The role of transgranular capability in grain-based modelling of crystalline rocks

X. F. Li, H. B. Li, J. Zhao

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Considering that many numerical methods have been developed to study the mechanical properties of rocks based on micro heterogeneities such as mineral size, morphology, composition and boundary defects, an overview of grain-based modelling is presented in this study to compare the advantages and limitations of different grain-mimicking methods. Intergranular and transgranular fracturing models and difficulties in parameter calibrations are discussed. Four typical grain models, UDEC-GBM, GB-FDEM, cluster and clump, are used to represent the two main families: block-based grains and particle-based grains with and without considering grain crushing. Subsequently, how grain crushing affects crack stresses, Hoek-Brown strength parameters m i , localized shearing and cracking transformation is simulated by these grain models. The simulated results indicate that the approaches capable of grain breakage lead to more consistent results in comparison with laboratory tests, for example, evident dilatancy in uniaxial compressive loading, high strength ratios, nonlinear failure strength envelopes and shear bands under high confinement. The role of transgranular capability is significantly important in the simulation of rock deformation using grain models.

Original languageEnglish
Pages (from-to)161-183
Number of pages23
JournalComputers and Geotechnics
Volume110
DOIs
Publication statusPublished - 1 Jun 2019

Keywords

  • Discrete element method (DEM) simulation
  • Grain crushing
  • Grain-based model
  • Heterogeneity
  • Intergranular and transgranular cracks

Cite this

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title = "The role of transgranular capability in grain-based modelling of crystalline rocks",
abstract = "Considering that many numerical methods have been developed to study the mechanical properties of rocks based on micro heterogeneities such as mineral size, morphology, composition and boundary defects, an overview of grain-based modelling is presented in this study to compare the advantages and limitations of different grain-mimicking methods. Intergranular and transgranular fracturing models and difficulties in parameter calibrations are discussed. Four typical grain models, UDEC-GBM, GB-FDEM, cluster and clump, are used to represent the two main families: block-based grains and particle-based grains with and without considering grain crushing. Subsequently, how grain crushing affects crack stresses, Hoek-Brown strength parameters m i , localized shearing and cracking transformation is simulated by these grain models. The simulated results indicate that the approaches capable of grain breakage lead to more consistent results in comparison with laboratory tests, for example, evident dilatancy in uniaxial compressive loading, high strength ratios, nonlinear failure strength envelopes and shear bands under high confinement. The role of transgranular capability is significantly important in the simulation of rock deformation using grain models.",
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author = "Li, {X. F.} and Li, {H. B.} and J. Zhao",
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The role of transgranular capability in grain-based modelling of crystalline rocks. / Li, X. F.; Li, H. B.; Zhao, J.

In: Computers and Geotechnics, Vol. 110, 01.06.2019, p. 161-183.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Li, H. B.

AU - Zhao, J.

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N2 - Considering that many numerical methods have been developed to study the mechanical properties of rocks based on micro heterogeneities such as mineral size, morphology, composition and boundary defects, an overview of grain-based modelling is presented in this study to compare the advantages and limitations of different grain-mimicking methods. Intergranular and transgranular fracturing models and difficulties in parameter calibrations are discussed. Four typical grain models, UDEC-GBM, GB-FDEM, cluster and clump, are used to represent the two main families: block-based grains and particle-based grains with and without considering grain crushing. Subsequently, how grain crushing affects crack stresses, Hoek-Brown strength parameters m i , localized shearing and cracking transformation is simulated by these grain models. The simulated results indicate that the approaches capable of grain breakage lead to more consistent results in comparison with laboratory tests, for example, evident dilatancy in uniaxial compressive loading, high strength ratios, nonlinear failure strength envelopes and shear bands under high confinement. The role of transgranular capability is significantly important in the simulation of rock deformation using grain models.

AB - Considering that many numerical methods have been developed to study the mechanical properties of rocks based on micro heterogeneities such as mineral size, morphology, composition and boundary defects, an overview of grain-based modelling is presented in this study to compare the advantages and limitations of different grain-mimicking methods. Intergranular and transgranular fracturing models and difficulties in parameter calibrations are discussed. Four typical grain models, UDEC-GBM, GB-FDEM, cluster and clump, are used to represent the two main families: block-based grains and particle-based grains with and without considering grain crushing. Subsequently, how grain crushing affects crack stresses, Hoek-Brown strength parameters m i , localized shearing and cracking transformation is simulated by these grain models. The simulated results indicate that the approaches capable of grain breakage lead to more consistent results in comparison with laboratory tests, for example, evident dilatancy in uniaxial compressive loading, high strength ratios, nonlinear failure strength envelopes and shear bands under high confinement. The role of transgranular capability is significantly important in the simulation of rock deformation using grain models.

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