Article
Environmental Sciences
Rongxi Shen, Taixun Li, Hongru Li, Shun He, Enlai Zhao, Zhenhai Hou, Tongqing Chen
Summary: The experimental results showed that the saturated rock sample has lower compressive strength, starts to crack earlier, and exhibits a more complicated failure mode compared to the dried rock sample. During the loading failure of rock samples, their EMR signals respond well to the fracturing and damage.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Yongxin Che, Yongjun Song, Jianxi Ren, Jiaxing Chen, Xixi Guo, Hao Tan, Mengling Hu
Summary: Through experiments on rock samples with different saturations after freeze-thaw cycles, the study investigated the creep mechanical characteristics of rocks. The findings indicate that the internal damage and creep behavior of rocks will change as saturation increases.
Article
Engineering, Civil
Yong Niu, Jinguo Wang, Yunjin Hu, Gang Wang, Bolong Liu
Summary: This study conducts uniaxial compression tests on intact and single crack-contained rocks to investigate the time-frequency domain characteristics of acoustic emission (AE) signals during deformation failure process. Short-time Fourier transform (STFT) is used to obtain the evolution characteristics of AE signals in the time-frequency domain. Different deformation stages of rocks exhibit different AE signal modes, with five modes observed during the cracking process. The evolution characteristics of AE signals processed by STFT provide a means to evaluate rock damage process and compare the time-frequency domain characteristics between intact and cracked rocks.
GEOMECHANICS AND ENGINEERING
(2023)
Article
Instruments & Instrumentation
Hai Sun, Liqiang Ma, Yu Fu, Jie Han, Songyang Liu, Mimi Chen, Zhen Li, Feng Tian
Summary: The study utilized a rock mechanics uniaxial compression testing system and a thermal imaging camera to investigate the impact of water content on sandstone damage evolution and infrared radiation characteristics. It was found that as water content increased, stress control on IRC decreased, with water having the most significant influence on sandstone damage evolution in the failure stage.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Geochemistry & Geophysics
Zesheng Zang, Zhonghui Li, Yue Niu, He Tian, Xin Zhang, Xiaoliang Li, Muhammad Ali
Summary: The crack inclination angle and impact energy have a significant impact on the energy dissipation and electromagnetic radiation response of sandstone samples, with the crack inclination causing a first increase and then decrease in damage and electromagnetic radiation as it increases.
Article
Engineering, Environmental
Xin Ju, Fujun Niu, Minghao Liu, Jing Luo
Summary: The study investigates the effect of freeze-thaw weathering on sandstone specimens and its potential impact on geological hazards in cold regions. The results show that sandstone weathering leads to the deterioration of uniaxial compressive strength and changes in pore structure. The distribution of pore-throat networks and the equivalent radius of dominant pores underwent significant changes under freeze-thaw cycles. The permeability of the specimens gradually increased with the number of freeze-thaw cycles. These findings provide valuable insights for the prevention of geological engineering disasters in cold regions.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2024)
Article
Engineering, Geological
Xin Ju, Fujun Niu, Minghao Liu, Junlin He, Jing Luo
Summary: The degree of water saturation significantly affects the rate of rock deterioration caused by freeze-thaw weathering. As the water saturation increases, the radius of the dominant pores in the rock expands, making the rock more susceptible to deformation and failure. An increase in the number of throats disrupts the cementation between rock grains, making the rock more susceptible to freeze-thaw actions.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Yanling Liang, Runke Huo, Zhanping Song, Yanhu Mu, Guoyu Li
Summary: This study investigated the effects of different pH solutions on sandstone damage from macro-meso perspectives. The results showed that acid corrosion led to the formation of more pores and microcracks in the sandstone, loose mesostructure, and a decrease in mechanical properties. The proposed damage constitutive model for acid-corroded sandstone was verified and agreed well with experimental data.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Herui Zhang, Weihong Guo
Summary: In this study, the acoustic emission (AE) characteristics of thermally damaged rock under load were investigated during deep resource exploitation. The results showed that the strength and AE energy of sandstone decreased gradually with increasing heating temperature. Frequency domain analysis revealed that the frequency and intensity of AE also exhibited a downward trend with temperature increase. Introducing multifractal theory provided new parameters for waveform analysis, which could be combined with frequency analysis to more accurately identify rock failure in engineering practice.
Article
Construction & Building Technology
Yun Cheng, Zhanping Song, Tengtian Yang, Jingjing Han, Bowen Wang, Zekun Zhang
Summary: The aging deformation and mechanical characteristics of damaged layered hard sandstone were investigated using the digital image correlation technique and acoustic emission (AE). The results showed significant heterogeneity in mechanical parameters and failure models. The AE ringing count had fractal characteristics and the associative dimension increased with the bearing strength. The displacement fields exhibited an initial disordered distribution, evolved into an ordered structure, and localized dissimilation occurred in banded dissociation zones. A segmental statistical damage model incorporating influence factors was introduced and found to be accurate, with the influence factor correlating to the structural effect.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Chao Liu, Yixin Liu, Zhicheng Xie, Beichen Yu
Summary: Investigating the dilatancy and seepage characteristics of tight sandstone gas under different confining pressures is important for efficient development. The study conducted fluid-solid coupling triaxial loading experiments with gas-bearing sandstone and found that the sandstone exhibited brittle characteristics with tensile-shear composite failure. The results also showed a negative correlation between the dilatancy capacity of the sandstone and confining pressure, as well as significant damage dilatancy during the yielding stage resulting in a significant permeability recovery.
