Preliminary experimental study on three-dimensional contact behavior of bonded granules

Jiang, Mingjing; Jin, Shulou; Shen, Zhifu; Liu, W; Coop, M. R.

doi:10.1088/1755-1315/26/1/012007

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…An early study by Jiang et al (2012) reported on the response of aluminium alloy rods bonded with epoxy adhesive under combined normal force, shear force and moment, with a primary focus on examining the differences in the mechanical behaviour between thick and thin bonds. Jiang et al (2015) further extended the work to three dimensional contacts using aluminium hemispheres with elastic properties matching that of quartz sand. These hemispheres were bonded with epoxy adhesive.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical behaviour in shearing of reproduced flat LBS grains with strong and weak artificial bonds

et al. 2020

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The shearing behaviour of reproduced flat LBS grains artificially bonded with ordinary Portland cement (OPC) and Plaster of Paris (PP) was examined using micromechanical experiments.Monotonic shearing tests showed a distinct variation in the load-displacement relationship at low, medium and high normal loads and a non-linear shear strength envelope was proposed. For OPC bonded sand grains, a brittle-ductile transition at 20-30 N normal load was observed and three breakage mechanisms in shearing (chipping, shear cracks, and crushing) were distinguished in accordance with the changes in the load-displacement curves. OPC bonded sands showed a predominant dilation at lower normal loads, whereas PP bonded sands were highly compressive. Based on previously published works using element-scale tests, a new mechanism for dilation under micromechanical testing was proposed in the study. Cyclic shearing tests were conducted on OPC bonded sands and the effects of increased displacement amplitude and normal load were highlighted.

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Section: Introductionmentioning

confidence: 99%

Micromechanical behaviour in shearing of reproduced flat LBS grains with strong and weak artificial bonds

et al. 2020

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“…In DEM simulations of cemented geomaterials, an important input is the contact model for bonded grains (e.g., Jiang, Yu, and Harris 2006;Jiang and Murakami 2012), the validation of which would typically require complex load path tests, including normal and shear forces and moments. However, over recent years, there has been only limited work concerning the micromechanics of bonded grains (Jiang et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

The Development of a Micromechanical Apparatus Applying Combined Normal–Shear–Bending Forces to Natural Sand Grains with Artificial Bonds

Wang

Coop

Senetakis

2018

Geotechnical Testing Journal

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Natural soils are often cemented, and there has been a need to better understand and properly model their behavior for the safe design and assessment of critical infrastructure. This necessitates the study of cemented soils at the scale of the grain. In this study, a new-generation apparatus is presented that is capable of conducting complex load path tests on two natural sand grains cemented with an artificial bonding component. Thus, the apparatus gives the opportunity to obtain insights into the micromechanics of cemented soils/weak rocks and contribute to the development of more accurate models to be utilized in the discrete element analysis of geomaterials. Apart from the presentation of the major technical features of the new apparatus, a description of the methods which were used for specimen preparation and mounting, as well as a preliminary set of experiments, are presented and discussed in this note.

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“…where , , are the peak shear, bending and torsional loads, respectively. Details of these parameters can be referred in [10] (Jiang et al, 2015b).…”

Section: Force-displacement Relationship and Strength Criterion Of Thmentioning

confidence: 99%

DEM investigation on dissociation characteristics of methane hydrate bearing sediments by chemical injection method

Jiang

Sun

2020

JGS Special Publication

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Methane hydrate (MH) is regarded as a potential future clean energy source, which has attracted lots of attention in recent decades. The sediment containing MH is called as Methane Hydrates Bearing Sediment (MHBS). The evolutions of mechanical behaviors of MHBS from macro and micro scales are needed in detail for safe MH exploitation (e.g., chemical injection method). For this purpose, a novel 3D thermo-hydro-mechanical-chemical (THMC) bond contact model was proposed and implemented into a DEM commercial software to capture the mechanical behavior of MHBS under exploitation stress path. Firstly, MHBS samples were compressed to different deviator stress levels, which represents the different initial stress state. Then the chemical injection process was simulated by increasing the salinity from 3wt% to 14wt% to allow MH dissociate while the deviator stress remained constant. After which, the recovery stage was simulated by decreasing the salinity from 14wt% to 3wt%. The results show that the salinity can affect the mechanical behavior of MHBS by changing the properties of inter-particle methane hydrate. During chemical injection process, the axial strain increases with the increase of salinity. The chemical injection method will result in soil collapse when initial deviator stress is larger than the strength of pure sand at exploitation stage but slight deformation at recover stage.

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Preliminary experimental study on three-dimensional contact behavior of bonded granules

Cited by 9 publications

References 15 publications

Micromechanical behaviour in shearing of reproduced flat LBS grains with strong and weak artificial bonds

Micromechanical behaviour in shearing of reproduced flat LBS grains with strong and weak artificial bonds

The Development of a Micromechanical Apparatus Applying Combined Normal–Shear–Bending Forces to Natural Sand Grains with Artificial Bonds

DEM investigation on dissociation characteristics of methane hydrate bearing sediments by chemical injection method

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