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Standard penetration testing in a virtual calibration chamber
(Elsevier, 2019-07)
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Article.
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The virtual calibration chamber technique, based on the discrete element method, is here applied to study the standard penetration test (SPT). A macro-element approach is used to represent a rod driven with an impact like ...
Linking shape and rotation of grains during triaxial compression of sand
(2020-11)
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Article.
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Particle shape has a strong effect on the mechanical response of coarse soils. This has been usually observed examining specimen-scale or engineering-scale responses, which are the sum of many microscale interactions. In ...
Micromechanical inspection of incremental behaviour of crushable soils
(Springer, 2019-10)
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Article.
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In granular soils grain crushing reduces dilatancy and stress obliquity enhances crushability. These are well-supported specimen-scale experimental observations. In principle, those observations should reflect some peculiar ...
Sphericity measures of sand grains
(2019-05)
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Article.
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The sphericity of a grain should measure the similitude of its shape with that of a sphere. Sphericity is a shape descriptor of long-standing interest for sedimentology. Now it has gained also interest to facilitate discrete ...
A contact model for rough crushable sand
(2021-06)
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Article.
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Sand roughness is now accessible to measurement. Incorporating this parameter into sand models using the discrete element method (DEM) is known to improve bulk small strain response. In this work we explore the effect on ...
Hydraulic conductivity from piezocone on-the-fly: a numerical evaluation
(Institution of Civil Engineers (ICE), 2018-12)
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Article.
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Permeability is important in many geotechnical applications. The current CPTu practice to obtain permeability values relies on dissipation tests, which are frequently slow and only linked to permeability through compressibility ...
Energy balance analyses during Standard Penetration Tests in a virtual calibration chamber
(Elsevier, 2021-05)
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Article.
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The Standard Penetration Test (SPT) is the most popular example of dynamic probing, a large category of soil testing techniques. Understanding and interpretation of these tests is hampered by the difficulties of reproducing ...
A stable mesh-independent approach for numerical modelling of structured soils at large strains
(Elsevier, 2019-12)
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Article.
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We describe the large strain implementation of an elasto-plastic model for structured soils into G-PFEM, a code developed for geotechnical simulations using the Particle Finite Element Method. The constitutive model is ...
Large-strain analysis of undrained smooth tube sampling
(Thomas Telford, 2022-01)
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Article.
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Borehole tube sampling is a key process of geotechnical engineering. The paper presents numerical analyses of smooth tube sampling in clay using the Particle Finite Element Method (PFEM). The soil is described by a ...