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All Outputs (67)

The influence of particle-size distribution on critical state behavior of spherical and non-spherical particle assemblies (2018)
Journal Article
Jiang, M. D., Yang, Z. X., Barreto, D., & Xie, Y. H. (2018). The influence of particle-size distribution on critical state behavior of spherical and non-spherical particle assemblies. Granular Matter, 20(80), https://doi.org/10.1007/s10035-018-0850-x

This paper presents an investigation into the effects of particle-size distribution on the critical state behavior of granular materials using Discrete Element Method (DEM) simulations on both spherical and non-spherical particle assemblies. A series... Read More about The influence of particle-size distribution on critical state behavior of spherical and non-spherical particle assemblies.

New method for rock qualification (2018)
Presentation / Conference Contribution
János, L., Emőke, I., Phong. Q, T., Miklós, G., László, K., István, T., Barreto Gonzalez, D., Casini, F., & Guida, G. (2018, April). New method for rock qualification. Presented at Mérnökgeológia - Kőzetmechanika 2018 (Engineering Geology and Rock Mechanics Congress 2018)

A new method was elaborated to characterize the breakage properties of rocks. A crushing test was suggested and parallel tests were performed on sand-pairs with different parent rocks, using identical initial gradings. The data were analyse... Read More about New method for rock qualification.

The influence of particle geometry and the intermediate stress ratio on the shear behavior of granular materials (2017)
Journal Article
Xie, Y. H., Yang, Z. X., Barreto, D., & Jiang, M. D. (2017). The influence of particle geometry and the intermediate stress ratio on the shear behavior of granular materials. Granular Matter, 19(2), 34-48. https://doi.org/10.1007/s10035-017-0723-8

The behavior of granular materials is very complex in nature and depends on particle shape, stress path, fabric, density, particle size distribution, amongst others. This paper presents a study of the effect of particle geometry (aspect ratio) on the... Read More about The influence of particle geometry and the intermediate stress ratio on the shear behavior of granular materials.

The Influence of Particles’ Aspect Ratio on the Shear Behaviour of Granular Materials (2016)
Presentation / Conference Contribution
Xie, Y. H., Yang, Z. X., & Barreto, D. (2016, August). The Influence of Particles’ Aspect Ratio on the Shear Behaviour of Granular Materials. Presented at 7th International Conference on Discrete Element Methods, Dalian, China

The mechanical response of granular material depends both on the material properties (e.g. stiffness, anisotropy, permeability, etc.) and particle geometry (shape, roughness, etc.). This paper presents a study of the effect of particle shape (i.e. as... Read More about The Influence of Particles’ Aspect Ratio on the Shear Behaviour of Granular Materials.

Revisiting the particle size effects in centrifuge modelling (2016)
Presentation / Conference Contribution
Nadimi, S., Fonseca, J., Taylor, R. N., & Barreto, D. (2016, June). Revisiting the particle size effects in centrifuge modelling. Presented at The 3rd European Conference on Physical Modelling in Geotechnics, Nantes, France

Geotechnical centrifuge modelling provides an opportunity to examine novel and complex events in a well-controlled and repeatable environment. While grain interaction and contact dynamics are considered in centrifuge modelling, the soil is treated as... Read More about Revisiting the particle size effects in centrifuge modelling.

Micromechanical insight into the undrained instability of granular materials: deformation characteristics of geomaterials. (2015)
Presentation / Conference Contribution
Barreto, D., Prada-Sarmiento, L. F., & Ramos-Cañón, A. M. (2015, November). Micromechanical insight into the undrained instability of granular materials: deformation characteristics of geomaterials. Presented at 6th International Symposium on Deformation Characteristics of Geomaterials

There is no agreement between experimental researchers whether the point where a granular material responds with a large change of stresses, strains or excess pore water pressure given a prescribed small input of some of the same variables defines a... Read More about Micromechanical insight into the undrained instability of granular materials: deformation characteristics of geomaterials..

An overview of research activities and achievement in Geotechnics from the Scottish Universities Geotechnics Network (SUGN) (2015)
Presentation / Conference Contribution
Leung, A., Anastasopoulos, I. X., Augarde, C. E., Barreto, D., Brennan, A. J., Brown, M. J. Z., Connolly, D., Coombs, W. M., Davies, T., Gao, Z., Ivanovic, A., Kenny, M., Knappett, J. A., Lombardi, D., McDougall, J., Medero, G., Muir Wood, D., El Mountassir, G., Osman, A. S., Pytharouli, S., …Zielinski, M. (2015, September). An overview of research activities and achievement in Geotechnics from the Scottish Universities Geotechnics Network (SUGN). Presented at 16th European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh

Design of geotechnical systems is often challenging as it requires the understanding of complex soil behaviour and its influence on field-scale performance of geo-structures. To advance the scientific knowledge and the technological development in ge... Read More about An overview of research activities and achievement in Geotechnics from the Scottish Universities Geotechnics Network (SUGN).

