Shear strengths and volume changes of sand–attapulgite clay mixtures

Elkady, Tamer Y.; Shaker, Abdullah A.; Dhowain, Abdulmuhsin W.

doi:10.1007/s10064-014-0653-1

Cited by 25 publications

(17 citation statements)

References 20 publications

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“…However, the difference in the fines content between the initial and reconstituted soils could lead to an overestimation of the cohesion. The results of Elkady et al [8] on a sand-clay mixture showed that the cohesion-clay content curve can be divided into three parts (Figure 12):…”

Section: Discussion On the Estimation Of The Shear Strength Of Coarse...mentioning

confidence: 99%

“…This correlation was used to fit the data from Elkady et al, Hsiao et al [8,13] and this study (Figure 12). The theoretical curves were in good agreement with the experimental data.…”

Section: Discussion On the Estimation Of The Shear Strength Of Coarse...mentioning

confidence: 99%

“…For example, Ovalle et al [18] used a triaxial cell with a diameter of 1 m (dmax = 160 mm). Estaire and Ollala [8] used a direct shear box with a volume of 1 m 3 (dmax = 100 mm). Unfortunately, such devices are difficult to use and unsuitable for soils with grain sizes larger than 160 mm.…”

Section: Introductionmentioning

confidence: 99%

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An unusual left anterior descending artery myocardial bridging

Richardson

Schurtz

Silvestri

et al. 2020

Journal of Cardiovascular Computed Tomography

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Section: Discussion On the Estimation Of The Shear Strength Of Coarse...mentioning

confidence: 99%

“…This correlation was used to fit the data from Elkady et al, Hsiao et al [8,13] and this study (Figure 12). The theoretical curves were in good agreement with the experimental data.…”

Section: Discussion On the Estimation Of The Shear Strength Of Coarse...mentioning

confidence: 99%

See 1 more Smart Citation

An unusual left anterior descending artery myocardial bridging

Richardson

Schurtz

Silvestri

et al. 2020

Journal of Cardiovascular Computed Tomography

View full text Add to dashboard Cite

“…It is well reported that the coarse fraction effect is affected by the stress level, the initial density of the fine matrix, and the nature of rock aggregates 2,16,27–29 . To evaluate the coarse fraction effect on the mechanical behavior of gap‐graded granular soils, a new homogenization equation is adopted to correlate the overall tangent stiffness and the tangent stiffness of matrix.…”

Section: Introductionmentioning

confidence: 99%

A homogenization‐based state‐dependent model for gap‐graded granular materials with fine‐dominated structure

Shi

Zhao

Gao

2021

Num Anal Meth Geomechanics

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Gap‐graded granular soils are common natural soils composed of cohesionless granular matrix and rock aggregates. Since they are widely used as construction materials worldwide, their deformation behavior is crucial for the design of civil infrastructures. There have been rare constitutive models reported for gap‐graded granular soils in the literature. This study presents a homogenization‐based state‐dependent model within the elastoplastic framework. The model features a homogenization equation with a structure parameter and a novel state‐dependent dilatancy function to describe the behavior of granular matrix. Simulations of the model reveals that the initial stiffness and peak shear strength of gap‐graded soils rely on both the coarse fraction and the initial density of granular matrix. The structure parameter is related to the internal structure of gap‐graded soils, and it varies with the particle shape, and particle size distribution of rock aggregates. A higher value of the structure parameter indicates a more distinct coarse fraction effect of rock aggregates, that is, higher initial stiffness, higher peak shear strength, and higher residual shear strength. For a given coarse fraction, the critical states can be well fitted by a straight line through the origin, and the critical state strength parameter Mm increases with the rising rock fraction. A practical method is further proposed for the critical state line of gap‐graded granular soils in e‐p′ compression plane. The proposed model is validated by using experimental data from the literature, including the soils with various densities of sand matrix, different particle size, and particle size distribution of rock aggregates. Comparison between measured data and model predictions indicates that the proposed model can well reproduce the stress‐strain relationship and volumetric deformation behavior of sand‐gravel mixtures and soil‐rock mixtures.

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“…Foi verificado que, após percolação de solução contaminante NaOH, as misturas com adição de cimento não apresentaram alteração nos valores de condutividade hidráulica, indicando que a matriz de cimento formada atenuou os efeitos da solução. Elkady et al (2014) realizaram ensaios de cisalhamento direto em misturas de areia-argila atapulgita compactada e cimento (faixa de bentonita de 0-60%) com o objetivo de definir a mistura mais econômica a ser usada para o núcleo argiloso de barragens de aterros e revestimentos de resíduos sólidos. O objetivo princial foi determinar a influência do teor de argila, condições iniciais de moldagem, tensão normal e condições de umidade no comportamento de resistência ao cisalhamento.…”

Section: Misturas Solo-cimento-bentonitaunclassified

Estudo integrado do comportamento de misturas de solo arenoso, argila e cimento para aplicação em barreiras de proteção ambiental

Loch¹

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Meus sinceros agradecimentos às instituições e a todas as pessoas que contribuíram para o andamento deste trabalho. Agradeço ao Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) e Universidade de São Paulo (USP) pelo financiamento da pesquisa. Ao meu professor orientador Dr. Osni José Pejon pela orientação conferida a esta pesquisa. A todos os professores e funcionários do departamento de Geotecnia pelos ensinamentos, apoio e amizades desenvolvidas nesses anos. Agradecimento especial aos amigos Vanessa Almeida e Gian Franco, que me acompanharam todos esses anos na pós-graduação. Sou muito grato pela companhia, ajuda e presença dede o início do mestrado. A Ivinny Barros, amiga e companheira de laboratório, que participou ativamente nesta pesquisa. Sua ajuda foi fundamental para este trabalho. Aos alunos de iniciação científica André Nagem, Ricardo, Felipe Baldisseri, Kaique, Lincoln e Caio, que contribuíram muito para o andamento desta pesquisa. Foi muito bom trabalhar com vocês. Ao Giovane, que esteve presente e me acompanhou nesses anos de doutorado. Admiro muito o modo que se dedica aos seus projetos. Aos meus pais, Tania Regina e Paulino, que sempre me incentivaram e apoiaram. Acima de tudo agradeço por me guiarem na minha formação como indivíduo. Sou muito grato a todos que cruzaram o meu caminho nesses anos de pesquisa e de certo modo mudaram quem eu sou hoje. Palavras chave: barreiras de proteção ambiental, aterro sanitário, solo-cimentoargila, planejamento fatorial.

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Shear strengths and volume changes of sand–attapulgite clay mixtures

Cited by 25 publications

References 20 publications

An unusual left anterior descending artery myocardial bridging

An unusual left anterior descending artery myocardial bridging

A homogenization‐based state‐dependent model for gap‐graded granular materials with fine‐dominated structure

Estudo integrado do comportamento de misturas de solo arenoso, argila e cimento para aplicação em barreiras de proteção ambiental

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