Mechanisms controlling the behaviour of double-porosity clay fills;
            <i>in situ</i>
            and centrifuge study

Najser, Jan; Pooley, Emma J.; Springman, Sarah M.; Laue, Jan; Boháč, Jan

doi:10.1144/1470-9236/08-033

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…Soil aggregation is commonly encountered in nature, such as in the plough layer of tilled soils, in biologically active forest soils, and in humusrich calcareous top soils (Šim unek et al 2003;Gerke 2006;Koliji et al 2006Koliji et al , 2010bCarminati et al 2007;Jarvis 2007). It is also common in engineered geotechnical structures such as compacted soils and landfills (Feda 1998;Li and Zhang 2009;Najser et al 2010Najser et al , 2012Romero et al 2011;Della Vecchia and Romero 2013;Musso et al 2013;Burton et al 2014). It is well recognized that all natural reservoir rocks possess fissures to some extent (Barenblatt et al 1960;Warren and Root 1963;Kazemi et al 1976;Moench 1984;Lewandowska and Auriault 2013;Katsuki et al 2014;Vu et al 2014;Bennett et al 2015), and additional fissures may be induced by engineering activities (Abousleiman et al 2014;Carneiro 2009;Weng et al 2011;Foster and Mohammad Nejad 2013;Lamb et al 2013;Li et al 2013;Rahman and Rahman 2013a, b;Mohammadnejad and Khoei 2013;Zhang et al 2015;Yin 2013;White et al 2014;Tjioe and Borja 2015).…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media

2016

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Geomaterials with aggregated structure or containing fissures often exhibit a bimodal pore size distribution that can be viewed as two coexisting pore regions of different scales. The double-porosity concept enables continuum modeling of such materials by considering two interacting pore scales satisfying relevant conservation laws. This paper develops a thermodynamically consistent framework for hydromechanical modeling of unsaturated flow in double-porosity media. With an explicit treatment of the two pore scales, conservation laws are formulated incorporating an effective stress tensor that is energy-conjugate to the rate of deformation tensor of the solid matrix. A constitutive framework is developed on the basis of energy-conjugate pairs identified in the first law of thermodynamics, which is then incorporated into a three-field mixed finite-element formulation for double-porosity media. Numerical simulations of laboratory-and field-scale problems are presented to demonstrate the impact of double porosity on the resulting hydromechanical responses.

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Section: Introductionmentioning

confidence: 99%

Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media

2016

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“…without the use of additives. The paper mentioned earlier by Najser et al (2010) describes such an application, considering the behaviour of excavated and redeposited or 'lumpy' soils. In recent years there has been an increasing use of additives and associated processes to improve ground conditions.…”

Section: Ground Improvement Using Additivesmentioning

confidence: 99%

Geomaterials: aggregates, building stone and earthworks: papers from 50 years of QJEGH

Cassar

Standing

2017

QJEGH

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Numerous papers encompassed within the broad subject of geomaterials have been published in QJEGH over the past 50 years. These have been compiled and divided here into three main categories: aggregates, building stone and earthworks. The aim of this review is to provide a comprehensive summary of the relevant papers published in QJEGH with a view to identifying the main areas of interest historically, now and in the future. Some clear trends are evident from the survey and review, for example: a steady interest in building stone and in particular its deterioration; a decline in papers on earthworks and an increase in ground improvement (also covered here). It is also noted that methods of characterizing geomaterials are becoming more sophisticated with advancing technology. The review makes relevant links with other Special Publications from the Geological Society, including also Engineering Geology Special Publications.

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“…Details about the centrifuge test, model preparation and instrumentation are beyond the scope of this paper and can be found, e.g. in Najser et al 52.…”

Section: Modelling Of Centrifuge Testsmentioning

confidence: 99%

Numerical modelling of lumpy clay landfill

Najser

Maš́ın

Boháč

2010

Num Anal Meth Geomechanics

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SUMMARYTwo trial motorway embankments built on a landfill consisting of clayey lumps were monitored over the period of 3 and 5 years, respectively. The subsoil of the embankment was instrumented by hydrostatic levelling profiles, pore pressure transducers and depth reference points installed in boreholes. An advanced constitutive model for clays (hypoplastic model for clays with meta-stable structure) was used for numerical modelling of both case histories. Basic hypoplastic model for clays was calibrated using isotropic compression tests and triaxial compression tests on reconstituted clay. Three additional model parameters describing the effects of lumpy structure were calibrated using oedometer tests on specimens prepared from scaled-down lumpy material (material with smaller size of clay lumps). The performance of the model was evaluated by comparison with the results of the centrifuge model of self-weight consolidated landfill. Finally, the hypoplastic model was used for simulation of both trial embankments and the results were compared with in situ measurements. The degradation of the lumpy structure of the upper layer of the in situ landfill due to weathering was back analysed using monitoring data.

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Mechanisms controlling the behaviour of double-porosity clay fills; in situ and centrifuge study

Cited by 15 publications

References 9 publications

Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media

Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media

Geomaterials: aggregates, building stone and earthworks: papers from 50 years of QJEGH

Numerical modelling of lumpy clay landfill

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