Grain crushing and high-pressure oedometer tests simulated with the discrete element method

Laufer, Imre

doi:10.1007/s10035-015-0559-z

Cited by 49 publications

(11 citation statements)

References 42 publications

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“…Such a compression behavior was also observed for arbitrary granular materials and it is also verified by numerical simulations with the discrete element method, e.g. [71,72]. Experimental work has shown that the pressure at the point of inflection depends mainly on the mineral composition and the state of weathering of the solid material.…”

Section: Introduction Of the Solid Hardness In The Sense Of A Continusupporting

confidence: 55%

Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Bauer¹

2021

Dam Engineering - Recent Advances in Design and Analysis

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For the long-term behavior and safety assessment of rockfill dams, not only the shape of the dam body, the loading history, the geological condition of the dam foundation and abutments, the assessment of possible seismic hazards and seepage events caused by defects of the sealing are important, but also the time dependent mechanical behavior of the dam materials used can be of significant influence. In this paper a novel hypoplastic constitutive model for moisture sensitive, coarse-grained rockfill materials is presented. In the constitutive equations, the so-called solid hardness is a key parameter to reflect the influence of the state of weathering on the mechanical response. With respect to the evolution equation for the solid hardness, creep and stress relaxation can be modeled for dry and wet states of the material in a unified manner. The performance of the model is demonstrated by comparing the numerical simulation with experimental data.

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Section: Introduction Of the Solid Hardness In The Sense Of A Continusupporting

confidence: 55%

Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Bauer¹

2021

Dam Engineering - Recent Advances in Design and Analysis

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“…Cheng et al [22] randomly removed 20% of elementary balls in an agglomerate to provide a statistical variability to the strength of the agglomerates. Laufer [38] investigated high-pressure compression tests on brittle grains and found that the crushing strengths of the grains are directly proportional to the bond strengths, including normal distributed bond strengths, degraded bonds, and uniformly increased/decreased bond strengths. In this study, increased bond strengths of tensile strength (σ c ) and cohesion (c) were set to get the random strength of the agglomerates.…”

Section: Dem Methods For a Sand Samplementioning

confidence: 99%

Numerical Simulation of Particle Breakage of Granular Assemblies in Discrete Element Analyses

Zhang

2019

Advances in Civil Engineering

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This paper presents numerical simulations of high-pressure biaxial tests on breakable granular soils with the discrete element method. The 2D setting is more economic in terms of computational cost, which allows simulation with a larger number of particles with a wider size distribution. The results of breakable and unbreakable agglomerates show that particle breakage has a significant influence on the macro- and micromechanical behaviors of the assembly. Higher confining pressure and larger axial strain result in the variation of particle grading and agglomerate numbers. The evolution of bond breakage during shearing makes it possible to trace the failure process and breakage mechanism at the microlevel. The breakage energy is found to account for a small fraction of total energy input compared with friction energy. A hyperbolic correlation between relative particle breakage and total energy input per unit volume was established regardless of the influence of confining pressure.

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“…To date, several different approaches have been used to model post-grain failure using PFC (Cil & Alshibli, 2014;Couroyer et al, 2000;Fu et al, 2017;Laufer, 2015;Marketos & Bolton, 2009;Sun et al, 2018;B. Wang et al, 2008).…”

Section: Grain Failure Modelmentioning

confidence: 99%

Compaction of the Groningen Gas Reservoir Sandstone: Discrete Element Modeling Using Microphysically Based Grain‐Scale Interaction Laws

2021

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Reservoir compaction, surface subsidence and induced seismicity are often associated with prolonged hydrocarbon production. Recent experiments conducted on the Groningen gas field's Slochteren sandstone reservoir rock, at in-situ conditions, have shown that compaction involves both poro-elastic strain and time-independent, permanent strain, caused by consolidation and shear of clay films coating the sandstone grains, with grain failure occurring at higher stresses. To model compaction of the reservoir in space and time, numerical approaches, such as the Discrete Element Method (DEM), populated with realistic grain-scale mechanisms are needed. We developed a new particle-interaction law (contact model) for classic DEM to explicitly account for the experimentally observed mechanisms of non-linear elasticity, intergranular clay film deformation, and grain breakage. It was calibrated against both hydrostatic and conventional triaxial Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Grain crushing and high-pressure oedometer tests simulated with the discrete element method

Cited by 49 publications

References 42 publications

Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Numerical Simulation of Particle Breakage of Granular Assemblies in Discrete Element Analyses

Compaction of the Groningen Gas Reservoir Sandstone: Discrete Element Modeling Using Microphysically Based Grain‐Scale Interaction Laws

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