Experimental study of the anisotropic behaviour of the Naparima Hill argillite

Iyare, U. C.; Blake, O. O.; Ramsook, Ryan; Faulkner, Daniel R.

doi:10.1016/j.ijrmms.2022.105083

Cited by 5 publications

(4 citation statements)

References 52 publications

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Section: Results Discussionmentioning

confidence: 99%

“…Most researchers define the anisotropy ratio (AR) as the ratio between the rock properties measured vertically to the stratified structures and those measured parallel to the stratified structure. 35 For example, some researchers prefer to define the strength AR as the ratio of the obtained shale compressive strength between 90° and 0° as expressed in eq 2 . In contrast, some other researchers prefer to adopt the AR defined as the ratio of the obtained index of mechanical properties between the maximum value and the minimum value, as expressed in eq 3 : …”

Section: Results Discussionmentioning

confidence: 99%

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Comparative Study of the Mechanical and Fracturing Behaviors of Shale from Different Gas Blocks in the Longmaxi Formation

Dou,

Hou,

Wang

et al. 2023

ACS Omega

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With the development of shale gas exploration and exploitation, the mechanical and failure characteristics of shale have become one of the focuses. However, few studies have considered the differences in the mechanical properties of shales in different shale gas blocks. In this study, the effects of bedding orientation on the stress–strain curves, elastic modulus, Poisson’s ratio, and fracture morphology of shale samples from the Zhaotong block are analyzed by laboratory experiments, first. Then, a standard deviation method is used to characterize the anisotropy degree of the mechanical and fracturing characteristics of shale. The anisotropy ratio of shale samples between the Zhaotong and Chongqing areas has been comparatively studied. Comparison results show that the shale anisotropy induced by the bedding orientations demonstrates apparent regional characteristics. There are significant differences in the mechanical properties of shale obtained from different shale gas blocks. It indicates that the optimization of engineering practices such as the design of hydraulic fracturing should consider the influences of the bedding orientations and shale gas blocks on the shale anisotropy.

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Section: Results Discussionmentioning

confidence: 99%

Section: Results Discussionmentioning

confidence: 99%

Comparative Study of the Mechanical and Fracturing Behaviors of Shale from Different Gas Blocks in the Longmaxi Formation

Dou,

Hou,

Wang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…However, these theories and experiments rely on conventional triaxial stress (σ 1 > σ 2 = σ 3 ) and do not accurately represent the actual three-dimensional stress state, neglecting the significant influence of intermediate principal stress σ 2 on rock deformation and strength. Numerous in situ stress measurements demonstrate significant anisotropy in stress from shallow to middepth levels (σ 1 > σ 2 > σ 3 ) [8][9][10][11]. The confirmed influence of σ 2 on the compressive strength of jointed rock mass underscores the importance of conducting physical and mechanical property tests under true triaxial stress conditions.…”

Section: Of 18mentioning

confidence: 99%

“…= σ3) and do not accurately represent the actual three-dimensional stress state, ne the significant influence of intermediate principal stress σ2 on rock deformat strength. Numerous in situ stress measurements demonstrate significant aniso stress from shallow to mid-depth levels (σ1 > σ2 > σ3) [8][9][10][11]. The confirmed influen on the compressive strength of jointed rock mass underscores the importance of c ing physical and mechanical property tests under true triaxial stress condition Mogi developed the first genuine rock triaxial testing machine in 1980 [12], res including Zhou et al and Chen et al have extensively studied marble [13,14], lim shale, sandstone, and granite using triaxial testing equipment [15].…”

Section: Of 18mentioning

confidence: 99%

Experimental Study on Energy Release Mechanism and Crack Propagation Evolution of Sandstone under True Triaxial Loading

Zhang,

Song,

Han

2024

Applied Sciences

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The instability of hard and brittle rock often leads to disastrous consequences in underground engineering. Under various surrounding rock pressure conditions, in situ stress induces corresponding deformation and damage to the floor post-mining. Therefore, it is crucial to examine the effects of mining under different confining pressures on rock disturbance, damage characteristics, and their distribution. Consequently, triaxial loading experiments under varying intermediate principal stress conditions were conducted on red sandstone specimens, using an acoustic emission monitoring system to track energy changes during rock damage and failure. This approach aids in studying crack generation, propagation, and fracture damage evolution. The results indicate that rock deformation results in axial compression and dilatancy, aligned with the direction of minimum and intermediate principal stresses. Ductility in rock failure becomes more pronounced with increased stress, primarily manifesting as shear failure. Internal cracks in the specimen lead to stress concentration and marked plastic deformation under compression, yet do not result in macroscopic surface cracks. The fracture angle θ of specimens post-failure generally exceeds 45° and varies with stress changes; at consistent burial depths, the angle of the sandstone failure surface increases with intermediate principal stress. This paper preliminarily establishes the informational linkage between rock failure and energy release, analyzing the rock samples over time and space. This research offers insights for analyzing and mitigating sudden rock instability.

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Fracturing evolution and strain characteristics of layered rock-like materials with rough interfaces

Yin

Nie

et al. 2023

Journal of Materials Research and Technology

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Experimental study of the anisotropic behaviour of the Naparima Hill argillite

Cited by 5 publications

References 52 publications

Comparative Study of the Mechanical and Fracturing Behaviors of Shale from Different Gas Blocks in the Longmaxi Formation

Comparative Study of the Mechanical and Fracturing Behaviors of Shale from Different Gas Blocks in the Longmaxi Formation

Experimental Study on Energy Release Mechanism and Crack Propagation Evolution of Sandstone under True Triaxial Loading

Fracturing evolution and strain characteristics of layered rock-like materials with rough interfaces

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