Validation of a three-dimensional Finite-Discrete Element Method using experimental results of the Split Hopkinson Pressure Bar test

Rougier, Esteban; Knight, Earl E.; Broome, Scott Thomas; Sussman, A. J.; Munjiza, Ante

doi:10.1016/j.ijrmms.2014.03.011

Cited by 146 publications

(83 citation statements)

References 17 publications

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“…Extensive developments and applications of the FEMDEM method have been conducted in the past decade or so with different versions having emerged such as the code collaboratively developed by Queen Mary University of London (UK) and Los Alamos National Laboratory in the USA (Munjiza et al 2011(Munjiza et al , 2013Rougier et al 2014), the YGeo and Irazu by the University of Toronto, Canada (Mahabadi et al 2012;Lisjak and Grasselli 2014;Lisjak et al 2017), and the Solidity platform by Imperial College London (Xiang et al 2009a, b;Guo et al 2016;Lei 2016;Lei et al 2016). The FEMDEM model that accommodates the finite strain elasticity coupled with a smeared crack model is able to capture the complex behaviour of fractured rocks involving deformation, displacement, rotation, interaction, fracturing and fragmentation.…”

Section: Finite-discrete Element Methods (Femdem)mentioning

confidence: 99%

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

et al. 2017

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A study about the influence of polyaxial (true-triaxial) stresses on the permeability of a three-dimensional (3D) fractured rock layer is presented. The 3D fracture system is constructed by extruding a two-dimensional (2D) outcrop pattern of a limestone bed that exhibits a ladder structure consisting of a Bthrough-going^joint set abutted by later-stage short fractures. Geomechanical behaviour of the 3D fractured rock in response to in-situ stresses is modelled by the finite-discrete element method, which can capture the deformation of matrix blocks, variation of stress fields, reactivation of pre-existing rough fractures and propagation of new cracks. A series of numerical simulations is designed to load the fractured rock using various polyaxial in-situ stresses and the stress-dependent flow properties are further calculated. The fractured layer tends to exhibit stronger flow localisation and higher equivalent permeability as the far-field stress ratio is increased and the stress field is rotated such that fractures are preferentially oriented for shearing. The shear dilation of pre-existing fractures has dominant effects on flow localisation in the system, while the propagation of new fractures has minor impacts. The role of the overburden stress suggests that the conventional 2D analysis that neglects the effect of the out-of-plane stress (perpendicular to the bedding interface) may provide indicative approximations but not fully capture the polyaxial stress-dependent fracture network behaviour. The results of this study have important implications for understanding the heterogeneous flow of geological fluids (e.g. groundwater, petroleum) in subsurface and upscaling permeability for largescale assessments.

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Section: Finite-discrete Element Methods (Femdem)mentioning

confidence: 99%

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

et al. 2017

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“…Vyazmensky et al, 2010), rock mass strength characteri-302 zation problemsMahabadi et al, 2012),303 masonry wall stability(Reccia et al, 2012), Split Hopkinson 304 Pressure Bar experiment(Rougier et al, 2014) and hydrofracture 305. Key advantages of the FDEM are the use of306 improved finite displacements, finite rotations, and finite 307 strain-based deformability representations combined with a vari-308 ety of constitutive material laws.…”

