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学者姓名：张婷
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Abstract ：
In underground engineering, faults significantly influence the excavation stability, yet the interactive effects of fault structure and stress state on rockburst and failure mechanisms remain poorly understood. This study constructs sandstone specimens with prefabricated straight, serrated, and wavy faults, aiming to clarify how these structures govern surrounding rock mechanics under biaxial and true triaxial compression. By employing synchronized acoustic emission (AE) and digital image correlation (DIC) monitoring, the study characterizes damage evolutions and energy dissipation processes. It is revealed that fault structure and stress state synergistically dictate failure behaviors; concretely, under biaxial stress, straight faults mitigate rockburst by inhibiting the coalescence of opening-orientated tensile cracks, whereas serrated/wavy faults induce complex crack networks that facilitate gradual energy dissipation, reducing abrupt strain release. In contrast, true triaxial compression enhances shear failure mechanism, intensifying rockburst severity and shifting failure from unilateral particle ejection (biaxial) to bilateral, high-frequency debris ejection associated with extensive local instability zones formed by crack coalescence. Acousto-optical data further show that biaxial compression generates tensile-dominated failure, while true triaxial compression shifts the RA-AF distribution towards higher RA values, signaling a transition to shear-enhanced mechanisms. These results highlight the critical roles of fault-stress interactions in controlling energy dissipation and crack development, providing important insights into fault-related instability mechanisms around the excavations under high in-situ stresses. © 2025
Keyword ：
Brittle fracture Brittle fracture Cracks Cracks Ductile fracture Ductile fracture Fracture mechanics Fracture mechanics Image correlation Image correlation Insertion losses Insertion losses Stress analysis Stress analysis Trenching Trenching
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| GB/T 7714 | Zhou, Yi-Jie , Chen, Jia-Yue , Zhang, Ting et al. Highly-stressed excavation instability nearby the fault: An experimental study [J]. | Engineering Fracture Mechanics , 2025 , 324 . |
| MLA | Zhou, Yi-Jie et al. "Highly-stressed excavation instability nearby the fault: An experimental study" . | Engineering Fracture Mechanics 324 (2025) . |
| APA | Zhou, Yi-Jie , Chen, Jia-Yue , Zhang, Ting , Cao, Guan-Sen , Wen, Wen-Fu , Wu, Xue-Zhen et al. Highly-stressed excavation instability nearby the fault: An experimental study . | Engineering Fracture Mechanics , 2025 , 324 . |
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Abstract ：
The strainburst observed in laboratory model test, where a cubic rock sample with an opening is compressed until a strainburst is induced, is generally triggered by the loading stress. In contrast, in real-world engineering contexts, such strainbursts are triggered by tunnel excavation, which corresponds to the effect of unloading stress. This paper aims to study the similar and different strainburst mechanisms triggered by loading and unloading effects. Firstly, the PD method incorporating the in-situ stress into the its constitutive relationship is proposed for computational efficiency. Secondly, the PD strainburst model, which can distinguish the crack propagation from strainburst, is proposed by introducing the energy-based strain strainburst criterion. Thirdly, the proposed model is verified by simulation of tunnel excavation process and mine-by experimental tunnels. Finally, the comprehensive analysis of influence of loading and unloading on the strainburst mechanisms are conducted. The results demonstrate that the variation of energy over time for loading and unloading cases are significantly different and the trend in the intensity of strainbursts around the chamber can be referenced from the results of the laboratory model test. © 2025
Keyword ：
Trenching Trenching Tunneling (excavation) Tunneling (excavation)
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| GB/T 7714 | Jian-Zhi, Zhang , Ting, Zhang , Xin-Min, Wang . A peridynamic strainburst model for evaluating the strainburst and its dependency on the loading and unloading [J]. | Engineering Fracture Mechanics , 2025 , 324 . |
| MLA | Jian-Zhi, Zhang et al. "A peridynamic strainburst model for evaluating the strainburst and its dependency on the loading and unloading" . | Engineering Fracture Mechanics 324 (2025) . |
| APA | Jian-Zhi, Zhang , Ting, Zhang , Xin-Min, Wang . A peridynamic strainburst model for evaluating the strainburst and its dependency on the loading and unloading . | Engineering Fracture Mechanics , 2025 , 324 . |
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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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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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