Discrete element modelling of the mechanical behaviour of a sand-rubber mixture containing large rubber particles

Gong, Linxian; Nie, Lei; Yan, Xu; Wang, Hong; Zhang, Tao; Du, Chao; Wang, Yuzheng

doi:10.1016/j.conbuildmat.2019.01.214

Cited by 32 publications

(8 citation statements)

References 31 publications

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“…Gong et al [ 31 ] has investigated the role of different contact type in a strong force network and has concluded that rubber–rubber contacts share a very low proportion in the strong network, and contribute less to stress transmission within the system. In this study, we investigate the role of different contact types in a different way.…”

Section: Resultsmentioning

confidence: 99%

“…The particle size distribution (PSD) of the simulated sand–rubber mixtures is similar to that of the materials reported by Deng et al [ 39 ]. Deng et al [ 39 ] and Gong et al [ 31 ] can be referred to for a brief description of the sand–rubber mixtures and the background of the laboratory testing. The particle size distribution curves of sand and rubber are shown in Figure 1 .…”

Section: Modelling Using the Discrete Element Methodsmentioning

confidence: 99%

“…Discrete element method (DEM), which was first developed by Cundall and Strack [ 30 ], has been proven to be a powerful tool in investigating the mechanical behavior of granular materials, and has been successfully applied to investigating the mechanical properties of sand–rubber mixtures [ 6 , 16 , 18 , 31 ] and to simulate the true triaxial shear tests [ 25 , 26 , 28 ]. This paper employed a three-dimensional discrete element simulation of sand–rubber mixtures with various rubber contents under true triaxial shear conditions.…”

Section: Introductionmentioning

confidence: 99%

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Discrete Element Modelling of the Mechanical Behavior of Sand–Rubber Mixtures under True Triaxial Tests

Liu

Liao

et al. 2020

Materials

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Sand–rubber mixtures (SRMs) consisting of stiff sand particles and soft rubber particles are typical binary mixture materials that possess a variety of complicated properties. The complexity of the properties of sand–rubber mixtures is increased when complex stress path is involved. This study investigates the mechanical behavior of sand–rubber mixtures under generalized loading conditions using the discrete element method. A series of numerical true triaxial shear tests were conducted on pure sand and sand–rubber mixtures. The effect of rubber content and loading path on both of the macroscopic and microscopic performances of sand–rubber mixtures was investigated, and the associated microscale mechanism was also discussed. Numerical simulations show that the relationship between the peak friction angle ϕp and the intermediate principal stress ratio b is influenced by the addition of rubber particles, and a suggested explanation of this phenomenon is that the rubber particles mainly affect the inherent stability of the strong network. Particle-scale observations, including the coordinate number, the proportion of strong contacts, and the fabric anisotropy, are also presented in this study. Microscopic results confirm the explanation above, and explore the force transmission characteristics of sand–rubber mixtures under generalized loading conditions. This research can provide a reference for the constitutive model development of sand–rubber mixtures.

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Section: Resultsmentioning

confidence: 99%

Section: Modelling Using the Discrete Element Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Discrete Element Modelling of the Mechanical Behavior of Sand–Rubber Mixtures under True Triaxial Tests

Liu

Liao

et al. 2020

Materials

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“…Bardet [27] and ODA [28] believed that particle rotation is very important for the evolution of mesostructure. Gong et al [29] revealed that the increasing number of rubber particles would change the friction and coordination number between particles, affecting the sliding and rotation between particles by numerical simulations of triaxial tests of SRM samples. Liu [30] used the particle micro rotation theory to construct the finite element model and studied the influence law of the micro rotation of soil particles on the macro mechanical response.…”

Section: Introductionmentioning

confidence: 99%

Influence mechanism of particle size on macro-meso deformation of particle accumulation under graded loading

zhiqi

Yang

Pei

et al. 2022

Preprint

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The sedimentation of particle accumulation caused by the overlying load exerts serious effects. In order to study the particle transport mechanism of sand granular material accumulation during sedimentation, the micro glass beads (MGB) are selected as the experimental research object. Glass bead particles with five size ranges are selected for graded loading test, and their mechanical properties and deformation mechanism under triaxial loading are analyzed by discrete element method (DEM). The experimental results show that with the increase of axial load, the deformation of glass beads gradually increases, the porosity gradually decreases, and the strain difference in the loading stage increases exponentially. Under the same load, the deformation of particle accumulation increases with the enlargement of bead size. The discrete element method results show that with the increase of axial load, the rotation angle and the maximum speed at all levels of beads gradually increase, the rotation angle difference at all loading stages increases, and the rotation angle and speed are also raised with the increase increasing particle size. Combined with the test and discrete element method analysis, it can be obtained that the increase of the accumulation strain difference of beads during loading is mainly due to the improved rotation of particles. With the increase of load, the rotation angle of beads increases and the displacement caused by rotation increases. With the increase of particle size, the porosity between beads increases, the coordination number decreases, the anti-rotation ability between beads decreases, and the rotation of particles is promoted, resulting in greater strain difference of accumulation.

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“…Composed of two types of grains (i.e., sand grains and rubber grains) with substantially different stiffnesses, SRMs generally have more complex mechanical behaviour than pure sands. The complexity stems from the existence of multiple load-transferring mechanisms including loads transferring through sand-sand contacts, sand-rubber contacts and rubber-rubber contacts within SRMs [3][4][5][6]. This intrinsic feature of SRMs has dominated the fact that their mechanical behaviour is affected by various factors including rubber content, rubber shape and size as well as soil types.…”

Section: Introductionmentioning

confidence: 99%

Exploring the micromechanical behaviour of sand-rubber mixtures using X-ray micro-tomography

Cheng

Wang

2021

EPJ Web Conf.

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The micromechanical behaviour of sand-rubber mixtures (SRMs) under monotonic triaxial shear were investigated using X-ray micro-tomography. The localisation of sand particle rotations that occurred in a pure sand sample under shear was inhibited in the sand mixed with 30% rubber grains by mass. Meanwhile, the SRMs exhibited an evolution of sand-sand contact coordination number that is not negatively correlated with sample porosity, dramatically different from that was observed in pure sands. Substantially increasing anisotropy degree of sand-rubber contacts compared with minor changes of sandsand contact fabric was observed, implying the increasingly important role of sand-rubber contacts in the transmission of deviatoric loads as the shear of SRMs progressed.

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Discrete element modelling of the mechanical behaviour of a sand-rubber mixture containing large rubber particles

Cited by 32 publications

References 31 publications

Discrete Element Modelling of the Mechanical Behavior of Sand–Rubber Mixtures under True Triaxial Tests

Discrete Element Modelling of the Mechanical Behavior of Sand–Rubber Mixtures under True Triaxial Tests

Influence mechanism of particle size on macro-meso deformation of particle accumulation under graded loading

Exploring the micromechanical behaviour of sand-rubber mixtures using X-ray micro-tomography

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