Quantifying the effects of vein mineralogy, thickness, and orientation on the strength of intact veined rock

Turichshev, Alexandr; Hadjigeorgiou, John

doi:10.1016/j.enggeo.2017.06.009

Cited by 20 publications

(22 citation statements)

References 5 publications

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“…The influence of vein thickness on the mechanical behavior of both soft-and hard-veined granite was not pronounced (Figures 12b and 12c), which is in good agreement with the observation in a laboratory study (Turichshev & Hadjigeorgiou, 2017). The rupture pattern of the four soft-veined granite models shows high similarity in shape, except for the thickness of the shear bands (Figure 12b).…”

Section: 1029/2019jb019052supporting

confidence: 86%

“…This study also demonstrated that vein thickness had a negligible impact on the rupture characteristics of the veined models (Figure 12), irrespective of the vein strength. Vein orientation, on the contrary, exhibited a profound influence (Figure 13) on the rupture of the veined models, which was also observed in a laboratory test by Turichshev and Hadjigeorgiou (2017).…”

Section: Comparison Of Results With Previous Findings and Implicationsupporting

confidence: 61%

“…Although difficult, the effect of multiple veins on the mechanical behavior of rock is also explored. An attempt in the construction of discrete vein networks considering vein geometry (i.e., vein thickness and orientation) was reported by Turichshev and Hadjigeorgiou (2017), where up to thirty-three visible vein exposures were traced on sixteen 50-mm diameter cores in the laboratory. The traced veins were then implemented into a 3D representation of vein networks by assuming that the vein traces were persistent within the cores.…”

Section: Introductionmentioning

confidence: 99%

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Rupture Of Veined Granite In Polyaxial Compression: Insights From Three‐Dimensional Discrete Element Method Modeling

Shang

2020

JGR Solid Earth

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Granite formations have been frequently involved in subsurface energy‐related activities such as radioactive waste disposal, oil, and gas storage. This is principally because of their mechanical stability, low permeability, and high corrosion resistance. These favorable properties, however, can be compromised by the addition of mineral veins, which tend to occur ubiquitously in upper crustal rock formations. Evaluation of the impact of veins on the integrity and rupture characteristics of granite, especially under true triaxial stresses, is therefore important yet currently underemphasized. This study examines the rupture of veined granite in polyaxial compression via a discrete element method model. In the model with soft veins, the rupture is localized along the fabricated inclined veins (45° relative to the horizontal with strike running in the σ2 direction) under low confining stresses (σ2 < 67 MPa); in contrast, a combined rupture of veins and granite matrix is observed when σ2 is increased to 141.6 MPa. Shear sliding along the inclined veins is revealed by examining the displacement field. Shear‐induced volumetric dilation is suspected in the soft‐veined models in relatively low confining stresses (σ2 < 67 MPa) with sliding and dilation behavior apparently suppressed at σ2 = 141.6 MPa. Hard veins impede local rupture, resulting in conjugate shear bands. The well‐recognized σ2 effect is observed for the hard‐veined models, while no pronounced σ2 effect is noticed for the soft‐veined models. This study also reveals that vein thickness has a negligible impact on rupture characteristics, which is however profoundly affected by vein orientation.

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Section: 1029/2019jb019052supporting

confidence: 86%

Section: Comparison Of Results With Previous Findings and Implicationsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Rupture Of Veined Granite In Polyaxial Compression: Insights From Three‐Dimensional Discrete Element Method Modeling

Shang

2020

JGR Solid Earth

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“…However, a direct comparison between our findings and the Laubscher and Jakubec (2001) method is not possible at this stage. Turichshev and Hadjigeorgiou (2017) demonstrated in their study that the peak strength of laboratory scale defected samples is strongly influenced by the vein mineralogy and thickness. For specimens with high volumetric content of ''hard'' minerals (i.e.…”

Section: Influence Of Defect Strengthmentioning

confidence: 99%

“…On the contrary, from an extensive laboratory dataset of different types of heterogenous rock samples with vein infilling ranging in Mohs hardness scale from 2 to 4, Bewick et al (2018) found that vein hardness played relatively minor role on the resulting UCS values supporting the nomogram developed by Laubscher and Jakubec (2001). Although there is limited data available, the studies from Turichshev and Hadjigeorgiou (2017) and Bewick et al (2018) possibly support the existence of a mineral hardness threshold of 4 that has been previously suggested by Brzovic and Villaescusa (2007). Regardless of these findings, as has been highlighted by Jakubec and Esterhuizen (2007), the proposed Mohs hardness scale for estimating the defect infill strength is only an empirical approach, and an effort should be made to better understand the strength contribution of these defects by means of laboratory experiments (e.g.…”

Section: Influence Of Defect Strengthmentioning

confidence: 99%

Refined Approaches for Estimating the Strength of Rock Blocks

et al. 2019

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Micro-discrete fracture networks (lDFNs) have been integrated into grain-based models (GBMs) within the numerical software UDEC to assess rock block strength through a series of unconfined compressive strength (UCS) tests of progressively larger in size numerical specimens. GBMs were generated by utilizing a Voronoi tessellation scheme to capture the crack evolution processes within the intact rock material, and lDFNs were separately created and embedded into the GBMs to simulate the effect of preexisting defects. Various lDFNs realisations were generated stochastically within the software FracMan to assess the combined impact of defect intensity, persistence, strength and specimen size. The resulting synthetic rock block models were used to assess the ''flawed'' material strength at block scale through a rigorous sensitivity numerical analysis. The acquired results predict a progressive strength reduction with decreasing intact rock quality and certain trends are captured when rock block strength is expressed as a function of a newly proposed ''Defect Intensity9 Persistence'' factor. This allow us to standardise the data along specific strength reduction envelopes and to propose generic relationships that cover a wide range of defect geometrical combinations, defect strengths and sample sizes. Accordingly, an attempt is undertaken to refine two existing empirical approaches that consider the effect of scale and micro-defects explicitly for predicting the UCS of rock blocks. Keywords Rock block strength Á Scale effect Á Preexisting defects Á Synthetic rock block Á UDEC Á FracMan A. Stavrou (&) Á I. Vazaios

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Influence of Calcite Veins on the Failure Mode and Mechanical Behaviour of Basalt

Kumar

Murthy

2023

Lecture Notes in Civil Engineering

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Quantifying the effects of vein mineralogy, thickness, and orientation on the strength of intact veined rock

Cited by 20 publications

References 5 publications

Rupture Of Veined Granite In Polyaxial Compression: Insights From Three‐Dimensional Discrete Element Method Modeling

Rupture Of Veined Granite In Polyaxial Compression: Insights From Three‐Dimensional Discrete Element Method Modeling

Refined Approaches for Estimating the Strength of Rock Blocks

Influence of Calcite Veins on the Failure Mode and Mechanical Behaviour of Basalt

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