The strength and dilatancy of sand

Vaid, Y. P.; Sasitharan, S.

doi:10.1139/t92-058

Cited by 96 publications

(39 citation statements)

References 10 publications

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“…His strength criterion is still applied in contemporary soil mechanics, as better alternative has not been found yet, although some authors have tried to modify his strength criterion by adding the effect of dilation, Rowe (1962), Bolton (1986), Houlsby (1991), Schanz and Vermeer (1996), Vaid and Sasitharan (1992). Still unsolved problem in geomechanics is determination of the pre-failure behaviour of these materials, see Sawicki (2012) who provides extensive references.…”

Section: Dilation and Cam-clay Plasticitymentioning

confidence: 99%

Dilation and Modelling of Sands in the Light of Experimental Data

Sawicki

2014

Archives of Hydro-Engineering and Environmental Mechanics

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The problem of dilation is discussed in the context of classical Cam-Clay model, which was developed on the basis of a specific assumption regarding the plastic work. This assumption leads to a special form of the dilation function, from which a shape of yield function is derived. The above mentioned assumption is compared with the results of the triaxial tests, performed on the model "Skarpa" sand. It is shown that the Cam-Clay approach is not realistic, as it is based on the assumption which is not consistent with experimental data. Some general considerations and discussion of this problem are also presented.

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Section: Dilation and Cam-clay Plasticitymentioning

confidence: 99%

Dilation and Modelling of Sands in the Light of Experimental Data

Sawicki

2014

Archives of Hydro-Engineering and Environmental Mechanics

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“…Este reordenamiento interno ocurre porque una partícula se desliza encima de la otra, para a veces quedar más separadas o más unidas dependiendo de la condición inicial de la roca. [29] Al aumentarse el volumen y reordenarse las partículas se crean espacios entre cada grano, el cual se puede llenar de agua, aceite o cualquier tipo de fluido, este se filtra hacia el espacio que se ha generado [47] Cuando ocurre la dilatancia, la permeabilidad y la porosidad se ven afectadas ya que se inducen cambios en los espacios entre los granos [49], esto hace que la resistencia de la roca disminuya y la roca falle más rápido [11]. existe una configuración inicial de los granos sometidos a esfuerzos, donde hay un área critica entre cada grano, ésta va cambiando su dirección a medida que los esfuerzos cambian, esto hace que se modifique la permeabilidad [3].…”

Section: Dilatanciaunclassified

Estudio Y Evaluación De Los Modelos Matemáticos Para La Estimación De La Dilatancia

Rondón

Fuentes

Quintero

2015

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*A quien debe dirigirse la correspondencia RESUMEN el artículo muestra una revisión bibliográfi ca de los principales modelos que existen para el cálculo de la dilatancia en la roca. una vez explicado cada modelo, se procede a realizar el modelamiento matemático de ésta propiedad. Esto se realiza mediante datos suministrados por la literatura, las cuales son: esfuerzos sometidos a la roca σ1,σ2,σ3, ángulo de fricción interna ∅, pendiente de la línea de estado critico M, el parámetro de estado , y otras constantes que se requieren para cada modelo. Una vez hechos los cálculos de la dilatancia en la roca, se procede a validar el modelamiento con datos reales, los cuales también son suministrados por la literatura. En éstas pruebas se midió la dilatancia real en dos tipos de arena, (Banding y Miga) y se realizaron 5 pruebas. Finalmente éstas mediciones se compararon con los cálculos realizados, y así llegar a la conclusión de que el mejor modelo para predecir el fenómeno dilatante de una roca es el de Li & Dafalias.Palabras clave: Arenamiento, dilatancia, estado crítico, suelos granulares. Study and evaluation of mathematical models for estimating dilatancyABSTRACT the article shows a literature review of the main models that exist for the calculation of dilatancy in the rock, which is a property that has an application in the study of the phenomenon of sanding in oil wells. Having explained each model, we proceed to perform mathematical modeling of this property. This is done using data supplied by the literature, which are: strain in the rock σ1, σ2, σ3, internal friction angle ∅, slope of the critical state line M, the state parameter φ, and other constants which are required for each model. Once dilatancy calculations are made in the rock, we proceed to validate the modeling with real data, which are also supplied by the literature. in these tests, the dilatancy was measured in two types of sand, (Banding and crumb) from which 5 tests were done; these measurements were compared with calculations, and fi nally concludes that the best model to predict the dilatant rock phenomenon is Li & Dafalias.

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“…(2a) (e.g. Houlsby, 1991;Vaid and Sasitharan, 1992), c in triaxial compression loading, for example, is given by:…”

Section: The Definition Of Angle Of Dilation Cmentioning

confidence: 99%

“…In order to consider the relative suitability of the alternative deˆnitions of c presented above, an analysis has been made of triaxial compression and extension failure data presented by Vaid and Sasitharan (1992). Figure 1 shows the relationship between q and c, based on the results of 53 triaxial compression and extension tests on Erksak sand, tested at various relative densities, under various conˆning stresses and following various stress paths.…”

Section: The Definition Of Angle Of Dilation Cmentioning

confidence: 99%