Article
Engineering, Mechanical
Mengyang Zhai, Chao Xu, Lei Xue, Yuan Cui, Jinyu Dong
Summary: This study investigates the loading rate dependence of acoustic emission (AE) characteristics and the damage process of granite. The results show that the formation and evolution of cracks within the rock can be characterized by AE parameters and real-time spatial AE locations. The loading rate affects the cumulative AE count, the cumulative AE energy, and the distribution modes of fractures. The dominant failure mechanism also transitions from shear to tensile with increasing loading rate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Yufei Liang, Qingwen Yang, Ling Zhu, Tao Jiang, Meibeng Gao
Summary: Acoustic emission and thermal infrared signals are related to the process of rock breaking. Freeze-thaw cycle affects the acoustic emission and thermal infrared radiation characteristics of rocks. Under the same stress, samples with more freeze-thaw cycles have higher surface temperature, and tensile failure is the main failure factor.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Geological
Tian Yang Guo, Louis Ngai Yuen Wong
Summary: Research shows that under mixed-mode I-II loading conditions, the initiation angles of macrocracks in granite are less influenced compared to more homogeneous materials like PMMA. Acoustic emissions monitoring reveals that microcracks under mixed-mode I-II loading conditions do not nucleate as easily as under mode I loading. Additionally, the presence of mode II loading alters the acoustic emissions source mechanisms, affecting the unstable propagation of macrocracks.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Dongjie Xue, Lan Lu, Lie Gao, Lele Lu, Cheng Chen
Summary: This study indirectly reconstructs the spatial correlation of fracture network using acoustic emission signal cloud and establishes a cube cluster approach to describe fracture evolution, confirming the sensitivity of the method to dilatancy behavior and the potential for calculating fracture angle.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Construction & Building Technology
Tongyang Zhao, Wanpeng Huang, Fei Xue, Mingtao Gao, Huanyu Li, Shilei Liu, Le Sui
Summary: This study comprehensively investigates the effects of cyclic loads on the bolt-slurry interface in a mining project. It reveals the damage mechanism and acoustic emission characteristics of the interface, providing valuable insights for the design and monitoring of anchor bolts in different cyclic load conditions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Lei Qin, Chengchao Guo, Wei Sun, Xuanxuan Chu, Tonggeng Ji, Huan Guan
Summary: In this study, the acoustic emission (AE) technique was used to monitor the interface damage and reveal the interface failure mechanism of polymer-concrete composite specimens. Statistical damage constitutive models using AE parameters were established. The results showed that AE events existed throughout the failure testing process and were most significant in the yield stage. The interfacial damage of polymer-concrete specimens could be predicted by the accumulated AE ringing count and energy, and the overall b-value showed a rapid decrease in the yield stage. Additionally, the damage variable based on AE parameters can better characterize the interfacial cracking process. The present study demonstrates the effectiveness of the AE technique in capturing crack development characteristics of polymer-concrete composite structures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Tai Cheng, Linxiang Wang, Yingming Xiao, Manchao He, Tianzuo Wang, Menglong Peng, Hongru Li
Summary: Mineral grain size caused by geological diagenetic process plays a significant role in rock mechanical behaviors and stability of underground engineering. This study conducted uniaxial compression tests on granite samples with different grain sizes and investigated the correlation between damage evolution and acoustic emission (AE) data. The results show that as the grain size increases, the strength and elastic modulus decrease while plastic deformation characteristic is enhanced. Grain size also affects the frequency distribution and time-varying characteristics of AE signals.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Mechanical
Xiao-Ping Zhou, Si-Yuan Gu
Summary: Previous investigations have focused on intact and non-persistent fractured rocks, leaving a gap in understanding the dynamic mechanical properties and instability failure characteristics of persistent fractured rocks under impact loading. This study experimentally examines the dynamic mechanical properties, failure modes, and energy evolution characteristics of persistent fractured granite with various joint configurations, using the Split Hopkinson Pressure Bar apparatus. The study particularly investigates the effects of loading rate on dynamic failure and energy evolutions in persistent fractured granite. The findings provide insight into the dynamic failure mechanisms of persistent fracture under different loading rates.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mathematics, Interdisciplinary Applications
Yike Dang, Zheng Yang, Xiaoyu Liu, Chunting Lu
Summary: Investigating the strength characteristics and failure mechanism of thermally treated granite is crucial for geothermal energy storage and development. Acoustic emission is a widely used method to understand the process of rock crack generation and failure mechanism. However, previous studies showed limitations in directly observing the interaction between thermal cracks and thermal stress, as well as capturing a large percentage of tensile failure sources.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Engineering, Geological
Tian Yang Guo, Louis Ngai Yuen Wong, Zhijun Wu
Summary: This study investigates the effect of thermal treatment on the microcracking behavior of granite, identifying a transition phenomenon in microcracking behavior as the thermal treatment temperature increases. Through analysis of acoustic emissions and fracture process zone (FPZ) development features, it is found that the development of FPZ exhibits different characteristics as the temperature rises.
ENGINEERING GEOLOGY
(2021)
Article
Mechanics
Delei Shang, Yuedu Chen, Zhihong Zhao, Shuantong Shangguan, Xiaofei Qi
Summary: The shear behaviors of core samples from a deep geothermal exploration well were investigated using direct shear tests, and the fracturing process inside the intact rock samples during shear was monitored using acoustic emission (AE) technique. Three shear stages and three characteristic stresses were defined for the intact rock samples undergoing shear. Additionally, the different shear behaviors and AE characteristics between intact rocks and rock fractures were compared.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Hernan Xargay, Marianela Ripani, Paula Folino, Nicolas Nunez, Antonio Caggiano
Summary: This study investigates the use of acoustic emissions in reinforced concrete beams to assess structural responses and damage evolution. The addition of steel fibers enhanced shear strength in the beams by restricting the development of inclined cracks.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Geological
Matej Petruzalek, Z. Jechumtalova, T. Lokajicek, P. Kolar, J. Sileny
Summary: Laboratory loading experiments and acoustic emission (AE) monitoring were conducted on different structured granites to observe the fracturing and study the AE source mechanisms. The results showed that rock structure and grain size heterogeneity play crucial roles in controlling the mechanical properties. AE analysis effectively observed the fracturing process and indicated that microcracking was localized in the circumferential portion of the specimens, with sub-vertical cracks dominating the fracturing.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Vinoth Srinivasan, Haseeb Hasainar, T. N. Singh
Summary: This study discusses the influence of heating and cooling conditions on the mechanical behavior of Indian granite, highlighting the greater impact of rapid cooling on strength and elastic properties, as well as the drastic shift in fracturing thresholds with temperature and sudden thermal shock.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Manuel A. Gonzalez-Fernandez, Xian Estevez-Ventosa, Leandro R. Alejano, Hossein Masoumi
Summary: Understanding size effects is crucial for analyzing the behavior of rocks and rock masses in different scales and applications. This study conducted triaxial tests on granite samples with different confinements and sizes. The results showed that size effects were less dominant at high confining pressures for peak and residual strengths. The study also analyzed size-dependent rock strength theories and found good agreement between models and laboratory data.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