Use of DEM and elastic stability analysis to explain the influence of the intermediate principal stress on shear strength (2013)
Journal Article
O'Sullivan, C., Wadee, M., Hanley, K., & Barreto, D. (2013). Use of DEM and elastic stability analysis to explain the influence of the intermediate principal stress on shear strength. Géotechnique, 63(15), 1298-1309. https://doi.org/10.1680/geot.12.p.153

One interesting aspect of soil response is the sensitivity of the mechanical behaviour to the intermediate principal stress. In this study, a fundamental mechanism that explains the influence of the intermediate stress ratio (b) on soil shear strengt... Read More about Use of DEM and elastic stability analysis to explain the influence of the intermediate principal stress on shear strength.

Volumetric consequences of particle loss by grading entropy (2013)
Journal Article
McDougall, J., Imre, E., Barreto, D., & Kelly, D. (2013). Volumetric consequences of particle loss by grading entropy. Géotechnique, 63(3), 262-266. https://doi.org/10.1680/geot.sip13.t.002

Chemical and biological processes, such as dissolution in gypsiferous sands and biodegradation in waste refuse, result in mass or particle loss, which in turn lead to changes in solid and void phase volumes and grading. Data on phase volume and gradi... Read More about Volumetric consequences of particle loss by grading entropy.

Particle loss and volume change on dissolution: experimental results and analysis of particle size and amount effects (2013)
Journal Article
McDougall, J., Kelly, D., & Barreto, D. (2013). Particle loss and volume change on dissolution: experimental results and analysis of particle size and amount effects. Acta geotechnica, 8(6), 619-627. https://doi.org/10.1007/s11440-013-0212-0

Soil particles may be lost through dissolution, degradation or erosion. Regardless of the process of loss, there follows a change in soil structure both in terms of phase composition and grading. In this paper, the influence of size and amount of par... Read More about Particle loss and volume change on dissolution: experimental results and analysis of particle size and amount effects.

Quantifying stress-induced anisotropy using inter-void constrictions (2013)
Journal Article
Shire, T., O'Sullivan, C., Barreto, D., & Gaudray, G. (2013). Quantifying stress-induced anisotropy using inter-void constrictions. Géotechnique, 63(1), 85-91. https://doi.org/10.1680/geot.11.t.020

In particulate geomechanics it is common to quantify fabric anisotropy using contact and particle orientations. Measurement of void anisotropy is less common, most likely owing to the difficulties associated with defining individual voids. Here a Del... Read More about Quantifying stress-induced anisotropy using inter-void constrictions.

Effect of particle loss on soil behaviour. (2012)
Presentation / Conference Contribution
Kelly, D., McDougall, J., & Barreto, D. (2012, August). Effect of particle loss on soil behaviour. Paper presented at ICSE-6 6th International Conference on Scour and Erosion

Soil particle loss can result in strength and volume reductions which are difficult to predict. This paper investigates the
influence of the removal of fractions of selected particle sizes under different confining pressures. The mass loss
process... Read More about Effect of particle loss on soil behaviour..

The use of electronic voting systems to enhance deep learning. (2012)
Presentation / Conference Contribution
Barreto, D. (2012, July). The use of electronic voting systems to enhance deep learning

The present paper introduces a technology-enhanced teaching method that promotes deep learning.
Four stages that correspond to four different student cohorts were used for its development and to analyse
its effectiveness. The effectiveness of the m... Read More about The use of electronic voting systems to enhance deep learning..

The influence of inter-particle friction and the intermediate stress ratio on soil response under generalised stress conditions (2012)
Journal Article
Barreto, D., & O'Sullivan, C. (2012). The influence of inter-particle friction and the intermediate stress ratio on soil response under generalised stress conditions. Granular Matter, 14(4), 505-521. https://doi.org/10.1007/s10035-012-0354-z

Previous research studies have used either physical experiments or discrete element method (DEM) simulations to explore, independently, the influence of the coefficient of inter-particle friction (μ) and the intermediate stress ratio (b) on the behav... Read More about The influence of inter-particle friction and the intermediate stress ratio on soil response under generalised stress conditions.

Using DEM for the assessment of K0 in soils. (2011)
Presentation / Conference Contribution
Barreto, D. (2010, August). Using DEM for the assessment of K0 in soils. Presented at Fifth international conference on discrete element methods