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A DEM study on the effect of inherent variability of assemblies of spherical particles (2023)
Conference Proceeding
Leak, J., & Barreto, D. (2023). A DEM study on the effect of inherent variability of assemblies of spherical particles. In Proceedings 10th NUMGE 2023: 10th European Conference on Numerical Methods in Geotechnical Engineering. https://doi.org/10.53243/NUMGE2023-388

This study presents DEM simulations of assemblies of spheres using periodic boundaries to assess the effect of inherent sample variability. DEM specimens with different particle size distributions (PSDs) were randomly generated, and then isotropicall... Read More about A DEM study on the effect of inherent variability of assemblies of spherical particles.

Numerical Experimental Investigations Into Force Chain Networks In Soils: A Grading Entropy Approach (2023)
Presentation / Conference
Leak, J., Barreto, D., & Imre, E. (2023, May). Numerical Experimental Investigations Into Force Chain Networks In Soils: A Grading Entropy Approach. Paper presented at Numerical Analysis of Geomaterials Conference (NANGE), Assisi, Italy

These slides were presented at the numerical analysis of geomaterials conference in Assisi in 2023. They detail an experimental and numerical investigation into the effect of particle size distribution (PSD) on soil fabric. Grading entropy was used t... Read More about Numerical Experimental Investigations Into Force Chain Networks In Soils: A Grading Entropy Approach.

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.

What Can Grading Entropy Tell Us About Soil Fabric? (2022)
Presentation / Conference
Leak, J., Barreto, D., & Dimitriadi, V. (2022, December). What Can Grading Entropy Tell Us About Soil Fabric?. Paper presented at 19th Annual Geomechanics Form Micro to Macro Conference, London

These slides were presented at the 19th annual geomechanics form micro to macro conference at Imperial College London in 2022. They detail an investigation into characterising soil fabric effects using the normalised entropy coordinates proposed by L... Read More about What Can Grading Entropy Tell Us About Soil Fabric?.

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.

Fines content effects on liquefaction susceptibility, void ratio & soil fabric: a grading entropy approach (2022)
Presentation / Conference
Leak, J. (2022, April). Fines content effects on liquefaction susceptibility, void ratio & soil fabric: a grading entropy approach. Paper presented at 18th European Mechanics of Materials Conference: Mechanics of porous and granular materials, Oxford

These slides were presented at the 18th European Mechanics of Materials Conference: Mechanics of porous and granular materials (2022). They discuss research into the effect of increasing fines content in soils with regard to their internal stability.... Read More about Fines content effects on liquefaction susceptibility, void ratio & soil fabric: a grading entropy approach.

A DEM Study On The Effect Of Inherent Variability In Assemblies Of Spherical Particles (2021)
Presentation / Conference
Leak, J., Barreto, D., & Dimitriadi, V. (2021, December). A DEM Study On The Effect Of Inherent Variability In Assemblies Of Spherical Particles. Paper presented at 18th Annual Geomechanics From Micro to Macro Conference, Dundee

These slides were presented at the 18th annual geomechanics from micro to macro conference in 2021 at the university of Dundee. They detail a study on the effect of inherent variability on soil parameters (such as initial void ratio, peak stress etc.... Read More about A DEM Study On The Effect Of Inherent Variability In Assemblies Of Spherical Particles.

Revisiting Hardin’s parameters for the quantification of particle breakage – A statistical entropy approach (2021)
Conference Proceeding
Leak, J., Barreto, D., Dimitriadi, V., & Imre, E. (2021). Revisiting Hardin’s parameters for the quantification of particle breakage – A statistical entropy approach. In Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media. https://doi.org/10.1051/epjconf/202124907001

It is well recognised that particle breakage in granular materials is affected by stress level, stress path, initial density, and particle size distribution (PSD), amongst others. Furthermore, it has been shown that breakage has a significant influen... Read More about Revisiting Hardin’s parameters for the quantification of particle breakage – A statistical entropy approach.

A guide to modeling the geotechnical behavior of soils using the discrete element method (2021)
Book Chapter
Barreto Gonzalez, D., & Leak, J. (2021). A guide to modeling the geotechnical behavior of soils using the discrete element method. In P. Samui, S. Kumari, V. Makarov, & P. Kurup (Eds.), Modeling in geotechnical engineering (79-100). London: Elsevier. https://doi.org/10.1016/B978-0-12-821205-9.00016-2

This article describes the discrete element method (DEM) for the modeling of the geotechnical behavior of soils. Emphasis is made on a description of the algorithms and capabilities of the method rather than on the implementation details and equation... Read More about A guide to modeling the geotechnical behavior of soils using the discrete element method.

Quantification of Particle Breakage & its Evolution using Statistical Entropy- A Grading Entropy Approach (2020)
Presentation / Conference
Leak, J., Barreto, D., Dimitriadi, V., & Imre, E. (2020, December). Quantification of Particle Breakage & its Evolution using Statistical Entropy- A Grading Entropy Approach. Paper presented at 17th Annual Geomechanics From Micro to Macro Conference, Online

These slides were presented at the 17th annual geomechanics from micro to macro conference in 2020. They detail the comparison of the well known, and commonly used, relative breakage parameter used to assess the degree of particle breakage in soils.... Read More about Quantification of Particle Breakage & its Evolution using Statistical Entropy- A Grading Entropy Approach.

Grading entropy coordinates and criteria for evaluation of liquefaction potential (2019)
Conference Proceeding
Barreto Gonzalez, D., Leak, J., Dimitriadi, V., McDougall, J., Imre, E., & Lőrincz, J. (2019). Grading entropy coordinates and criteria for evaluation of liquefaction potential. In Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions (1346-1353). https://doi.org/10.1201/9780429031274

Several methods are commonly used for the evaluation of liquefaction potential in soils. These include criteria based on SPT and CPT tests, shear wave velocity measurements and gradation limits, amongst others. This study applies the concept of gradi... Read More about Grading entropy coordinates and criteria for evaluation of liquefaction potential.