Numerical modeling of rock fracture and fragmentation under impact loading using discrete element method

En-an, Chi; Zhao, Mingsheng; Liu, Jun; Kang, Qiang

doi:10.1177/1687814015590295

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Rock fracturing phenomena are effectively modelled by DEM methods. DEM models have been used to, for instance, investigate fracture initiation from circular rock cavities (Tarokh et al, 2016), determine interactions between natural fractures and induced hydraulic fractures (Zhou et al, 2016), mimic hydraulic fracturing (Eshiet et al, 2012) and rock fragmentation (Chi et al, 2015), and assess the effect of macroporosity -holes in rock -on fracture pattern and rock tensile strength (Bai et al, 2016). In addition, various formulations of DEM techniques have been employed to study fracture behaviour by simulating typical laboratory based experiments used for determining rock fracture and strength properties.…”

Section: Review Of Dem Techniquesmentioning

confidence: 99%

Numerical modelling to predict fracturing rock (Thanet chalk) due to naturally occurring faults and fluid pressure

Eshiet

Welch

Sheng

2018

Journal of Structural Geology

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The fracturing process within the subsurface environment is often affected by pre-existing features such as naturally occurring faults. The interaction between these features and the propagating fractures together with their response to fluid pressure perturbations are multifaceted and in many instances not well understood. Faults play a major role in the containment of fractures and (depending on their size, configuration and mechanical properties) may instigate initiation of fractures. Outcrop mapping of a chalk cliff and wavecut platform in Thanet, Southeast England show a complex fracture pattern that seems to be controlled by meso-scale strike-slip faults within the chalk. The response of these faults to changes to in situ stress and fluid pressure is thought to control the nucleation and propagation of fractures in the chalk. In this study the DEM (Discrete Element Method) technique has been employed as a follow up to previous field and numerical (boundary and finite element method) investigations to ascertain the role of the faults in the initiation and nucleation of fractures, as well as their role in expediting or constraining further fracture proliferation. The role of fluid pressure, in-situ stress, and fault geometry are recognised as focal factors. Two fault geometries were studied: a strike-slip fault containing a releasing bend and a strike slip fault containing a restraining bend. The generation of localised areas of tensile stresses due to fluid pressure and stress perturbations have been shown to cause the initiation of fractures around the fault bends. Although this phenomenon occurs for both fault geometries, the location of the highest fluid pressure and initiation of fracture is different in each case. The dissimilarity in the fracturing process due to differences in the geometry of pre-existing faults demonstrates the significance of both fault geometry and fluid behaviour in controlling fracturing.

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Section: Review Of Dem Techniquesmentioning

confidence: 99%

Numerical modelling to predict fracturing rock (Thanet chalk) due to naturally occurring faults and fluid pressure

Eshiet

Welch

Sheng

2018

Journal of Structural Geology

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“…Therefore, laboratory experiments on artificial rock-like materials have been widely employed to understand the complex mechanical behavior of jointed rock mass. Numerous studies using physical modeling for a rock mass with limited joint sets [14][15][16][17][18] have been made. Although these studies have provided a great deal of valuable results, they generally incorporated simplifications in order to perform the tests.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and failure characteristics of rock-like material with multiple crossed joint sets under uniaxial compression

Liu

Sun

Yue

et al. 2017

Advances in Mechanical Engineering

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The strength and deformation of rock masses transected by persistent joints are controlled by the fracture network. In this work, bonded particle model modeled by particle flow code in three dimensions was used to study the effect of geometry parameters on the strength and behavior of jointed rock masses under uniaxial compression. The effect of the number of crossed joint sets, joint orientation, and joint spacing on the uniaxial compressive strength was investigated, and this article presents the results of the numerical simulations. Rigorous validation process had done before the numerical experiments. Four types of blocks (Series A, B, C, and D) with different numbers of joint sets were considered in this article. Then, a sensitivity study is undertaken to investigate the effects of joint set numbers and joint geometry configuration on the failure mode, unconfined compressive strength, and Young’s modulus of jointed rock mass. The interaction among the crossed joint sets was found to have marked effects on the mechanical properties and failure modes. A study about the effects of joint spacing on the failure modes, unconfined compressive strength, and Young’s modulus was also conducted. Joint spacing was found to have no significant effect on the failure modes of jointed rock masses in a certain range. It is also shown that the range and variance of unconfined compressive strength are affected principally by joint set numbers and decreased slightly with the decrease in joint spacing. The effect of crossed joint sets on the stress field was carried out. Stress concentration was found to be the reason for relatively lower strength of blocks with crossed joint sets compared to the block with the same weakest single joint set. The result in this article is of great help to reveal the mechanism of damage and fracture of jointed rocks under uniaxial compression.

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3D Geomechanical Modeling of Casing Collapse in Plastic Formations (Cap Rock of Hydrocarbon Reservoir)

Hedayatikhah

Abdideh

2018

Nat Resour Res

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Numerical modeling of rock fracture and fragmentation under impact loading using discrete element method

Cited by 4 publications

References 21 publications

Numerical modelling to predict fracturing rock (Thanet chalk) due to naturally occurring faults and fluid pressure

Numerical modelling to predict fracturing rock (Thanet chalk) due to naturally occurring faults and fluid pressure

Mechanical and failure characteristics of rock-like material with multiple crossed joint sets under uniaxial compression

3D Geomechanical Modeling of Casing Collapse in Plastic Formations (Cap Rock of Hydrocarbon Reservoir)

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