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学者姓名：张婷
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Abstract ：
The failure characteristics of layered rocks are a vital issue for stability evaluations of underground engineering projects. Layered rocks in a restricted true three-dimensional (3D) stress state behave substantially differently from those under uniaxial or conventional triaxial stress. In this study, true triaxial experiments are carried out to investigate the mechanical and volumetric fracturing behaviors of layered composite sandstones (LCSs) with a change in grain size (Cgrain size) between the layers. Under true triaxial stress, the strengths of LCSs increase considerably as the Cgrain size value increases, which is first reported. The strength enhancements of LCSs with increased sigma 2 (intermediate principal stress) and Cgrain size values are related to the enhanced grain interlocking effect and the interface effect between the layers. As sigma 2 increases, the volumetric fracturing behaviors of LCSs change from 3D failure toquasi-3D failure characterized by delamination fracture. The effects of sigma 2 on fracture are revealed by quantifying the cracking morphologies on the layer interface. Aided by the nuclear magnetic resonance (NMR) technique, the correlations of rock porosity with the sigma 2 and Cgrain size values are established. This paper promotes the understanding of the failure mechanisms of LCSs with a contrast in grain size under true triaxial stress and helps interpret field observations. True triaxial compression experiments are performed to investigate the mechanical and volumetric fracturing behaviors of layered composite sandstones (LCSs).The effects of the contrast in grain size (grain size) between the layers and intermediate principal stress (2) on the rock behaviors are investigated.The correlations of rock porosity with grain size and2 are revealed with the nuclear magnetic resonance (NMR) technique.It is first reported that the strength of LCSs under true triaxial stress increases considerably as the grain size value increases.The volumetric fracturing behaviors of LCSs change from 3D failure to quasi-3D failure characterized by the delamination fracture as 2 increases.
Keyword ：
Failure characteristics Failure characteristics Grain size Grain size Intermediate principal stress Intermediate principal stress Layered rocks Layered rocks Nuclear magnetic resonance Nuclear magnetic resonance True triaxial compression True triaxial compression
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| GB/T 7714 | Zhang, Jian-Zhi , Gu, Tian-Tian , Wang, Xia et al. Mechanical and Volumetric Fracturing Behaviors of Layered Composite Sandstones with a Contrast in Grain Size Under True Triaxial Stresses [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2024 , 57 (5) : 4089-4105 . |
| MLA | Zhang, Jian-Zhi et al. "Mechanical and Volumetric Fracturing Behaviors of Layered Composite Sandstones with a Contrast in Grain Size Under True Triaxial Stresses" . | ROCK MECHANICS AND ROCK ENGINEERING 57 . 5 (2024) : 4089-4105 . |
| APA | Zhang, Jian-Zhi , Gu, Tian-Tian , Wang, Xia , Zhang, Ting , Zhang, Zhao-Peng . Mechanical and Volumetric Fracturing Behaviors of Layered Composite Sandstones with a Contrast in Grain Size Under True Triaxial Stresses . | ROCK MECHANICS AND ROCK ENGINEERING , 2024 , 57 (5) , 4089-4105 . |
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Abstract ：
Understanding the mechanical and deformation failure behaviors of heated flawed granite under true triaxial stresses is of great significance for evaluating the wellbore stability in developing hot dry rock resources. In this study, true triaxial experiments are conducted on flawed granite specimens of a varying flaw overlapping length lfo with and without high temperature (HT) treatment, with the emphases on the crack development under true triaxial stresses and its correlations with the strength, plastic anisotropy and failure forecast. Investigations demonstrate that HT, sigma 2 (intermediate principal stress) and lfo, significantly affect the mechanical properties of flawed granite. Due to strong 3D confinement, the loop crack, the secondary transverse crack and the far-field crack are frequently induced in flawed granite, unlike experiments of uniaxial, biaxial and conventional triaxial compression. When increasing lfo, the rock bridge undergoes the stress amplification which tendentiously drives the internal crack coalescence and typically causes a reduced strength. The PSIRs (Plastic Strain Increments Ratios) analysis, first extended to the true-triaxial experimental data, reveals that the 3D stress-induced extensional/shear fracturing from the flaw tips in sigma 2-direction is the mechanism of the plastic anisotropy generated. Besides, an attempt to anticipate the failure time in the framework of the time-reversed Omori's law suggests a poor predictability by using the acoustic emission but a higher-quality forecast (being more precise and less biased) by using the dissipated energy.
