Three dimensional discrete element method simulations of interface shear

Zhang, Nan; Evans, T. Matthew

doi:10.1016/j.sandf.2018.05.010

Cited by 28 publications

(15 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To facilitate the interpretation of macroscale responses, microscale metrics such as contact normal force distribution, contact networks, mobilization of friction, and particle rotation were calculated to elucidate the wall friction mechanism. The DEM simulations also exhibited a bi-linear relation between the interface resistance and normalized wall roughness [25,70]. The critical normalized roughness was found to be about 0.4 [25,77].…”

Section: Literature Overviewmentioning

confidence: 79%

“…The relationship between the values of u w,max and R n and between u w,res and R n was bilinear as, e.g. in experiments [19,48] and DEM analyses [25,70] (Fig. 8).…”

Section: Evolution Of Mobilized Wall Friction Angle and Volumetric Stmentioning

confidence: 90%

“…The peak u w,max and the residual wall friction angle u w,res rapidly increased with increasing roughness parameter up to a particular value of surface roughness (called the critical surface roughness) as in the laboratory tests by Hu and Pu [19] and Su et al [48] and DEM simulations by Jing et al [25] and Zhang and Evans [70]. In our analyses, the critical surface roughness was equal to R n(crit) = 0.50-0.75, beyond which their effect became negligible.…”

Section: Evolution Of Mobilized Wall Friction Angle and Volumetric Stmentioning

confidence: 92%

“…In [55], the boundary conditions along the horizontal rigid wall suggested inclusion of two ratios connected to the normalized wall roughness (a ratio of the micro-polar rotation multiplied by the mean grain diameter and the horizontal displacement and a ratio of the horizontal shear stress multiplied by the mean grain diameter and the horizontal couple stress). To better understand microscopic phenomena during wall friction, DEM calculations were also carried out [4,5,12,14,15,22,24,25,62,63,70,77,78]. There exist many numerical studies of wall friction using DEM under 2D conditions (e.g.…”

Section: Literature Overviewmentioning

confidence: 99%

“…There exist many numerical studies of wall friction using DEM under 2D conditions (e.g. [14,15,22,62,63,77,78]) and only a few under 3D conditions [4,5,12,24,25,70]. To facilitate the interpretation of macroscale responses, microscale metrics such as contact normal force distribution, contact networks, mobilization of friction, and particle rotation were calculated to elucidate the wall friction mechanism.…”

Section: Literature Overviewmentioning

confidence: 99%

See 4 more Smart Citations

3D DEM simulations of monotonic interface behaviour between cohesionless sand and rigid wall of different roughness

2020

View full text Add to dashboard Cite

The paper deals with three-dimensional simulations of a monotonic quasi-static interface behaviour between cohesionless sand and a rigid wall of different roughness during wall friction tests in a parallelly guided direct shear test under constant normal stress. Numerical modelling was carried out by the discrete element method (DEM) using spheres with contact moments to approximately capture a non-uniform particle shape. The varying wall surface topography was simulated by a regular mesh of triangular grooves (asperities) along the wall with a different height, distance and inclination. The calculations were carried out with different initial void ratios of sand and vertical normal stress. The focus was to quantify the effect of wall roughness on the evolution of mobilized wall friction and shear localization, also to specify the ratios between slip and rotation and between shear stress/force and couple stress/moment in the sand at the wall. DEM simulations were generally in good agreement with reported experimental results for similar interface roughness. The findings presented in this paper offer a new perspective on the understanding of the wall friction phenomenon in granular bodies.

show abstract

Section: Literature Overviewmentioning

confidence: 79%

“…The relationship between the values of u w,max and R n and between u w,res and R n was bilinear as, e.g. in experiments [19,48] and DEM analyses [25,70] (Fig. 8).…”

Section: Evolution Of Mobilized Wall Friction Angle and Volumetric Stmentioning

confidence: 90%

Section: Evolution Of Mobilized Wall Friction Angle and Volumetric Stmentioning

confidence: 92%

Section: Literature Overviewmentioning

confidence: 99%

Section: Literature Overviewmentioning

confidence: 99%

See 3 more Smart Citations

3D DEM simulations of monotonic interface behaviour between cohesionless sand and rigid wall of different roughness

2020

View full text Add to dashboard Cite

show abstract

Investigations of granular specimen size effect in interface shear box test using a micro‐polar continuum description

Bauer

Ebrahimian

2021

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Parametric studies were carried out to investigate the effects of specimen size and interface friction angle on the mechanical behaviour of a cohesionless granular material in the interface shear box test under constant normal load and plane strain conditions. For a description of the pressure and density dependent properties of granular materials such as sand, a micro-polar hypoplastic continuum model is used. Numerical simulations were performed to obtain the evolution of the deformations and the shear resistance for three different specimen lengths and interface friction angles using the finite element method in the updated Lagrange frame. Due to the presence of lateral rigid boundaries of the shear box, the deformations and the stresses became significantly inhomogeneous within the granular specimen. Correspondingly, the mobilised interface shear resistance and the deformation field within the specimen were not uniform along the interface. In the case of higher interface friction angles, the evolution of the mechanical quantities along the interface can also be influenced by the specimen size. It is shown that the calculated average friction angle mobilised along a rough interface is influenced by the shear box length and it can be lower than the prescribed one. In addition, the influence of sidewall friction inside the shear box frame was explored in terms of the response of the specimen. The results of the micro-polar hypoplastic model were also compared with those obtained from the corresponding non-polar version of the model to clarify the role of polar effects within the granular body. The numerical results provide new insights into the microstructural effects of the granular material on the mobilisation of the interface friction angle and indicate the complexities and difficulties to precisely determine and interpret the interface friction angle, obtained from the classical interface shear box experiment.

show abstract

Novel approach to apply existing constitutive soil models to the modelling of interfaces

Staubach

Macháček

Wichtmann

2022

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

A novel scheme to apply constitutive (continuum) soil models to the mechanical modelling of soil-structure interfaces is presented. Opposite to existing approaches, all normal stress components of the interface depend directly on the normal stress components of the adjacent continuum. This allows to satisfy boundary conditions not only for the continuum but also for the interface. Interface models based on Hypoplasticity with intergranular strain extension and on Sanisand (version of 2004) are formulated. They are implemented in the framework of a mortar contact discretisation technique in a finite element code, which is available for download. A numerical differentiation scheme is used to secure consistent derivatives of contact forces with respect to displacement. The performance of the proposed interface models is evaluated by comparison with data from (cyclic) simple interface shear tests and an existing (hypoplastic) interface model proposed by Stutz et al. (2016). Subsequently, a large-scale cyclic interface shear test with complex geometry is simulated using the different interface models. It is concluded that only the novel interface formulation allows to appropriately consider the boundary conditions of the large-scale interface shear test in the interface.

show abstract

Three dimensional discrete element method simulations of interface shear

Cited by 28 publications

References 50 publications

3D DEM simulations of monotonic interface behaviour between cohesionless sand and rigid wall of different roughness

3D DEM simulations of monotonic interface behaviour between cohesionless sand and rigid wall of different roughness

Investigations of granular specimen size effect in interface shear box test using a micro‐polar continuum description

Novel approach to apply existing constitutive soil models to the modelling of interfaces

Contact Info

Product

Resources

About