On the shear failure of incipient rock discontinuities under CNL and CNS boundary conditions: Insights from DEM modelling

Shang, Junlong; Zhao, Zhiye; Ma, Shuqi

doi:10.1016/j.enggeo.2018.01.012

Cited by 50 publications

(21 citation statements)

References 38 publications

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“…Bond models have been incorporated into DEM and extensively investigated in geomechanics [30]. given by respectively, the stiffness for the softening period, the overlap corresponding to the critical bond force and the overlap corresponding to the bond breakage; and μ is the coefficient of friction.…”

Section: Discrete Element Methodsmentioning

confidence: 99%

A hybrid discrete bubble-lattice Boltzmann–discrete element model for gas-charged sediments

et al. 2019

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This paper presents a hybrid discrete bubble-lattice Boltzmann-discrete element modelling framework for simulating gas-charged sediments, especially in the seabed. A discrete bubble model proposed in chemical engineering is adapted in the coupled discrete element/lattice Boltzmann method to model the migration of gas bubbles in saturated sediments involving interactions between gas bubbles and fluid/solid phases. Surface tension is introduced into the discrete bubble model in this work, so that it can handle the complex gas-fluid-solid interface. The discrete element and lattice Boltzmann methods are, respectively, employed to simulate fluid flows and mechanical behaviours of sediments. A velocity-interpolation based immerse boundary method is utilised to resolve the coupling between the fluid flow and the solid/gas phase. The proposed technique is preliminarily validated using simulations of bubble migration in fluids, which is followed by high-resolution investigations of the transport of a gas bubble in seabed sediments. It is demonstrated that this hybrid method can reproduce, to a certain degree, the characters of bubbles moving in seabed sediment tests.

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Section: Discrete Element Methodsmentioning

confidence: 99%

A hybrid discrete bubble-lattice Boltzmann–discrete element model for gas-charged sediments

et al. 2019

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“…Rock bridges significantly increase the shear strength of individual incipient rock discontinuities (Shang and Zhao. 2017), especially under constant normal stiffness boundary conditions (Shang et al, 2018). They effectively produce a strength reserve and that is mobilised prior to failure occurring along the incipient joint plane (Jennings, 1970;Stimpson, 1978;Gehle and Kutter, 2003;Paolo et al, 2016).…”

Section: Mechanical Properties Of Individual Discontinuitiesmentioning

confidence: 99%

“…Hencher (1984) Numerical analysis has been used as an alternative to examine the shear strength of non-persistent rock joints, for example, using Itasca Particle Flow Code (e.g. Cundall, 1999;Park and Song, 2009;Ghazvinian et al, 2012;Shang et al, 2018) and Rock Failure Process Analysis code (e.g. Zhang et al, 2006).…”

Section: Mechanical Properties Of Individual Discontinuitiesmentioning

confidence: 99%

Geological discontinuity persistence: Implications and quantification

Shang

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Hencher

et al. 2018

Engineering Geology

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108

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Persistence of geological discontinuities is of great importance for many rock-related applications in earth sciences, both in terms of mechanical and hydraulic properties of individual discontinuities and fractured rock masses. Although the importance of persistence has been identified by academics and practitioners over the past decades, quantification of areal persistence remains extremely difficult; in practice, trace length from finite outcrop is still often used as an approximation for persistence. This paper reviews the mechanical behaviour of individual discontinuities that are not fully persistent, and the implications of persistence on the strength and stability of rock masses. Current techniques to quantify discontinuity persistence are then examined. This review will facilitate application of the most applicable methods to measure or predict persistence in rock engineering projects, and recommended approaches for the quantification of discontinuity persistence. Furthermore, it demonstrates that further research should focus on the development of persistence quantification standards to promote our understanding of rock mass behaviours including strength, stability and permeability.

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“…In this technique, each particle is represented numerically and is identified with its specific properties like shape, size, material, initial velocity, etc. This technique is used in many studies, especially for the investigation of the shear failure of incipient rock discontinuities to investigate the influence of the boundary conditions [5,20]. The drawback of DEM is that the technique is not well used for continuum problems.…”

Section: Introductionmentioning

confidence: 99%

Rock Mass Behavior under Tunnel Widening in Asymmetric and Symmetric Modes Considering Different Shapes and Parametric Conditions

et al. 2019

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To accommodate traffic volume on roads due to ever-increasing population growth, the widening of highways and motorways is in high demand. Nevertheless, the widening of tunnels on these road networks is quite complex due to the presence of numerous rock types, in situ stress, and different widening modes. To overcome these complexities, eight different tunnel shapes were simulated under varying support conditions for asymmetric and symmetric widening. It was found that the tunnels with a round shape, such as horseshoe and semicircular with flatbed, are more effective for asymmetric widening, whereas the provision of a rounded invert in these shapes can reverse the widening option to symmetric. Furthermore, an insignificant effect of the difference in asymmetric and symmetric widening of regular tunnel shapes, such as box, rectangular, and semi-elliptical, was found. A full factorial design statistical analysis confirmed the decrease in tunnel deformation by using various tunnel support systems and showed a significant deformation difference according to monitoring locations at the tunnel periphery. The deformation difference in the case of both tunnel widening modes was also analyzed according to different design parameters. This study provides a comprehensive understanding of rock mass behavior when the widening of any underground opening is carried out.

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On the shear failure of incipient rock discontinuities under CNL and CNS boundary conditions: Insights from DEM modelling

Abstract: The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content.

Cited by 50 publications

References 38 publications

A hybrid discrete bubble-lattice Boltzmann–discrete element model for gas-charged sediments

A hybrid discrete bubble-lattice Boltzmann–discrete element model for gas-charged sediments

Geological discontinuity persistence: Implications and quantification

Rock Mass Behavior under Tunnel Widening in Asymmetric and Symmetric Modes Considering Different Shapes and Parametric Conditions

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