The void ratio dependency of the retention behaviour for a compacted clay

Farulla, Camillo Airò; Battiato, Andrea; Ferrari, Alessio

doi:10.1201/b10526-59

Cited by 16 publications

(10 citation statements)

References 1 publication

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“…For clayey materials, the characteristics that are usually quantified are the air entry value (value of suction at which the material starts to desaturate in a main drying episode) and its dependency on the void ratio [2], the residual degree of saturation and the hysteresis upon wetting and drying cycling [3]. For compacted clays, attention has also been paid to the effects of the evolution of the microstructure on retention behaviour [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…The limitation of the acquired information is even more evident when compared to the available experimental evidence on the retention behaviour of low-porosity compacted clays [3,11] and natural clays [12][13][14][15]. Schmitt et al [16] presented data on the retention behaviour of Tournemire shale (France), which was obtained from porosimetry tests along with data on two different sandstones highlighting the higher suction range that is needed for the shale in order to observe appreciable variations in the degree of saturation.…”

Section: Introductionmentioning

confidence: 99%

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Experimental analysis of the water retention behaviour of shales

Ferrari

Favero

Marschall

et al. 2014

International Journal of Rock Mechanics and Mining Sciences

104

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a b s t r a c tShales are among the most commonly considered geomaterials in current energy-related geomechanical investigations, as they are involved in engineering applications such as the extraction of natural gas, CO 2 sequestration and nuclear waste storage. A deep understanding of their behaviour with regard to variations in the degree of saturation is of significance for such applications. With the aim to establish a sound protocol for shale retention behaviour analysis, this paper presents an experimental methodology that takes into account the specificities of shales such as small pore size dimensions and the large variations in water potential to be applied to induce significant changes in the degree of saturation. The technique involves the direct control of the shale water content and the subsequent measurement of the suction at equilibrium by a psychrometer. A fluid displacement technique with a non-polar liquid is also used to assess the volume changes of the shale and to compute the degree of saturation. Selected test results are presented for various shale samples that have been cored at different depths. The results indicate that important features of the retention behaviour of geomaterials are fundamental aspects to be considered when analysing the retention behaviour of shales, such as the existence of main wetting and drying paths, the hysteresis domain, and the dependency of the air entry value on the void ratio.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the water retention behaviour of shales

Ferrari

Favero

Marschall

et al. 2014

International Journal of Rock Mechanics and Mining Sciences

104

View full text Add to dashboard Cite

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“…5d). In the first cycle, the reduction in w during the drying step is higher (in absolute value) than that of the phase of wetting, with a progressive reduction of w, as effect of the hydraulic hysteresis [14]. At the same time, despite the strong volumetric shrinkage, a reduction in the degree of saturation with the continuation of the cycles occurs (Figs.…”

Section: Results Analysismentioning

confidence: 90%

“…During the first cycle, the degree of saturation differences, at constant matric suction, are linked to the effect of the hydraulic hysteresis [14]. In subsequent cycles, the cyclical variations of degree of saturation is reduced a lot, although it should be noted a slight tendency to reduce the degree of saturation in the third and fourth round of drying (S r = -0.003).…”

Section: Results Analysismentioning

confidence: 99%

Suction controlled drying and wetting cycle effects on the volumetric behaviour of a lime-treated high plasticity clay

et al. 2016

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Abstract. The paper presents some experimental results collected on samples recovered from an experimental embankment obtained by compacting a lime-treated clay. Samples were collected soon after the in situ compaction and they were cured in controlled environmental conditions for at least 18 months. Mercury intrusion porosimetry tests (MIP) were carried out on freeze-dried specimens to characterize the microstructure of the material. In order to assess the durability of the improved material, laboratory tests focused on the effects of cyclic variations of the degree of saturation on the water retention properties and the volumetric behaviour of the stabilized clay. Collected results show that the lime-treated clay undergoes an almost irreversible volumetric behaviour; this irreversible contraction is associated to severe drying processes, while wetting paths do not produce significant volumetric deformations.

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“…This assumption, made in the interests of simplicity, neglects the air-occlusion value of suction, which is typically smaller than s air and is in contradiction with experimental evidence (e.g. Romero et al, 1999;Tarantino, 2009;Airo Farulla et al, 2010). However, as the same assumption holds for the relevant constitutive model within ICFEP (Georgiadis et al, 2005), which was employed in conjunction with the proposed developments, consistency is guaranteed.…”

Section: Modelling Of the Soil-water Retention Curve Formulationmentioning

confidence: 82%

A three-dimensional hysteretic soil-water retention curve

Tsiampousi¹,

Zdravković²,

Potts³

2013

Géotechnique

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A three-dimensional hysteretic soil-water retention curve A. TSIAMPOUSI Ã , L. ZDRAVKOVIĆ a nd D. M. P OTTS One of the most important features in unsaturated soil mechanics is the soil-water retention curve and its coupling to the mechanical component of soil behaviour. It has long been recognised that the retention curve exhibits significant hysteresis, and that it is affected by the specific volume. Several attempts have been made in the past to model this behaviour. A novel approach is proposed herein, which accounts for both the hydraulic hysteresis and the specific volume dependence of the retention relationship in a three-dimensional formulation. The primary and the scanning paths are simple geometric curves, which have a common tangent at the point of intersection, ensuring a smooth transition from scanning to primary paths. A small number of parameters are required to define the primary paths, and no fitting parameters are necessary for generation of the scanning paths. As knowledge of the specific volume and its variation is required, the retention model needs to be employed in conjunction with a constitutive model capable of reproducing the complex behaviour of unsaturated soils. To guarantee consistency with the retention model, the degree of saturation needs to be incorporated in the specific volume-suction relationship adopted within the constitutive model. To accommodate such a feature when absent, a new expression for the soil compressibility with suction as a function of the degree of saturation is proposed. Simulations of laboratory experiments on unsaturated soils, involving cyclic changes of applied suction, demonstrate the effectiveness of the proposed modelling approach.

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The void ratio dependency of the retention behaviour for a compacted clay

Cited by 16 publications

References 1 publication

Experimental analysis of the water retention behaviour of shales

Experimental analysis of the water retention behaviour of shales

Suction controlled drying and wetting cycle effects on the volumetric behaviour of a lime-treated high plasticity clay

A three-dimensional hysteretic soil-water retention curve

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