Article
Construction & Building Technology
Jian Yang, Kang Zhao, Xiang Yu, Yajing Yan, Zhiwei He, Yun Zhou, Yanming Lai
Summary: The fracture evolution characteristics of fiber-reinforced backfill were explored through the analysis of amplitude correlation dimension, RA correlation dimension, and time of acoustic emission. The study found that the fiber-reinforced backfill exhibits good fractal characteristics, with the amplitude time series showing better fractal properties compared to the RA time series.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Materials Science, Characterization & Testing
Kang Zhao, Qizheng Huang, Yun Zhou, Yajing Yan, Jian Yang, Chao Ma, Qiang Nie, Jiale Chen, Yichen Shi
Summary: This study conducted uniaxial compression and simultaneous acoustic emission (AE) tests on cement superfine tailings backfill (CSTB) with different degrees of internal initial defects. The results showed that doping with a doping agent (DA) significantly enhanced the fluctuation and jump of the CSTB b-value, with two jumps observed in the loading process. The fractal characteristics of CSTB with DA doping were improved, and both the fractal dimension and the b-value showed a rapid decreasing trend before the overall unstable failure occurred. The admixture of DA increased the number of initial defects and non-homogeneity within the CSTB, resulting in somewhat random generation of 3D localization points of AE events. These findings can help better analyze the unstable failure process of backfill in mine hollow areas and carry out appropriate support work.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Geochemistry & Geophysics
Hongguang Ji, Dongsheng Chen, Xiaobo Su, Zhen Fu, Daolu Quan
Summary: Mining-induced earthquake is a common risk factor in mining engineering safety. This study analyzed the spatial multifractal characteristics and magnitude-frequency distribution of mine seismicity based on microseismic monitoring data from Huating Coal Mine. The results showed that mine seismicity exhibits obvious spatial multifractal characteristics and follows the Gutenberg-Richter law under high tectonic stress. The fractal dimension and b value are positively correlated, and the spatial distribution of mine seismicity is related to the magnitude-frequency distribution.
Article
Engineering, Civil
Qizheng Huang, Kang Zhao, Yajing Yan, Jun Wu, Qiang Nie, Jiale Chen, Weiling Xiao, Huiping Wang
Summary: In order to investigate the precursor characteristics of failure in weathered granite (WG), uniaxial compression tests were conducted and AE parameters were analyzed using the RMT-150C rock mechanics testing system and PCI-II acoustic emission (AE) device. The study revealed that WG mainly undergoes brittle failure, with the peak strain value being less than 1% and a rapid stress decay after the peak. The failure process of WG can be divided into four stages, with the compression stage being the longest. The ringing count rate and its cumulative amount were found to effectively indicate the failure process of WG during loading.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Lifen Zhang, Wulin Liao, Zhigao Chen, Jinggang Li, Yunsheng Yao, Guangqin Tong, Yannan Zhao, Ziyan Zhou
Summary: This study analyzed the seismic activity in the Three Gorges Reservoir area using the spatial density scanning method. The results showed a higher frequency of earthquakes during the reservoir loading and unloading processes. It was also found that certain seismic parameters exhibit a significant decrease before moderate earthquakes.
