Cone penetration tests in a virtual calibration chamber

Arroyo, Marcos; Butlanska, Joanna; Gens, Antonio; Calvetti, Francesco; Jamiolkowski, Michele

doi:10.1680/geot.9.p.067

Cited by 127 publications

(70 citation statements)

References 12 publications

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“…One problem where this type of simulation might be helpful is cone penetration. Arroyo et al [1] validated this approach, showing that 3D DEM models of CPT in a calibration chamber resulted in cone point resistance values in close agreement with predictions based in physical models. Several aspects of this type of models have been explored further by Butlanska et al [3], Butlanska et al [4], McDowell et al [11], Lin and Wu [8] and Arroyo et al [2].…”

Section: Introductionmentioning

confidence: 74%

“…This proves that these oscillations appearing in the graph can be treated as a noise artifact of the scaled-up discrete material. To filter that noise the following trend line is fitted to the raw penetration curves (Arroyo et al [1]…”

Section: Macroscopic Steady Statementioning

confidence: 99%

“…

Abstract: It has recently been shown (Arroyo et al [1]) that 3D DEM models are able to reproduce with reasonable accuracy the macroscopic response of CPT performed in calibration chambers filled with sand. However, the cost of each simulation is an important factor.

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mentioning

confidence: 99%

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Steady state of solid-grain interfaces during simulated CPT

Butlanska¹,

Arroyo²,

Gens³

2013

Studia Geotechnica Et Mechanica

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It has recently been shown (Arroyo et al. [1]) that 3D DEM models are able to reproduce with reasonable accuracy the macroscopic response of CPT performed in calibration chambers filled with sand. However, the cost of each simulation is an important factor. Hence, to achieve manageable simulation times the discrete material representing the sand was scaled up to sizes that were more typical of gravel than sand. A side effect of the scaled-up discrete material size employed in the model was an increased fluctuation of the macro-response that can be filtered away to observe a macroscopic steady-state cone resistance. That observation is the starting point of this communication, where a series of simulations in which the size ratio between penetrometer and particles is varied are systematically analyzed. A micromechanical analysis of the penetrometer-particle interaction is performed. These curves reveal that a steady state is arrived also at the particle-cone contact level. The properties of this dynamic interface are independent of the initial density of the granular material.

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Section: Introductionmentioning

confidence: 74%

Section: Macroscopic Steady Statementioning

confidence: 99%

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Steady state of solid-grain interfaces during simulated CPT

Butlanska¹,

Arroyo²,

Gens³

2013

Studia Geotechnica Et Mechanica

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“…A further step along this line is to use upscaled particle sizes, a technique previously applied in geotechnical engineering applications (Utili & Nova, 2008;Gabrieli et al, 2009;Arroyo et al, 2011;Butlanska et al, 2013). Upscaling rules are here proposed for particle strength and for contact stiffness parameters, using both linear and Hertzian contact laws.…”

Section: Introductionmentioning

confidence: 99%

An approach to enhance efficiency of DEM modelling of soils with crushable grains

Ciantia¹,

Arroyo²,

Calvetti³

et al. 2015

Géotechnique

Self Cite

157

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In this study oedometric compression tests of hydrocarbon coke, Fontainebleau sand and silica sand are simulated in three dimensions using breakable particles. The method adapts a rigorous breakage criterion for elasto-brittle spheres to represent failure of grains isolated between platens or within granular masses. The breakage criterion allows for the effect of particle bulk and contact properties to be treated separately. A discrete fragmentation multigenerational approach is applied as a spawning procedure. The number of particles quickly increases during the simulation, but is kept manageable by systematic fine exclusion and upscaling. Fine exclusion leads to mass losses between generations, but that loss is accounted for outside the mechanical model. Sensitivity analysis shows that it is enough to keep 53% of the crushed particle mass within the mechanical model to correctly reproduce experimental macroscopic behaviour. Practical upscaling rules are proposed for (a) contact stiffness, (b) breakage criteria and (c) grain size distribution, and validated simulating the same test, reducing by half the initial number of particles. The results are promising as both the mechanical and grading evolution are well captured with two orders of magnitude savings in computing efficiency.

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“…Arroyo et al [10] used a 3D DEM model of a virtual calibration chamber to simulate cone penetration tests in sand using spheres with prohibited rotation. Their results were compared to experimental tests conducted in Ticino sand by Jamiolkowski et al [11].…”

Section: Introductionmentioning

confidence: 99%

Discrete element modelling and cavity expansion analysis of cone penetration testing

Falagush

McDowell

et al. 2015

Granular Matter

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThis paper uses the discrete element method (DEM) in three dimensions to simulate cone penetration testing (CPT) of granular materials in a calibration chamber. Several researchers have used different numerical techniques such as strain path methods and finite element methods to study CPT problems. The DEM is a useful alternative tool for studying cone penetration problems because of its ability to provide micro mechanical insight into the behaviour of granular materials and cone penetration resistance. A 30° chamber segment and a particle refinement method were used for the simulations. Giving constant mass to each particle in the sample was found to reduce computational time significantly, without significantly affecting tip resistance. The effects of initial sample conditions and particle friction coefficient on tip resistance are investigated and found to have an important effect on the tip resistance. Biaxial test simulations using DEM are conducted to obtain the basic granular material properties for obtaining CPT analytical solutions based on continuum mechanics. Macro properties of the samples for different input micro parameters are presented and used to obtain the analytical CPT results. Comparison between the numerical simulations and analytical solutions show good agreement.

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Cone penetration tests in a virtual calibration chamber

Cited by 127 publications

References 12 publications

Steady state of solid-grain interfaces during simulated CPT

Steady state of solid-grain interfaces during simulated CPT

An approach to enhance efficiency of DEM modelling of soils with crushable grains

Discrete element modelling and cavity expansion analysis of cone penetration testing

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