Article
Engineering, Geological
Fandong Meng, Yue Zhai, Yubai Li, Qingyu Xie, Huan Gao, Yan Li, Qi Dong
Summary: Rock engineering in cold regions is affected by freeze-thaw cycle and complex stress, leading to significant changes in mechanical properties of rocks. A study on Tongchuan sandstone investigated the degradation characteristics of physical and mechanical properties after freeze-thaw cycles. It was found that micropores increased significantly and the damage degree sharply increased after a certain freeze-thaw cycle. Considering the unfrozen porosity and water content is crucial in evaluating the degradation ability of freeze-thaw on rocks. The coupling effect of freeze-thaw, confining pressure, and static load showed strengthened rock strength, with static load having the greatest impact on dynamic strength.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Environmental Sciences
Baoyun Zhao, Yongfei Li, Wei Huang, Jiaosheng Yang, Junchang Sun, Wangcheng Li, Liyun Zhang, Li Zhang
Summary: The study shows that an increase in the number of wetting-drying cycles leads to a decline in the mechanical characteristics of red sandstone, with the initial ten cycles having a significant impact and causing rapid deterioration in mechanical parameters.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Geological
Kui Zhao, Daoxue Yang, Peng Zeng, Zhen Huang, Wenkai Wu, Bo Li, Tianye Teng
Summary: Increasing water content in rocks results in a decrease in strength and deformation, leading to potential geological disasters. This study investigated the impact of water content on rock failure patterns and acoustic emission characteristics in red sandstone. The findings provide valuable information for future risk assessment and disaster prevention efforts.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Multidisciplinary Sciences
Yunfei Wang, Shuren Wang, Fang Cui, Wen Wang
Summary: In this study, the frequency spectrum and damage characteristics of saturated-and-dry red sandstone were revealed by analyzing the AE parameters such as cumulative energy, cumulative ring counts, and dominant and secondary frequencies. The shear damage stress of red sandstone was determined based on the cumulative energy and cumulative ring counts curves, and the relationship between damage degree and shear strain was established. The DSF of red sandstone in saturated-and-dry state decreased with increasing normal stress. The results obtained in this study are of significant theoretical importance in determining the shear damage degree of red sandstone.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Hao Wang, Enyuan Wang, Zhonghui Li
Summary: The prediction of gas emission is important for coal and gas outburst prevention. This study established a dynamic prediction model based on gas flow analysis and found that gas emission is positively correlated with gas pressure, driving speed, and permeability coefficient, while negatively correlated with coal mass compressive strength.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Xiaofei Liu, Jifa Qian, Enyuan Wang, Zhenguo Zhang
Summary: This study investigated an integrated vortex ventilation and dust removal system for addressing dust pollution in coal mining operations. Both numerical simulation and field experiments demonstrated the system's effective dust control and removal capabilities, outperforming traditional ventilation methods.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Bing Li, Enyuan Wang, Zheng Shang, Xiaofei Liu, Zhonghui Li, Baolin Li, Hao Wang, Yue Niu, Yue Song
Summary: Accurate and advanced early warning of coal and gas outburst is crucial for ensuring the safety of coal mining. The proposed new early warning model combines ARIMA and TBM to optimize warning time and improve process safety in tunneling operations.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Mechanical
Xuelong Li, Shaojie Chen, Enyuan Wang, Zhonghui Li
Summary: This paper establishes an elastic-plastic-brittle mutation rockburst model for coal rock with structural surface, and researches the energy accumulation and dissipation mechanism during dynamic deformation and rupture to obtain the rockburst energy condition. Additionally, a volume element-region-system model of rockburst is established to explain the evolution process. The analysis of microseismic and electromagnetic radiation characteristics of coal rock provides a deeper understanding of the rockburst mechanism for accurate monitoring and early warning.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Geological
Hongru Li, Yafei Qiao, Rongxi Shen, Manchao He, Tai Cheng, Yingming Xiao, Jie Tang
Summary: The study reveals that water content significantly affects the mechanical behavior and acoustic emission signals of sandstone, with increases in water content leading to decreases in compression strength and elastic modulus, and increases in peak strain and energy dissipation. Acoustic emission energy decreases with water content, and sudden changes in signal characteristics can serve as precursors to rock destabilization and failure.