SCIENTIFIC REPORTS
(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
Mining & Mineral Processing
Zhen Huang, Qixiong Gu, Yufan Wu, Yun Wu, Shijie Li, Kui Zhao, Rui Zhang
Summary: This study investigated the failure characteristics of sandstone under different confining pressures using AE tests. The results showed that the activity of the AE signal is strongly related to the confining pressure, and the evolution of the Ib value can be divided into fluctuation, stability, and decrease stages.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Tong Chen, Kang Zhao, Yajing Yan, Yun Zhou, Zhiwei He, Lijie Guo
Summary: This study investigated the mechanical properties and acoustic emission (AE) response of cemented tailings backfill (CTB) under compression-shear action. The results show that as the shear angle increases, the peak stress and plastic yield stage decrease, damage evolution is accelerated; the AE ringing counts and energy evolution exhibit specific distribution patterns; the crack evolution mode of the specimen changes with the shear angle. This has important implications for analyzing the rupture evolution of CTB under different compression-shear angles and the stability analysis of CTB backfilled goaf.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Kang Zhao, Jian Yang, Yufeng Song, Qing Wang, Kangqi Zhao, Yongbo Ji
Summary: This study conducted uniaxial compression acoustic emission (AE) tests on low-strength molybdenum ore (LSMO) to investigate its deformation and failure laws and AE characteristics. The stress-strain curve and AE parameter data were obtained, and the relationships of stress, AE parameter, amplitude fractal dimension, and AE b value with loading time were analyzed. The study found that LSMOs mainly show brittle failure under uniaxial stress and the failure form is monoclinic shear failure. The research provides some theoretical basis for the assessment of mine surrounding rock stability and the determination of reinforcement plans.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Engineering, Geological
Yanan Gao, Donghao Lan, Shengqi Yang, Peng Hou, Yunlong Wang, Feng Ding
Summary: A series of mechanical tests and acoustic emission (AE) monitoring were conducted to investigate the effects of disturbance stress paths, disturbance modes, and initial confining pressures (ICPs) on the behavior of engineering rocks. The fractal dimensions of AE temporal distribution (Dt) and spatial distribution (Ds) were calculated and analyzed, along with the normalized AE count. The results showed that the different disturbance modes had sensitive, inferior sensitive, and delayed sensitive effects on the AE activities, depending on the ICP. The damage severity of the disturbance modes followed the order of HD, MD, and LD modes under an ICP of 12.5 MPa. The changes in Dt and Ds were consistent with the sensitive effect. Under an ICP of 25 MPa, only the HD mode caused significant damage, while the LD and MD modes showed inferior sensitive effects. Similarly, under an ICP of 37.5 MPa, the late-period Ds showed significant differences among the three disturbance modes, indicating delayed sensitive effects. Overall, the study revealed that the damage propagation and mechanical behavior of engineering rocks were influenced by both the ICP and disturbance mode.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Jingxian Xu, Xue Luo, Xin Qiu, Ganghua Hu
Summary: The objective of this study was to diagnose the damage behavior of asphalt mixtures using acoustic emission (AE) as the real-time monitoring technique. The study found that the time and frequency characteristics of AE signals can reveal the damage state of asphalt mixtures, and proposed an index RBD to evaluate the degree of damage.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Mechanical
Kui Zhao, Xing Wang, Li Wang, Peng Zeng, Daoxue Yang, Jiefang Jin
Summary: This study investigates the influence of water on the crack and acoustic emission (AE) behavior evolution of red sandstone specimens during deformation and failure. Uniaxial compression tests were conducted under different water contents. The results show that the peak strength of red sandstone decreases with increasing water content, and the dominant failure pattern changes from tension to shear. The AE events rate can be used as a precursor for the instability and failure of rock specimens with different water contents.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Zhiwei He, Kang Zhao, Yajing Yan, Fujin Ning, Yun Zhou, Yufeng Song
Summary: The study investigated the failure law of a cement paste backfill (CPB) and rock combination under pressure with different cement tailings ratios, finding significant influence of tailings content on crack evolution and acoustic emission characteristics at different stages of the CPB.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mathematics, Interdisciplinary Applications
Zilong Zhou, Congcong Zhao, Xin Cai, Yinghua Huang
Summary: This study focuses on deep mining exploration and the sustainable use of enormous data through the acoustic emission (AE) system. It applies fractal theory to analyze the non-linear and disordered information in the AE system, and constructs a three-dimensional analysis model. The experimental data and numerical simulation verify the effectiveness of the model, providing theoretical support and technical conditions for judgment and analysis of rock mass failure in mines.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Materials Science, Characterization & Testing
Qizheng Huang, Kang Zhao, Weiling Xiao, Qiang Nie, Jiale Chen, Yang Liu, Juncheng Zhong
Summary: Triaxial compression simultaneous acoustic emission (AE) tests were conducted to study the mechanical and acoustic emission characteristics of weathered granite (WG) under different confining pressures. The results showed that the strength and modulus of elasticity of WG increased with increasing confining pressure, and the failure pattern evolved from splitting failure to shear failure. The analysis of AE peak frequency and energy revealed that confining pressure limited crack evolution. The study also found that the fractal characteristics of AE ringing counts at each confining pressure were good, and the damage variables showed an increasing growth rate before failure occurred.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)