Volume change behaviour of clays: the influence of mineral composition, pore fluid composition and stress state

Maio, Caterina Di; Santoli, Livio de; Schiavone, Peter

doi:10.1016/s0167-6636(03)00070-x

Cited by 204 publications

(91 citation statements)

References 24 publications

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“…3). Similar compressibility results were found by other authors for reconstituted materials (Di Maio et al, 2004;Wahid et al, 2011). Further tests are required to check the validity of the results for compacted and structured materials.…”

Section: Oedometer Testssupporting

confidence: 85%

Unsaturated Soils: Research and Applications

2012

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Section: Oedometer Testssupporting

confidence: 85%

Unsaturated Soils: Research and Applications

2012

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“…Compacted clay soil is preferred because it is low-cost and provides leachate treatment with high ef iciency [21,22]. Although the compacted clay soils have many superiorities like low permeability (< 10 −9 m/s), they have instability problems because of their potential of high shrinkage and expansion [22,23,24]. According to the design criteria of Turkish Solid Waste Management Legislation, the liner component is compacted to provide a hydraulic conductivity no greater than 10 −9 m/s [25].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of clay soils’ permeability: A comparative study between the natural, compacted, and consolidated clay soils

2017

J. adv. tec. eng. res.

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“…A similar influence of pore fluid salinity is expected for natural clays where the smectite minerals constitute a significant part of the clay mineral content as discussed in section 3.1.4. The results from a number of studies are summarised in figure 3.10, (Di Maio 1996;Di Maio et al 2004;Grønbech et al 2010;Geertsema and Torrance 2005). The figure illustrates the decrease of the liquid limit when obtained using pore fluid with increasing salinity, based on a range of tests performed on natural clays.…”

Section: Effects Of Pore Water Chemistry On Consistency Limits and Dementioning

confidence: 99%

Influence of smectite content on the deformation behaviour of clay

Lodahl¹

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A number of structures are planned to be constructed on or in the Palaeogene clays in Denmark, e.g. the re-development of Aarhus Ø and the construction of the Femern Fixed Link. The Palaeogene clays are generally of very high plasticity, hold low strengths and have high deformation potentials despite being previously compressed by past glaciations. When unloaded the clay adsorbs water and swells profoundly. These geotechnical traits pose a challenge and must be accounted for when designing a structure situated on high plasticity clays. When not considered, the features of the Palaeogene clay may pose a safety concern for the building and settlements may develop over time.Previous studies on Palaeogene clays in Denmark have shown, that the well-known index relations used in Danish geotechnical practice are generally not valid for the in situ behaviour of high plasticity clays. Moreover, several studies illustrates how the vertical yield stress derived from the compression curves of high plasticity clays does not reflect the previously sustained overburden, which normally is the case for clays of low to medium plasticity. The feature have been described as "lack of stress memory".The present thesis investigates the 1D deformation behaviour of high plasticity clays. The effects of the clay mineral smectite on the deformation and swelling potential of the high plasticity clays are of special focus. Based on 1D compression tests the deformation potential of a range of artificial specimens made from mixtures of kaolinite and smectite minerals were investigated. Features typically observed for Danish Palaeogene clays were also observed for the artificial mixtures, e.g. high plasticity and low stiffness, which have both been related to the smectite content in the tested, artificial specimens.Based on a number of tests, conducted following different loading programmes, a deformation model framework is presented which captures the essential features of the high plasticity clays. The model reproduces the compression curves obtained from testing of artificial specimens quite well and have also successfully been applied to reproduce compression curves from oedometer tests on intact natural highly plastic clays presented in literature. Based on the conducted tests it was observed that the lack of stress memory was related to the void ratio increase on a former unloading step, and thus directly affected by the smectite content of the specimen and the extent of unloading. It was also found that the compression potential in normally and overconsolidated conditions is dictated by smectite content but also affected by the length of the stress path followed during testing. III ResuméFlere bygge-og anlaegsprojekter er planlagt opført på de danske palaeogene lere, f.eks. udviklingen af Aarhus Ø og etableringen af den faste forbindelse over Femern Baelt. De palaeogene lere har generelt meget høj plasticitet, lave styrker og høje deformationspotentialer, selvom de tidligere er blevet belastet af isen under forgangne istider. Nå...

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Volume change behaviour of clays: the influence of mineral composition, pore fluid composition and stress state

Cited by 204 publications

References 24 publications

Unsaturated Soils: Research and Applications

Unsaturated Soils: Research and Applications

Evaluation of clay soils’ permeability: A comparative study between the natural, compacted, and consolidated clay soils

Influence of smectite content on the deformation behaviour of clay

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