Dynamic Breakage Characteristics of Shale with Different Bedding Angles under the Different Ambient Temperatures

Fan, Xiangpeng; Luo, Ning; Liang, Hanliang; Sun, Xin; Zhai, Cheng; Xie, Lixiang

doi:10.1007/s00603-021-02463-6

Cited by 33 publications

(7 citation statements)

References 42 publications

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“…It can be seen that throughout the test process, the AB section exhibits a plateau for about 100 μs of time, indicating that the material is being loaded at a consistent strain rate. Where point A represents the point at which the specimen reaches stress uniformity and point B represents the point at which the specimen begins to break down, i.e., the peak stress [ 21 , 22 ].

where, n is the total number of data points in the AB segment;

is the strain rate value corresponding to the data points.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of dynamic mechanical characteristics of inhomogeneous composite coal-sandstone combination for coalbed methane development

Suo

Luo

Chai

et al. 2022

Heliyon

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where, n is the total number of data points in the AB segment;

is the strain rate value corresponding to the data points.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of dynamic mechanical characteristics of inhomogeneous composite coal-sandstone combination for coalbed methane development

Suo

Luo

Chai

et al. 2022

Heliyon

Self Cite

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“…Ma et al (2018) classified the failure modes of anisotropic rocks into five categories including tensile failure across and along the weakness planes, shear failure across and along the weakness planes, and mixed failure. Fan et al (2021) found that the shale samples show the obvious phenomenon of post-peak strain softening. Sun et al (2019) thought that the splitting tensile failure is more likely to occur at a low bedding inclination, and shear or mixed failure is prone to occur at a medium inclination.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

Feng

Gong

Cheng

et al. 2022

Geomatics, Natural Hazards and Risk

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The dynamic anisotropy and failure mechanism of shales are greatly affected by bedding surfaces. To reveal the influence of beddings on anisotropic characteristics of shales under dynamic impact, the Brazilian splitting tests were conducted by the split Hopkinson pressure bar system. The fracturing process were monitored by the high-speed camera. Meanwhile, to understand crack initiation and propagation mechanism, the stress buildup, stress shadow and stress transfer were modelled based on the digital image processing and the rock failure process analysis method. The effect of dip angle and bedding spacing on crack initiation, propagation and coalescence was analyzed. Simultaneously, the spatial distribution and energy magnitude of crack-induced acoustic emissions were captured numerically. The results show that the shale discs continue to produce parallel cracks and cambered cracks induced by the high stresses at the tips of initial cracks; the tensile strength under dynamic splitting changes in the U-shaped trend with the bedding dip angle increasing; the cracking percentage of bedding surfaces decreases, and the cracking percentage of rock matrix increases with the bedding dip angle increasing. In addition, the acceleration of crack growth and the rapid growth of AE energy can be regarded as the effective precursors of shale failure.

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“…Due to the presence of bedding planes, the mechanical properties of TIR are quite different from those of relatively homogeneous rocks. The failure behavior of TIR is closely related to the related mechanical properties of the rock and is influenced by the bedding angle [2][3][4][5], confining pressure [6][7][8][9], water content [10][11][12], and temperature [13][14][15]. In addition, the failure mechanism of TIR was also revealed [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…With increasing water content, the mechanical properties and brittleness of the phyllite are weakened and the macroscopic failure angle increases, resulting in a decrease in tensile failure and an increase in shear failure [10]. Thermal treatment also has an important influence on the mechanical properties and failure modes of TIR [13][14][15]. For example, within the temperature range of 0 to 200 • C, the peak stress increased with the temperature when θ = 0 • , 45 • , and 90 • .…”

Section: Introductionmentioning

confidence: 99%

A Review of Mechanical Properties and Rockburst Investigation of Transversely Isotropic Rocks by Experimental Technique

Luo

2023

Materials

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Under complex geostress caused by long-term geological evolution, approximately parallel bedding structures are normally created in rocks due to sedimentation or metamorphism. This type of rock is known as transversely isotropic rock (TIR). Due to the existence of bedding planes, the mechanical properties of TIR are quite different from those of relatively homogeneous rocks. The purpose of this review is to discuss the research progress into the mechanical properties and failure characteristics of TIR and to explore the influence of the bedding structure on the rockburst characteristics of the surrounding rocks. First, the P-wave velocity characteristics of the TIR is summarized, followed by the mechanical properties (e.g., the uniaxial compressive strength, the triaxial compressive strength, and tensile strength) and the related failure characteristics of the TIR. The strength criteria of the TIR under triaxial compression are also summarized in this section. Second, the research progress of the rockburst tests on the TIR is reviewed. Finally, six prospects for the study of the transversely isotropic rock are presented: (1) measuring the Brazilian tensile strength of the TIR; (2) establishing the strength criteria for the TIR; (3) revealing the influence mechanism of the mineral particles between the bedding planes on rock failure from the microscopic point of view; (4) investigating the mechanical properties of the TIR in complex environments; (5) experimentally investigating the rockburst of the TIR under the stress path of “the three-dimensional high stress + internal unloading + dynamic disturbance”; and (6) studying the influence of the bedding angle, thickness, and number on the rockburst proneness of the TIR. Finally, some conclusions are summarized.

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Dynamic Breakage Characteristics of Shale with Different Bedding Angles under the Different Ambient Temperatures

Cited by 33 publications

References 42 publications

Experimental investigation of dynamic mechanical characteristics of inhomogeneous composite coal-sandstone combination for coalbed methane development

Experimental investigation of dynamic mechanical characteristics of inhomogeneous composite coal-sandstone combination for coalbed methane development

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

A Review of Mechanical Properties and Rockburst Investigation of Transversely Isotropic Rocks by Experimental Technique

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