Triaxial compression experiments on intact veined andesite

Turichshev, Alexandr; Hadjigeorgiou, John

doi:10.1016/j.ijrmms.2016.04.012

Cited by 26 publications

(8 citation statements)

References 30 publications

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“…A gradual decrease in strain at relatively constant differential stress was observed in a soft-veined model (green dotted line in Figure 6a), which was probably due to the fracturing of the inclined soft vein, leading to shear sliding. The sliding and dilation, however, was restrained when the confinement was increased (Figure 6b, blue line), which complements the experimental data reported by Turichshev and Hadjigeorgiou (2016) and Ma et al (2016).…”

Section: Comparison Of Results With Previous Findings and Implicationsupporting

confidence: 88%

“…Journal of Geophysical Research: Solid Earth SHANG Although it is acknowledged that such inelastic compaction is often absent in intact granite (with very low porosity) (Yoon et al, 2012), similar stress-dependent dilation and compaction were also observed in laboratory experiments and reported by Turichshev and Hadjigeorgiou (2016) in veined andesite and by Ma et al (2016) in porous sandstones. This is probably due to the compaction of broken veins (for soft-veined rocks) or the collapse of pores (for porous rocks).…”

Section: 1029/2019jb019052mentioning

confidence: 70%

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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: Comparison Of Results With Previous Findings and Implicationsupporting

confidence: 88%

Section: 1029/2019jb019052mentioning

confidence: 70%

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

Shang

2020

JGR Solid Earth

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“…When the stress level increases from C1 to D1, another crack develops quickly near the first crack, and obvious localization occurs, as shown in Figure 5b. Finally, the stress reaches the peak point (E1), cracks open toward the left, and flake The triaxial compression test results reveal that the crack initiation stress level (σ ci /σ c ) is 74.53% and the crack damage stress level (σ cd /σ c ) is 89.84%, which are both larger than the stress thresholds in uniaxial compression [28]. Compared with the results in uniaxial compression, the differences are that the axial deviator stress versus the axial strain curve during the initial stage have no obvious upward concave region owing to the effect of the confining pressure.…”

Section: Field Strain Patterns and Crack Propagationmentioning

confidence: 99%

Study on the Progressive Failure Characteristics of Coal in Uniaxial and Triaxial Compression Conditions Using 3D-Digital Image Correlation

Tang

Okubo

et al. 2018

Energies

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Abstract:To investigate the progressive failure process of coal, a series of uniaxial and triaxial compression tests were conducted and a novel 3D digital image correlation instrument with six cameras combined with a special transparent pressure cell was used for the strain measurement. The stress thresholds of coal were obtained in uniaxial and triaxial compression. The energy evolution during the compression was discussed, coupled with the crack volumetric strain. The field strain of the whole specimen surface and crack propagation at different stress levels were described to study the progressive failure mechanism of coal. The average stress level of crack initiation and crack damage of coal in uniaxial compression are 43.75% and 63.03%, while that in the triaxial compression are 74.53% and 89.84%, respectively. The dissipation energy evolution corresponds to the crack volumetric strain, while the elastic energy release leads to flake ejection and coal failure. The crack evolution and localization of coal indicated the progressive failure process that the coal sample undergoes in tension failure in uniaxial compression and in tension-shear failure in triaxial compression. The findings of this study can serve as a reference to understand the failure process of coal and improve the stability and safety of mining engineering.

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“…In the field of engineering monitoring, AE techniques are often used to monitor the stability of geotechnical engineering (Smith and Dixon, 2014), structural engineering (Ishibashi et al, 2016), rock engineering (Lacidogna et al, 2011; Turichshev and Hadjigeorgiou, 2016) and so on. To observe the failure characteristics in the specimen directly, the AE events are located (Zhang and Zhao, 2013).…”

Section: Failure Characteristics Of the Unconfined Ccwbm Bodymentioning

confidence: 99%

Failure analyses of unconfined CCWBM body in uniaxial compression based on central pressure variation

Feng

Yao

et al. 2018

Waste Manag Res

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Cemented coal waste backfill material (CCWBM) is made of coal gangue, fly ash and cementitious materials. It has been widely used in the field of backfill mining to control surface subsidence and protect the environment. A large number of unconfined backfill bodies without lateral support are formed in partial backfill mining. To study the failure characteristics of unconfined CCWBM body in partial backfill, the stress-strain curves of the CCWBM were obtained by uniaxial compression tests at different ages (1-28 d). The central pressure was measured by the embedded pressure sensors. The failure characteristics of the specimen were monitored by acoustic emission (AE) positioning technique. Three observations can be made. 1. The central pressure variation curves lag behind the mean stress change curves. The central pressure curve can be divided into three stages: slow increase stage, rapid growth stage and decline stage. It has two pressure manifestations: early appearance and peak appearance. They can be as the failure precursor and instability critical, respectively. 2. The specimen forms a central elastic bearing area in the process of compression. The plastic area develops to the inner side with the increase of pressure, and an upper and lower compound cone-shaped residual area is finally formed. 3. The embedded pressure sensor can be used to monitor the instability of the unconfined backfill body. The research results can provide guidance for the in-situ stability monitoring and reinforcement of unconfined CCWBM body in partial backfill.

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Triaxial compression experiments on intact veined andesite

Cited by 26 publications

References 30 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

Study on the Progressive Failure Characteristics of Coal in Uniaxial and Triaxial Compression Conditions Using 3D-Digital Image Correlation

Failure analyses of unconfined CCWBM body in uniaxial compression based on central pressure variation

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