Influence of the rolling-resistance-based shape of coarse particles on the shear responses of granular mixtures

Published on Oct 1, 2020in Particuology3.067
路 DOI :10.1016/J.PARTIC.2019.12.004
Yangui Zhu5
Estimated H-index: 5
(CSU: Central South University),
Zhihong Nie10
Estimated H-index: 10
(CSU: Central South University),
Jian Gong2
Estimated H-index: 2
(CSUST: Changsha University of Science and Technology)
Source
Abstract
Abstract Shear responses of dense granular mixtures of spherical coarse particles with the rolling resistance and spherical fine particles are studied via triaxial compression tests using the discrete element method. The macroscale responses (shear strength and dilatancy) are examined. Comparing the results with those in the literature indicates that granular mixtures with a rolling resistance coefficient of 0.5 have similar macroscale responses to those of gravel-shaped coarse particle mixtures. We quantify the microscale responses including the percentage contributions of contact types, partial coordination number, average particle rotation, average degree of interlocking, and local structural properties. A detailed analysis of the force鈥揻abric anisotropy reveals the mechanisms of the variations in the shear strength with the rolling resistance coefficient and the fines content. The mechanism of the variation in the shear strength with the fines content for granular mixtures with a rolling resistance coefficient of 0.5 is different from that for gravel-shaped coarse particle mixtures. Finally, we find that a rolling resistance linear model weakens the linear relationship between the stress ratio and the fabric anisotropy of strong and non-sliding contacts when the fines content is 30% and 40%.
馃摉 Papers frequently viewed together
References52
Newest
#1Jian Gong (DUT: Dalian University of Technology)H-Index: 10
#2Jun Liu (DUT: Dalian University of Technology)H-Index: 5
Last. Liang Cui (University of Surrey)H-Index: 18
view all 3 authors...
The shear behaviors of granular mixtures are studied using the discrete element method. These granular materials contain real gravel-shaped coarse particles and spherical fine particles. Dense samples have been created by the isotropic compression method. The samples are then sheared under drained triaxial compression to a large strain to determine the peak and residual shear strengths. The emphasis of this study is placed on assessing the evolutions of contributions of the coarse-coarse (CC) co...
Source
#1Zhihong Nie (CSU: Central South University)H-Index: 10
#2Yangui Zhu (CSU: Central South University)H-Index: 5
Last. Liu Shunkai (CSU: Central South University)H-Index: 3
view all 5 authors...
Abstract This study explores the effects of the size ratio and fines content on the internal stability of binary mixtures using the discrete element method. First, microscopic characteristics, including the particle contact, stress and local structure, are carefully examined. Then, internal stability evaluations of binary mixtures are carried out using two existing stability criteria, which are not consistent with the microscopic characteristics. Lastly, a new stability criterion for evaluating ...
Source
#1Zhihong Nie (CSU: Central South University)H-Index: 10
#2Yangui Zhu (CSU: Central South University)H-Index: 5
Last. Jian Gong (CSU: Central South University)H-Index: 10
view all 4 authors...
This report investigates the effects of Fourier-based particle shape on the macroscopic and microscopic shear responses of rockfill material via a series of numerical biaxial compression tests. The multi-disk method is employed to model two-dimensional irregular rockfill particles. The macroscopic characteristics, including the shear strength and the dilatancy response, and the microscopic characteristics, including the contact force, the coordination number and the sliding contact, are examined...
Source
#1Jian Gong (CSU: Central South University)H-Index: 10
#2Zhihong Nie (CSU: Central South University)H-Index: 10
Last. Xiang Wang (CSU: Central South University)H-Index: 9
view all 5 authors...
Abstract This report explores the effects of particle shape and content of fines on the shear behavior of sand-fines mixtures using a two-dimensional discrete element method. The contributions of different contact types to the residual shear strength are quantified. Microscopic analysis of each contact type, including coordination number, normal contact force and their contributions to the principal stress components, reveals why the contribution of each contact type to the residual shear streng...
Source
#1Wei Zhou (WHU: Wuhan University)H-Index: 23
Abstract Binary granular mixtures are comprehensively explored from both macro- and microscopic perspectives. In this study, the undrained behavior of binary granular mixtures constituted by fine and coarse particles is investigated using the discrete element method (DEM) under different fines contents (FCs). The peak deviatoric stress ratio has a linear relation with the effective void ratio. The increase in the FC to a certain value (approximately 10% in this work) can change the material resp...
Source
#1Shiwei Zhao (SCUT: South China University of Technology)H-Index: 13
#2T. Matthew Evans (OSU: Oregon State University)H-Index: 21
Last. Xiaowen Zhou (SCUT: South China University of Technology)H-Index: 9
view all 3 authors...
Abstract The rolling resistance model has been employed in the discrete element modelling in geomechanics, as an alternative computationally efficient approach to capture the resistance of particle rotation due to irregularity in shape. This paper presents a series of 3D DEM simulations of triaxial compression tests on specimens with rolling resistance and non-spherical particles using an in-house code. The non-spherical particle shapes are two kinds of special super-ellipsoids (i.e., superballs...