ENGINEERING GEOLOGY
(2021)
Article
Environmental Sciences
Zhibo Zhang, Enyuan Wang, Xianan Liu, Majid Khan, Miao He, Yinghua Zhang
Summary: The accuracy of source location in acoustic monitoring is crucial for monitoring the stability of complex rock mass environments. Traditional methods using equivalent velocity may result in relatively large errors in complex rock mass environments. A new source location method based on Dijkstra's algorithm (SLMD) is proposed, which shows significantly higher accuracy than traditional methods, as demonstrated in laboratory experiments.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Hongru Li, Manchao He, Rongxi Shen, Yingming Xiao, Tai Cheng
Summary: The research findings suggest that increasing water content can decrease the frequency and intensity of AE signals during rock failure. Water has a greater impact on the intensity of AE signals than on the frequency. The analysis of the energy mechanism of rock failure indicates a close relationship between the frequency and intensity of AE signals with elastic energy index W-ET and burst energy index K-E, providing important insights for rockburst monitoring.
Article
Engineering, Multidisciplinary
Hongru Li, Yafei Qiao, Rongxi Shen, Manchao He
Summary: This paper investigates the changes in electromagnetic radiation (EMR) signals of sandstone samples with different water contents and finds that water content has an impact on the signals. The experimental results show that with the increase of water content, the EMR signals of sandstone weaken, and the mechanical strength decreases. Through multifractal analysis, it is discovered that an increase in water content leads to a decrease in the non-uniformity of signals and frequency diversity, which can be considered as precursors of rock failure.
Review
Engineering, Geological
Manchao He, Tai Cheng, Yafei Qiao, Hongru Li
Summary: This article provides a comprehensive review of the recent developments and state-of-the-art in experimental, theoretical, and numerical approaches for investigating rockburst behavior and mechanisms. The definition and classification of rockburst are summarized, and available laboratory experimental technologies are reviewed. Key influencing factors and rockburst theories are discussed, as well as simulation approaches. The accuracy, stability, and reliability of different approaches are compared and assessed.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Dexing Li, Enyuan Wang, Dianqi Jin, Dongming Wang, Wei Liang
Summary: In this paper, a system for measuring weak currents stimulated from coal under an impact load is established, and the response characteristics of these weak currents are investigated. Physical models are used to explain the generation mechanism of the currents, and it is found that the weak currents decay slowly to a stable value slightly higher than the background current. The distribution of carriers, mainly electrons, follows the tip effect where electrons tend to enrich towards the crack tip.
Article
Engineering, Geological
Jie Hu, Manchao He, Hongru Li, Tai Cheng, Zhigang Tao, Dongqiao Liu, Di Peng
Summary: Impact-induced rockburst hazards pose a severe threat to the construction safety of deep-buried, high-stress tunnels. This paper investigates the control effect of Negative Poisson's ratio (NPR) cable on impact-induced rockburst. Through indoor simulation experiments, it is found that the support of NPR cables enhances energy dissipation, rock fragmentation, and the strength of the rock. Importantly, NPR support significantly minimizes the rockburst intensity by slowing down the energy release rate during rock failure. The research results provide valuable guidance for the engineering practice of rockburst control.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Yingming Xiao, Manchao He, Yafei Qiao, Menglong Peng, Hongru Li, Tai Cheng
Summary: The nonlinearity of rock becomes more significant as the buried depth increases, affecting stress redistribution and deformation patterns during tunneling. A newly proposed UHS model and the finite difference method are used to obtain a semi-analytic solution that accurately calculates the plastic internal variable and stress state in the plastic zone, without stress vibration in the strain-hardening zone. The model is validated and the effects of strain-hardening, strain-softening, and prestress on ground reactions are highlighted.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Mechanics
Tai Cheng, Hongru Li, Manchao He, Yingming Xiao
Summary: In this study, a series of tests were conducted on sandstone specimens immersed in water for different durations, and the mechanical properties and acoustic emission (AE) characteristics were analyzed. The results showed that the uniaxial compressive strength and elastic modulus decreased, while Poisson's ratio increased with the passage of immersion time. The mechanical parameters exhibited exponential correlation with immersion time and linear correlation with water content. The dominant failure mode evolved from tensile failure to shear failure gradually, and the AE intensity and frequency weakened. The weakening in rock strength and AE signals were attributed to the transformation in micro-fracture form induced by the deterioration of grain cementation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Hongru Li, Manchao He, Yafei Qiao, Tai Cheng, Yingming Xiao, Zhoujie Gu
Summary: In this study, a series of mode I fracture tests were performed on NSCB sandstone specimens under coupled static-dynamic loading using SHPB. The purpose was to investigate the dynamic fracture properties and energy partitioning, which have important implications for understanding the rockburst mechanism and its kinetic energy source. The results showed that as the loading rate increases, various fracture parameters and energy dissipation increase, while the proportion of kinetic energy decreases. The effects of static pre-load on these behaviors were also analyzed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Green & Sustainable Science & Technology
Dexing Li, Enyuan Wang, Jianhua Yue, Manman Li, Li Li, Dongming Wang, Wei Liang
Summary: This study investigates the damage evolution of granite rocks through the analysis of Pressure Stimulated Current (PSC) responses. The results show a close correlation between the variation of PSC and the mechanical behaviors of the rock. It was also found that the cumulative charge quantity effectively correlates with the damage process of granite samples.