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confidence: 99%

Fracture-permeability behavior of shale

Carey

Lei

Rougier

et al. 2015

Journal of Unconventional Oil and Gas Resources

124

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Geomechanics 23 CO 2 sequestration 24 2 5 a b s t r a c t 26The fracture-permeability behavior of Utica shale, an important play for shale gas and oil, was investi-27 gated using a triaxial coreflood device and X-ray tomography in combination with finite-discrete element 28 modeling (FDEM). Fractures were generated in both compression and in a direct-shear configuration that 29 allowed permeability to be measured across the faces of cylindrical core. Shale with bedding planes 30 perpendicular to direct-shear loading developed complex fracture networks and peak permeability of 31 30 mD that fell to 5 mD under hydrostatic conditions. Shale with bedding planes parallel to shear loading 32 developed simple fractures with peak permeability as high as 900 mD. In addition to the large anisotropy 33 in fracture permeability, the amount of deformation required to initiate fractures was greater for perpen-34 dicular layering (about 1% versus 0.4%), and in both cases activation of existing fractures are more likely 35 sources of permeability in shale gas plays or damaged caprock in CO 2 sequestration because of the 36 significant deformation required to form new fracture networks. FDEM numerical simulations were able 37 to replicate the main features of the fracturing processes while showing the importance of fluid penetra-38 tion into fractures as well as layering in determining fracture patterns. 39 Ó 2015 Published by Elsevier Ltd. 40 41 42 43 Introduction 44 Fracture permeability in shale 1 is crucial to understanding pro-45 duction of hydrocarbon during hydraulic fracturing operations and 46 the trapping of buoyant fluids in reservoirs, including CO 2 sequestra-47 tion projects. However, several studies suggest that the mechanisms 48 that generate permeability and govern fluid flow through fractured 49 shale are poorly understood (e.g., Dewhurst et al., 1999; Nygård et 50 al., 2006; Dusseault and McLennan, 2011; Vincent, 2012; Gomaa et 51 al., 2014). This has consequences including risks that 52 injection-triggered seismicity may allow stored CO 2 to escape 53 through damaged caprock (Zoback and Gorelick, 2012). There are 54 several lines of evidence that suggest that creating long-lasting per-55 meability in shale is difficult. For example, in hydraulic fracturing 56 the use of proppants is apparently required to maintain the perme-57 ability of the generated fracture system. Shale and other mudstone 58 are well known for their tendency toward plastic deformation or 59 creep while under stress that may close or seal fractures. Studies 60 by Kohli and Zoback (2013) show a clear connection between clay 61 and organic content of shale and the tendency toward creep. 62 Extensive studies of shale fracture behavior in European nuclear 63 waste storage programs have observed self-sealing of fractured shale 64 in tunnels as well as in experimental studies (e.g., Bastiaens et al., 65 2007; Davy et al., 2007; Bock et al., 2010). Finally, faults within 66 clay-rich rocks are known to act both as seals and fluid conduits in 67 pe...

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“…To simulate the transition from a continuum to a discontinuum, the combined finite‐discrete element method (FDEM) was proposed and an open source Y‐code has been developed . The method is quite suitable for the simulation of rock fractures . In recent years, FDEM has gained more and more attention.…”

Section: Introductionmentioning

confidence: 99%

A three‐dimensional heat transfer and thermal cracking model considering the effect of cracks on heat transfer

Yan

Jiao

Zheng

2019

Num Anal Meth Geomechanics

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Summary A simple three‐dimensional heat transfer model is developed to consider the hindering effect of cracks on heat transfer. The 3D heat transfer model can also be applied to numerical methods such as the combined finite‐discrete element method (FDEM), discrete element method (DEM), discontinuous deformation analysis (DDA), the numerical manifold method (NMM), and the finite element method (FEM) to construct thermo‐mechanical coupling models that allow these methods to solve thermal cracking problems and dynamically consider the hindering effect of cracks on heat transfer. In the 3D heat transfer model, the continuous‐discontinuous medium is discretized into independent tetrahedral elements, and joint elements are inserted between adjacent tetrahedral elements. Heat transfer calculations for continuous‐discontinuous media are converted to heat conduction in tetrahedral elements and the heat exchange between the adjacent tetrahedral elements through the joint element. If the joint element between adjacent tetrahedral elements breaks (ie, a crack generates), the heat exchange coefficient of the joint element is reduced to account for the hindering effect of cracks on heat conduction. Then the model and the FDEM are combined to build a thermo‐mechanical coupling model to simulate thermal cracking. The thermally induced deformation, stress, and cracking are investigated by the thermo‐mechanical coupling model, and the numerical results are compared with analytical solutions or experimental results. The 3D heat transfer model and thermo‐mechanical model can provide a powerful tool for simulating heat transfer and thermal cracking in a continuous‐discontinuous medium.

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Validation of a three-dimensional Finite-Discrete Element Method using experimental results of the Split Hopkinson Pressure Bar test

Cited by 146 publications

References 17 publications

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

Polyaxial stress-dependent permeability of a three-dimensional fractured rock layer

Fracture-permeability behavior of shale

A three‐dimensional heat transfer and thermal cracking model considering the effect of cracks on heat transfer

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