Source
#1Liu Yiming (HUST: Huazhong University of Science and Technology)H-Index: 3
The effects of rolling resistance on the stress-dilatancy behavior and fabric anisotropy of granular materials were investigated through a three-dimensional discrete element method (DEM). A rolling resistance model was incorporated into the DEM code PFC3D and triaxial DEM simulations under simulated drained and undrained conditions were carried out. The results show that there existed a threshold value of the rolling friction. When the rolling friction was smaller than this value, the mechanical...
Source
#1Shiwei Zhao (SCUT: South China University of Technology)H-Index: 13
#2T. Matthew Evans (OSU: Oregon State University)H-Index: 21
Last. Xiaowen Zhou (SCUT: South China University of Technology)H-Index: 9
view all 3 authors...
Abstract The internal structure of a sheared assembly of monodisperse ellipsoids is investigated using three-dimensional Voronoi analysis. The discrete element method is employed to simulate isotropic and triaxial compression tests of ellipsoidal particles. A recently developed Voronoi tessellation technique, i.e., Set Voronoi tessellation, is applied to constructing Voronoi cells of assemblies at a series of shearing states. Several quantities are provided to quantify the properties of Voronoi ...
Source
#1Adnan SufianH-Index: 6
#2Adrian R. RussellH-Index: 27
Last. Andrew J. WhittleH-Index: 44
view all 3 authors...
The anisotropy associated with the contact network in granular media is investigated. A unique expression for mobilised internal friction has been discovered using numerical simulations of monodisperse and polydisperse spherical assemblies under two-way cyclic axisymmetric and simple shear load paths. This uniqueness is described by a linear relationship between the macroscopic stress ratio and the geometric configuration of only the strong and non-sliding contacts, where strong contacts are tho...
Source
#1Ye Lu (SHU: Shanghai University)H-Index: 10
#2Yong Tan (Tongji University)H-Index: 21
Last. Chunan Liu (Tongji University)H-Index: 1
view all 4 authors...
AbstractThe mechanical behaviors of gravelly sands are greatly affected by the morphology and size of gravel grains. In this paper, a systematic approach that integrated computational geometry was ...
Source
Cited By4
Newest
#1Zhihong Nie (CSU: Central South University)H-Index: 10
#2Qun Qi (CSU: Central South University)
Last. Aijun AnH-Index: 2
view all 5 authors...
Volcanic cinder is a low-cost subgrade fill material in East Africa. A reluctance to use volcanic cinders for subgrades in the past has stemmed from the compactness is substandard and variable. Con...
Source
#1Zhihong Nie (CSU: Central South University)H-Index: 10
#2Qun Qi (CSU: Central South University)
Last. Yangui Zhu (CSU: Central South University)H-Index: 5
view all 4 authors...
Abstract null null The strain characteristic and load transmission of mixed granular matter are different from those of homogeneous granular matter. Cyclic loading renders the mechanical behaviours of mixed granular matter more complex. To investigate the dynamic responses of gravel鈥搒and mixtures, the discrete element method (DEM) was used to simulate the cyclic loading of gravel鈥搒and mixtures with low fines contents. Macroscopically, the evolution of the axial strain and volumetric strain was i...
Source
Graded crushed stone (GCS), as a cheap and essential component, is of great importance in road construction. The irregularity and variability of particle shape is known to affect the packing characteristics of GCS, such as compactness and void ratio. In this study, the realistic particle outline is first automatically extracted based on digital image processing and deep learning algorithms. Then, the elongation (EI), roundness (Rd), and roughness (Rg) of GCS are quantified by shape evaluation al...
Source
#2Emilien Az茅ma (Institut Universitaire de France)H-Index: 23
Source
#1Yangui Zhu (CSU: Central South University)H-Index: 5
#2Jian Gong (CSU: Central South University)H-Index: 10
Last. Zhihong Nie (CSU: Central South University)H-Index: 10
view all 3 authors...
Abstract The coarse particles in mixed soils can be cobbles or gravels, with the main difference being their roundness (an indicator describing particle shape characteristics at an intermediate scale). The influence of coarse particle shape (i.e., roundness) on the macroscopic and microscopic shear behaviours of cohesionless mixed soils with various fines contents (FCs) was investigated via the discrete element method in this study. The shapes of coarse particles were formed using the rotation-i...
Source
#1Nick Barnett (UniSA: University of South Australia)H-Index: 2
#2Mizanur Rahman (UniSA: University of South Australia)H-Index: 52
Last. Hoang Bao Khoi Nguyen (UniSA: University of South Australia)H-Index: 6
view all 4 authors...
The discrete element method (DEM) has been extensively used to capture the macroscopic and particulate response of granular materials. Although particle rolling (i.e. controlled by rolling resistance) has been acknowledged as a major contributing factor towards micro-mechanical behaviour of idealized spherical granular material, its influence on characteristic behaviour has not been thoroughly investigated within critical state soil mechanics (CSSM) framework. For instance, the influence of part...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.