proposed by Bishop in the middle of the last century. However, only recently Bishop's effective stress equation has been implemented in various constitutive models for unsaturated soils. These models have the advantage of naturally including the hydromechanical coupling that has been experimentally observed on these materials. Unfortunately, the problem of properly evaluating Bishop's parameter v still remains unsolved. This paper presents the results of a solid-porous model used to determine the value of Bishop's parameter v and evaluate the strength of unsaturated soils. These theoretical results are compared with a series of triaxial test performed on a silty sand subjected to different suctions in wet and dry paths. These comparisons show that the porous model proposed herein can be used to estimate the strength of unsaturated soils for both the wetting and the drying paths.

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“…We also note that stress and suction have the same unit, which is why the two variables can sometimes be added together through dimensionless multiplies (v, S r or 1). In this context, the argument that suction is physically not a stress variable [50] is not particularly pertinent.…”

Section: Stress and Strain Variablesmentioning

confidence: 99%