Experiments and 3D DEM of Triaxial Compression Tests under Special Consideration of Particle Stiffness

Ahlinhan, Marx Ferdinand; Houehanou, Ernesto C.; Koube, Marius Bocco; Doko, Valéry; Alaye, Quirin; Sungura, Nicholas; Adjovi, Edmond

doi:10.4236/gm.2018.84004

Cited by 8 publications

(3 citation statements)

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“…A total number of 5,155 particles were observed to be enough to fill the volume of the material vessel. Particles were positioned inside the material vessel through gravity deposition method [3]. In the gravity deposition method, generated particles were let to fall inside the material vessel with the effect of gravitational acceleration (9.8 m/s 2 ).…”

Section: Model Developmentmentioning

confidence: 99%

“…A microparameter will be introduced later to account for the effects of the angularity of particles on the behavior of the rockfill. Gravity deposition method was the packing methodology followed to position the particles inside the shear box [3]. There are a total of 8,317 particles inside the large-scale shear box.…”

Section: Model Developmentmentioning

confidence: 99%

“…DEM is a useful tool for simulating physical processes that involve the separation of material constituent particles [2]. It has been used effectively in various fields like construction and building materials, agricultural, geotechnical, mining, mechanical, and industrial engineering [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Discrete Element Model Parameters to Simulate Slope Movements

Adajar¹,

Ubay²,

Alfaro³

et al. 2020

GEOMATE

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Discrete Element Method (DEM) is a numerical technique that uses particulate mechanics in simulating the discontinuous behavior of particulate materials. DEM presents the advantage of modelling those materials in a particulate level allowing specifications of particle geometry including how their contacts interact. However, identifying microparameters that can accurately simulate the behavior of particulate materials is challenging. This paper presents the calibration of the microparameters of materials used in an earthfill dam that experienced slope movements. The main components of the earthfill dam under study were clay, for the core and blanket, and rockfill materials, for the protective shell. Linear parallel-bond model (LPBM) was used to describe the interactions between clay particles. Microparameters involved with the LPBM were particle stiffness, friction coefficient, bond strength, and bond stiffness. A triaxial test DEM model was developed to calibrate the clay microparameters, and it was successful in simulating the measured macroscopic peak and critical state behavior of clay materials. Rolling resistance linear model was used to describe the interactions between rockfill particles. Microparameters associated with the rolling resistance linear model were particle stiffness, friction coefficient, and rolling resistance coefficient. Large-scale direct shear test was simulated to calibrate rockfill microparameters, and it was able to capture the measured macroscopic shear behavior of rockfill materials. Calibration methodologies performed were successful in identifying appropriate microparameters for both rockfill and clay materials. The calibrated microparameters are beneficial in the development of a DEM model that can analyze movements and landslides in the vicinity of the earthfill dam or other earthfill dams built with similar materials.

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Section: Model Developmentmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%