Modelling of deformable structures in the general framework of the discrete element method

Effeindzourou, Anna; Thoeni, Klaus; Giacomini, A.; Kneib, François

doi:10.1016/j.geotexmem.2015.07.015

Cited by 50 publications

(30 citation statements)

References 22 publications

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“…Aiming at an approach that captures the continuous nature of the elements that compose the reinforcement but without the problems described above, the numerical representation of the geogrid was performed based on the method proposed by [10] for the discrete modelling of deformable objects with arbitrary geometries. The method is an extension of the technique introduced by [11] and later used by [12] in three-dimensional modelling of plant roots.…”

Section: Geogridmentioning

confidence: 99%

Geogrid pull-out modelling using DEM

2019

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With the advancement of the use of synthetic reinforcements in geotechnics, a greater understanding of the mechanisms involved in soil-reinforcement interaction is the focus of major research centres on the subject. The topic of this study is the shearing behaviour at interfaces between granular materials and geogrids. The main objective is to provide a more fundamental understanding of some micromechanisms present in this type of interface, which in turn are important to optimize the design of such reinforcement. The numerical modelling of these reinforced structures must deal with the complexity of the material-reinforcement interaction problem; therefore, it requires specific numerical models whose formulations admit localized behaviours in the contacts as well as the granular nature of the material (e.g., soil, gravel, ballast). A robust and flexible way of modelling this problem is through the Discrete Element Method (DEM). The DEM proposes to model this granular nature by representing the soil as interacting constituent particles, whose behaviour is ruled by physical laws defined at the contact points. The numerical approach is desirable since it allows, in an articulated and relatively fast way, studying closely different regions of the interface, in order to identify factors and variables that are important for the problem. The purpose involves the DEM for a 3D modelling of a geogrid pull-out test to calculate the magnitude of forces in different elements of the geogrid (i.e., nodes, longitudinal and transverse members). Preparation of numerical samples has a particular importance in the final results of simulations. Thus, the numerical techniques used to obtain better geometry for the geogrid and a granular assembly with a representative grain rolling effect are also presented in this paper.

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Section: Geogridmentioning

confidence: 99%

Geogrid pull-out modelling using DEM

2019

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“…It has also been used to model deformable structures (e.g. Bertrand et al, 2012;Effeindzourou et al, 2016).…”

Section: Discrete Element Modelmentioning

confidence: 99%

Dynamic analysis of wooden rockfall protection structures subjected to impact loading using a discrete element model

Olmedo¹,

Bourrier²,

Bertrand

et al. 2018

European Journal of Environmental and Civil Engineering

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Wooden structures made of felled trees are used in forested slopes as protection structures against rockfall. A model based on the Discrete Element Method is developed to analyse their response to normal impacts of blocks. The interaction between the blocks and the stems and the stem response are explicitly integrated. After the model calibration using impact tests, a wide range of impact scenarii representative of real configurations is explored. The influence of three parameters (stem diameter, impact velocity and block diameter) is analysed.Three impact types were identified for different ratios RD between the block and stem diameters. For small RD , the impact is limited to a brief contact. For intermediate RD, successive contacts of similar duration are observed. After the last contact, the block is sent back with a large velocity. For large RD, two contacts are observed. The second contact can be assimilated to a quasi-static loading of the stem. In addition, structure damage increases for increasing RD ranging from almost no damage for the first impact type to rupture of the stem for the third type. The largest RD associated with the first impact type is the target configuration that favors block energy decrease and limits structure damage.

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“…Cylinder elements were first introduced by Bourrier et al and can be used to simulate wires in a mesh . The cylinder elements are a beam‐like element in YADE that can handle tension, bending, and twisting . Compared with cylinder elements, the use of particle elements results in a steel mesh model that ignores wire bending.…”

Section: Introductionmentioning

confidence: 99%

“…29,30 The cylinder elements are a beam-like element in YADE that can handle tension, bending, and twisting. 31 Compared with cylinder elements, the use of particle elements results in a steel mesh model that ignores wire bending. However, after calibration, a particle-based mesh model (Bertrand et al 9 and Thoeni et al 23 ) can closely simulate the tensile and punching behavior of steel mesh.…”

Section: Introductionmentioning

confidence: 99%

Discrete element analysis of the influence of bolt pattern and spacing on the force‐displacement response of bolted steel mesh

Tannant

Zheng

2019

Num Anal Meth Geomechanics

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Summary Steel wire mesh held by a pattern of bolts can be used to stabilize a rock slope. Knowledge of the force‐displacement response of steel mesh is essential in the design of this support system. Laboratory tests have been used to test mesh that is held to rigid steel frames. These testing conditions differ from how steel mesh is held in the field by bolts. The existing laboratory test data may underestimate the deformation and overestimate the load‐bearing capacity of the steel mesh. This paper focuses on the response of the high tensile strength steel mesh held by commonly used bolt patterns. Discrete element models were used to study the force‐displacement response of the steel mesh pinned by bolts. The influences of different bolt patterns and varying ratios of bolt spacing on the effectiveness of steel wire mesh were analyzed. Relationships between the resistance force of steel mesh and bolt density at various mesh deformations were developed. These relationships can help engineers choose the bolt spacing and provide an estimate of the resistance force that a steel mesh can mobilize at a desired deformation limit for a given bolt pattern.

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Modelling of deformable structures in the general framework of the discrete element method

Cited by 50 publications

References 22 publications

Geogrid pull-out modelling using DEM

Geogrid pull-out modelling using DEM

Dynamic analysis of wooden rockfall protection structures subjected to impact loading using a discrete element model

Discrete element analysis of the influence of bolt pattern and spacing on the force‐displacement response of bolted steel mesh

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