Numerical studies on the failure process and associated microseismicity in rock under triaxial compression

Liu, Hongyuan; Kou, Shaoquan; Lindqvist, Per-Arne; Tang, Chun An

doi:10.1016/j.tecto.2004.03.012

Cited by 67 publications

(45 citation statements)

References 28 publications

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“…A hybrid FEM/DEM method consists of these essential components has been implemented by Liu et al [6] on the basis of their previous enriched finite element codes RFPA-RT2D [7] and TunGeo3D [8], and the open-source combined finite-discrete element libraries Y2D and Y3D originally developed by Munjiza [5] and Xiang et al [9], respectively, which is to be used in this study.…”

Section: Hybrid Fem/dem Methodsmentioning

confidence: 99%

Hybrid Continuum-Discontinuum Modelling of Rock Fracutre Process in Brazilian Tensile Strength Test

An¹,

Liu²,

Wang³

et al. 2017

CEJ

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A hybrid continuum-discontinuum method is introduced to model the rock failure process in Brazilian tensile strength (BTS) test. The key component of the hybrid continuum-discontinuum method, i.e. transition from continuum to discontinuum through fracture and fragmentation, is introduced in detail. A laboratory test is conducted first to capture the rock fracture pattern in the BTS test while the tensile strength is calculated according to the peak value of the loading forces. Then the proposed method is used to model the rock behaviour during BTS test. The stress propagation is modelled and compared with those modelled by finite element method in literatures. In addition, the crack initiation and propagation are captured and compared with the facture patter in laboratory test. Moreover, the force-loading displacement curve is obtained which represents a typical brittle material failure process. Furthermore, the stress distributions along the vertical direction are compared with the theoretical solution. It is concluded that the hybrid continuum-discontinuum method can model the stress propagation process and the entire rock failure process in BTS test. The proposed method is a valuable numerical tool for studying the rock behaviour involving the fracture and fragmentation processes.

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Section: Hybrid Fem/dem Methodsmentioning

confidence: 99%

Hybrid Continuum-Discontinuum Modelling of Rock Fracutre Process in Brazilian Tensile Strength Test

An¹,

Liu²,

Wang³

et al. 2017

CEJ

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“…A hybrid FEM/DEM comprising these key components has been implemented by Liu et al [12] on the basis of their previous enriched finite element codes RFPA-RT2D [13] and TunGeo3D [14], and the open-source combined finite-discrete element libraries Y2D and Y3D originally developed by Munjiza [15] and Xiang et al [16], respectively, which is to be used in this study.…”

Section: Hybrid Fem/demmentioning

confidence: 99%

“…where D is the damage variable between 0 and 1,   described in the mechanical damage model [13], and f  is the joint residual friction angle.…”

Section: Fig 1 -Relationship Between the Bonding Stress And Opening/mentioning

confidence: 99%

Hybrid Finite-Discrete Element Modelling of Blast-Induced Excavation Damaged Zone in the Top-Heading of Deep Tunnels

An¹,

Liu²,

Wang³

et al. 2017

CEJ

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A hybrid finite-discrete element method (FEM/DEM) is introduced to model the excavation damage zone induced by blast in a deep tunnel. The key components of the hybrid finite-discrete element method, i.e. transition from continuum to discontinuum through fracture and fragmentation, and detonation-induced gas expansion and flow through fracturing rock, are introduced in detail. The stress and crack initiation and propagation of an uniaxial compression test is then modelled by the proposed method and compared with those well documented in literature to calibrate the hybrid FEM/DEM. The modelled stress-loading displacement curve presents a typical failure process of brittle materials. The calibrated method is then used to model the stress and crack initiation and propagation induced by blast for the last step of excavation in a deep tunnel. A separation contour, which connects the borehole through the radial cracks from each borehole, is observed during the excavation process. The newly formed tunnel wall is produced and the main components of excavation damage zone (EDZ) are obtained. Therefore, the proposed treatment has the capabilities of modelling blast-induced EDZ and rock failure process. It is concluded that the hybrid FEM/DEM is a valuable numerical tool for studying excavation damage zone in terms of crack initiation and propagation and stress distribution.

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“…In many numerical models, the microstructures of rock materials have been simply simulated through statistical methods [7][8][9][10][11][12][13]. Although the artificial microstructure generated by these statistical models can represent many key attributes of the rock breakage, it remains unclear to what extent the artificial microstructure can be justified on rock actual microstructure and how quantitative results from microscopy observations and image analyses can be used.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of rock aggregate breakage properties using realistic texture‐based modelling

Liu

Lindqvist

Åkesson³

et al. 2011

Num Anal Meth Geomechanics

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SUMMARYRealistic texture-based modelling methods, that is microstructural modelling and micromechanical modelling, are developed to simulate the rock aggregate breakage properties on the basis of the rock actual microstructure obtained using microscopic observations and image analysis. The breakage properties of three types of rocks, that is Avja, LEP and Vandle taken from three quarries in Sweden, in single aggregate breakage tests and in inter-aggregate breakage tests are then modelled using the proposed methods. The microstructural modelling directly integrates the microscopic observation, image analysis and numerical simulation together and provides a valuable tool to investigate the mechanical properties of rock aggregates on the basis of their microstructure properties. The micromechanical modelling takes the most important microstructure properties of rock aggregates into consideration and can model the major mechanical properties. Throughout this study, it is concluded that in general, the microstructure properties of rock aggregate work together to affect their mechanical properties, and it is difficult to correlate a single microstructure property with the mechanical properties of rock aggregates. In particular, for the three types of rock Avja, LEP and Vandle in this study, crack size distribution, grain size and grain perimeter (i.e. grain shape and spatial arrangement) show good correlations with the mechanical properties. The crack length and the grain size negatively affect the mechanical properties of Avja, LEP and Vandle, but the perimeter positively influences the mechanical properties. Besides, the modelled rock aggregate breakage properties in both single aggregate and inter-aggregate tests reveal that the aggregate microstructure, aggregate shape and loading conditions influence the breakage process of rock aggregate in service. For the rock aggregate with the same microstructure, the quadratic shape and good packing dramatically improve its mechanical properties. During services, the aggregate is easiest to be fragmented under point-to-point loading condition, and then in the sequence of multiple-point, point-to-plane and plane-to-plane loading conditions. Copyright

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Numerical studies on the failure process and associated microseismicity in rock under triaxial compression

Cited by 67 publications

References 28 publications

Hybrid Continuum-Discontinuum Modelling of Rock Fracutre Process in Brazilian Tensile Strength Test

Hybrid Continuum-Discontinuum Modelling of Rock Fracutre Process in Brazilian Tensile Strength Test

Hybrid Finite-Discrete Element Modelling of Blast-Induced Excavation Damaged Zone in the Top-Heading of Deep Tunnels

Characterisation of rock aggregate breakage properties using realistic texture‐based modelling

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