Keyword ：
Failure forecast Failure forecast High-temperature treatment High-temperature treatment Intermediate principal stress Intermediate principal stress Plastic anisotropy Plastic anisotropy True triaxial experiment True triaxial experiment
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| GB/T 7714 | Zhang, Jian-Zhi , Long, Yun-Ding , Zhang, Ting et al. A true triaxial experiment investigation of the mechanical and deformation failure behaviors of flawed granite after exposure to high-temperature treatment [J]. | ENGINEERING FRACTURE MECHANICS , 2024 , 306 . |
| MLA | Zhang, Jian-Zhi et al. "A true triaxial experiment investigation of the mechanical and deformation failure behaviors of flawed granite after exposure to high-temperature treatment" . | ENGINEERING FRACTURE MECHANICS 306 (2024) . |
| APA | Zhang, Jian-Zhi , Long, Yun-Ding , Zhang, Ting , Zhou, Xiao-Ping . A true triaxial experiment investigation of the mechanical and deformation failure behaviors of flawed granite after exposure to high-temperature treatment . | ENGINEERING FRACTURE MECHANICS , 2024 , 306 . |
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The slit-cut method for the rockburst prevention and control is believed effective with its easiness in operation, adjustment and compatibility. However, there is limited advance knowledge of the physics of the slit-cut method, which is vital for the engineering designs. In this study, the biaxial compression tests with a synchronous AE (acoustic emission)-DIC (digital image correlation) monitoring are creatively carried out on the slit-contained circular opening specimens with different slit configurations to demonstrate the academic thoughts and mechanisms of the slit-cut method. The experiments document the two typical failure types namely the internal crack propagation and the dynamic rockburst, which occupy different AE hit rate characteristics and different entropy properties. With the occurrence of rockburst, the AE hit rate presents a bouncing ascend-descend trend, and a higher disorder and chaos is faithfully exhibited. Depending on the slit parameters, the slit-cut method can efficiently mitigate rockburst in terms of the occurrence frequency and magnitude. The underlying mechanism lies in the enhancement of the shear mechanism and the development of the internal cracks through which the stored energy can be greatly dissipated. However, due to the unrestricted shear failure in the slit-contained opening specimens, the opening-scale inward instability can be triggered by the internal crack coalescence, thus posing a threat to the safety of the opening. Implementing the slit-cut method with a consideration of the in-situ stress conditions is evidently essential for the safe excavation. © 2024 Elsevier Ltd
Keyword ：
Acoustic emission testing Acoustic emission testing Compression testing Compression testing Crack propagation Crack propagation Image compression Image compression Rock bursts Rock bursts Rock mechanics Rock mechanics Shear flow Shear flow
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| GB/T 7714 | Zhang, Jian-Zhi , Zhou, Yi-Jie , Liu, Cheng-Yu et al. Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention [J]. | Theoretical and Applied Fracture Mechanics , 2024 , 134 . |
| MLA | Zhang, Jian-Zhi et al. "Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention" . | Theoretical and Applied Fracture Mechanics 134 (2024) . |
| APA | Zhang, Jian-Zhi , Zhou, Yi-Jie , Liu, Cheng-Yu , Yu, Jin , Li, Xing-Shang , Zhang, Ting . Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention . | Theoretical and Applied Fracture Mechanics , 2024 , 134 . |
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