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Discrete Element Study of Particle Size Distribution Shape Governing Critical State Behavior of Granular Material (2025)
Journal Article
Jiang, M., Barreto, D., Ding, Z., & Yang, K. (2025). Discrete Element Study of Particle Size Distribution Shape Governing Critical State Behavior of Granular Material. Fractal and Fractional, 9(1), Article 26. https://doi.org/10.3390/fractalfract9010026

Granular soil is a porous medium composed of particles with different sizes and self-similar structures, exhibiting fractal characteristics. It is well established that variations in these fractal properties, such as particle size distribution (PSD),... Read More about Discrete Element Study of Particle Size Distribution Shape Governing Critical State Behavior of Granular Material.

Grading curve relations for saturated hydraulic conductivity of granular materials (2024)
Journal Article
Imre, E., Illés, Z., Casini, F., Guida, G., Feng, S., Datcheva, M., Baille, W., Bálint, Á., Mwinken, D. K., Lorincz, J., Leak, J., & Barreto, D. (online). Grading curve relations for saturated hydraulic conductivity of granular materials. Environmental Geotechnics, https://doi.org/10.1680/jenge.23.00131

Estimation of hydraulic conductivity in soils is challenging. The primary aim of this study is to demonstrate that such predictions may be improved if grading curves are appropriately quantified and described, as well as by including density-related... Read More about Grading curve relations for saturated hydraulic conductivity of granular materials.

Use of hydraulic radius to estimate the permeability of coarse-grained materials using a new geodatabase (2023)
Journal Article
Feng, S., Barreto, D., Imre, E., Ibraim, E., & Vardanega, P. J. (2023). Use of hydraulic radius to estimate the permeability of coarse-grained materials using a new geodatabase. Transportation Geotechnics, 41, Article 101026. https://doi.org/10.1016/j.trgeo.2023.101026

This paper reviews commonly used parameters and prediction models for assessing permeability of granular soils. Following a review of published models for prediction of soil permeability, a dimensional homogenous transformation model for a-priori est... Read More about Use of hydraulic radius to estimate the permeability of coarse-grained materials using a new geodatabase.

Rubber-soil mixtures: use of grading entropy theory to evaluate stiffness and liquefaction susceptibility (2023)
Journal Article
Bernal-Sanchez, J., Barreto, D., & Leak, J. (2023). Rubber-soil mixtures: use of grading entropy theory to evaluate stiffness and liquefaction susceptibility. Bulletin of Earthquake Engineering, 21, 3777–3796. https://doi.org/10.1007/s10518-023-01673-3

Rubber-soil mixtures are known to have mechanical properties that enable their use in backfills, road construction or geotechnical seismic isolation systems. The complexity of these mixtures comes from adding soft (i.e. rubber) particles that increas... Read More about Rubber-soil mixtures: use of grading entropy theory to evaluate stiffness and liquefaction susceptibility.

Quantifying Particle Breakage and Its Evolution Using Breakage Indices and Grading Entropy Coordinates (2022)
Journal Article
Leak, J., Barreto, D., Dimitriadi, V., & Imre, E. (2022). Quantifying Particle Breakage and Its Evolution Using Breakage Indices and Grading Entropy Coordinates. Geotechnics, 2(4), 1109-1126. https://doi.org/10.3390/geotechnics2040052

Particle breakage in soils is a well-recognised behaviour. Conventional methods for quantifying the breakage process rely on calculating the area between the particle size distribution (PSD) curves produced before and after crushing. A key aspect of... Read More about Quantifying Particle Breakage and Its Evolution Using Breakage Indices and Grading Entropy Coordinates.

Recent Advances in Nature-Inspired Solutions for Ground Engineering (NiSE) (2021)
Journal Article
Assadi-Langroudi, A., O’Kelly, B. C., Barreto, D., Cotecchia, F., Dicks, H., Ekinci, A., Garcia, F. E., Harbottle, M., Tagarelli, V., Jefferson, I., Maghoul, P., Masoero, E., El Mountassir, G., Muhunthan, B., Geng, X., Ghadr, S., Mirzababaei, M., Mitrani, H., & van Paassen, L. (2022). Recent Advances in Nature-Inspired Solutions for Ground Engineering (NiSE). International Journal of Geosynthetics and Ground Engineering, 8(1), Article 3. https://doi.org/10.1007/s40891-021-00349-9

The ground is a natural grand system; it is composed of myriad constituents that aggregate to form several geologic and biogenic systems. These systems operate independently and interplay harmoniously via important networked structures over multiple... Read More about Recent Advances in Nature-Inspired Solutions for Ground Engineering (NiSE).

Some Notes on Granular Mixtures with Finite, Discrete Fractal Distribution (2021)
Journal Article
Imre, E., Talata, I., Barreto, D., Datcheva, M., Baille, W., Georgiev, I., Fityus, S., Singh, V. P., Casini, F., Guida, G., Trang, P. Q., & Lőrincz, J. (2022). Some Notes on Granular Mixtures with Finite, Discrete Fractal Distribution. Periodica Polytechnica Civil Engineering, 66(1), 179-192. https://doi.org/10.3311/ppci.19103

Why fractal distribution is so frequent? It is true that fractal dimension is always less than 3? Why fractal dimension of 2.5 to 2.9 seems to be steady-state or stable? Why the fractal distributions are the limit distributions of the degradation pat... Read More about Some Notes on Granular Mixtures with Finite, Discrete Fractal Distribution.

The geoengineering approach to the study of rivers and reservoirs (2019)
Journal Article
Corbett, P. W., Owen, A., Hartley, A., Pla-Pueyo, S., Barreto Gonzalez, D., Hackney, C., & Kape, S. (2019). The geoengineering approach to the study of rivers and reservoirs. Geological Society Special Publications, https://doi.org/10.1144/SP488-2018-98

This volume contains contributions for two meetings held to explore the links between geoscience and engineering in rivers and reservoirs (surface and subsurface). The first meeting was held in Brazil and as a result the volume contains many contrib... Read More about The geoengineering approach to the study of rivers and reservoirs.

Particle-scale interaction in sand-rubber mixtures and their influence on energy dissipation mechanisms (2019)
Journal Article
Fonseca, J., Riaz, A., Bernal-Sanchez, J., Barreto Gonzalez, D., McDougall, J., Miranda Manzanares, M., Marinelli, A., & Dimitriadi, V. (2019). Particle-scale interaction in sand-rubber mixtures and their influence on energy dissipation mechanisms. Géotechnique Letters, 9(4), 1-6. https://doi.org/10.1680/jgele.18.00221

Sand-rubber mixture (SRm) behaviour is affected by rubber content (RC) whilst dissipation in sands is caused by inter-particle sliding. Dissipation in SRm is as, or more significant than in sands. However, the mechanisms of dissipation in SRm are not... Read More about Particle-scale interaction in sand-rubber mixtures and their influence on energy dissipation mechanisms.

Particle loss: An initial investigation into size effects and stress-dilatancy (2019)
Journal Article
McDougall, J., Kelly, D., & Barreto, D. (2019). Particle loss: An initial investigation into size effects and stress-dilatancy. Soils and Foundations, https://doi.org/10.1016/j.sandf.2019.03.002

Drained triaxial tests have been performed to explore the effect of particle loss on shearing behaviour and critical states in granular mixtures. The mixtures comprise Leighton Buzzard sand (d50 = 0.8 mm), to which was added 15% by mass of salt parti... Read More about Particle loss: An initial investigation into size effects and stress-dilatancy.

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.

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.

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.

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.