Effect of the characteristics of granular media on dynamic penetration test - Numerical study using 2D - DEM

Tran, Quoc Anh; Chevalier, Bastien; Breul, Pierre

doi:10.1051/epjconf/201714016004

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…In order to validate the method applied to the Panda 3 R and better understand the mechanism of penetration involved in this kind of test, there are many numerical studies based on Discrete Element Method (DEM) in two dimensions (2D) [2,[4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Modeling of light dynamic cone penetration test – Panda 3 ® in granular material by using 3D Discrete element method

Tran

Chevalier

Benz³

et al. 2017

EPJ Web Conf.

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Abstract. The recent technological developments made on the light dynamic penetration test Panda 3 R provide a dynamic load-penetration curve σ p − s p for each impact. This curve is influenced by the mechanical and physical properties of the investigated granular media. In order to analyze and exploit the load-penetration curve, a numerical model of penetration test using 3D Discrete Element Method is proposed for reproducing tests in dynamic conditions in granular media. All parameters of impact used in this model have at first been calibrated by respecting mechanical and geometrical properties of the hammer and the rod. There is a good agreement between experimental results and the ones obtained from simulations in 2D or 3D. After creating a sample, we will simulate the Panda 3 R . It is possible to measure directly the dynamic load-penetration curve occurring at the tip for each impact. Using the force and acceleration measured in the top part of the rod, it is possible to separate the incident and reflected waves and then calculate the tip's load-penetration curve. The load-penetration curve obtained is qualitatively similar with that obtained by experimental tests. In addition, the frequency analysis of the measured signals present also a good compliance with that measured in reality when the tip resistance is qualitatively similar.

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Section: Introductionmentioning

confidence: 99%

Modeling of light dynamic cone penetration test – Panda 3 ® in granular material by using 3D Discrete element method

Tran

Chevalier

Benz³

et al. 2017

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

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Numerical verification of the continuous calculation method for tip stress during the driving process of the dynamic penetration test

Tran

Chevalier

Benz-Navarrete³

et al. 2019

Soils and Foundations

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This paper presents a calculation method for obtaining the continuous variation in stress between the tip and the soil during dynamic penetration tests, particularly in the case of using the Panda 3 Ò penetration testing device. The originality of the method is that the tip stress can be computed continuously throughout the driving process. For each impact of the hammer on the penetrometer, data are recorded by sensors located at the top of the apparatus. Then, the stress at the tip and the displacement of the apparatus are calculated with a method based on the propagation of waves in the device. A three-dimensional numerical model of the penetration test, based on the Panda 3 Ò specifications and using the discrete element method (DEM), is proposed in this paper. The purpose of the simulations is to validate the calculation method by comparing the curves of the tip stress versus the penetration distance obtained in two different ways, the first being the distance directly observed at the tip and the second being the distance calculated from the data recorded at the top of the penetrometer, as with the experimental device. The entire apparatus is represented, including the hammer, the rod, and the tip, and is driven into the model soil. The calculation method is applied, and the results are compared to the actual response of the soil to the driving of the penetrometer directly at the tip, which can be obtained with the numerical model. The responses are found to be very similar, confirming the theoretical framework and its underlying assumptions. This method is applied to dynamic penetration tests and provides the opportunity to obtain mechanical parameters other than the tip resistance from the tests.

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Effect of the characteristics of granular media on dynamic penetration test - Numerical study using 2D - DEM

Cited by 2 publications

References 5 publications

Modeling of light dynamic cone penetration test – Panda 3 ® in granular material by using 3D Discrete element method

Modeling of light dynamic cone penetration test – Panda 3 ® in granular material by using 3D Discrete element method

Numerical verification of the continuous calculation method for tip stress during the driving process of the dynamic penetration test

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