Article
Mathematics
Longjun Dong, Lingyun Zhang, Huini Liu, Kun Du, Xiling Liu
Summary: The b value of acoustic emission is an important parameter for predicting rock fractures. This study analyzed the changes in b value during rock failure and investigated the characteristics of acoustic emission events. The results showed that b value calculated using the average amplitude had higher accuracy, and an interval of event counts of 200 was suggested for b value calculations. The study also found that the b value decreased before fracture and decreased with increasing confining pressure.
Article
Chemistry, Multidisciplinary
Chuanyu Hu, Fuding Mei, Wakeel Hussain
Summary: The rockburst simulation test revealed that rockburst is a process of rapidly releasing energy from a free surface. It results in a splitting-shearing composite failure mode and the formation of a V-shaped rockburst pit. By decomposing and reconstructing the acoustic emission signals, different frequency band sub-signals can be obtained. The dominant frequency band is found to be 125 to 250 kHz, while the suboptimal frequency band is 250 to 500 kHz. Predictive features for rockburst disasters include a high number of acoustic emission signals, a dominant frequency band with an energy distribution coefficient above 0.4, a continuous decrease in the proportion of the dominant frequency band below 80%, and a continuous increase in the proportion of the suboptimal frequency band above 20%.
APPLIED SCIENCES-BASEL
(2022)
Article
Geosciences, Multidisciplinary
Feiyue Sun, Jiaqi Guo, Junqi Fan, Xiliang Liu
Summary: This study conducted an indoor test using a new true-triaxial rockburst test system to study the effect of loading rate on rockburst. The results showed that the rockburst ejection failure process can be divided into four stages, and the macroscopic block characteristics of rockburst fragments reflect the fragmentation degree of rock, while the fractal dimension increases with the loading rate.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Kezhu Chen, Weijin Zhou, Yuangui Pan, Ying Zhuo, Guoqiang Zheng
Summary: This paper analyzes the rockburst effect on red sandstone with different water contents. The results show that rockburst occurs in dry red sandstone and 50% saturated red sandstone but not in saturated red sandstone. The characteristics of the stress-strain curve of the dry rock vary more significantly than those of the water-bearing rock, and the elastic strain energy inside the rock decreases gradually as the water content increases. The ejected fragments of dry red sandstone during the rockburst are abundant and large.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Geological
Jianwei Lu, Qiuming Gong, Lijun Yin, Kurosch Thuro, Guoshao Su
Summary: The brittle failure induced by high in-site stress significantly affects the TBM performance. True-triaxial rockburst tests were conducted to study the rock mass failure mechanism under the combined effect of high stress and TBM cutters. The experiments showed that as the confining stress increased, the peak strength of the rock specimen also increased, leading to a violent rupture and rockburst. The rock conditioned by the TBM cutter was more susceptible to brittle failure under high stress, influencing the rock breakage process by TBM cutters.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Mechanics
Ming Lan, Ying Tang, Ju Ma, Zhi-xiang Liu
Summary: In this study, cooperative event localization and velocity tomography were used to investigate the travel path of acoustic emission waves under anisotropic conditions and the evolution of wave velocity during triaxial loading. The results showed that the wave velocity field remained relatively stable when the maximum principal stress was below 16 MPa, but exhibited a discernible upward trend with increasing maximum principal stress, particularly after reaching the 40 MPa threshold.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Geosciences, Multidisciplinary
Sijie Liu, Haijun Zheng, Guoqing Chen, Yitao Hu, Kai Meng
Summary: Rock failure can have serious consequences, therefore obtaining precursor information using techniques like acoustic emission (AE) is important. AE detection technology can monitor changes inside rocks in real time and predict the process of failure. An experimental study on red sandstone found that AE parameters go through different stages during failure, and the occurrence moment and clarity of the frequent period determine the reliability and priority of the failure precursor information. The reliability and priority of AE precursor information increase with the rise of intermediate principal stress. Comparatively, AE precursor information occurs before thermal infrared precursor information.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Guang-liang Feng, Qi Ma, Giuseppe Lacidogna, Peng-zhi Pan, Zhao-feng Wang, Guo-shao Su
Summary: This study designed and conducted a series of tests for time-delayed rockburst of granite under true triaxial condition. The research monitored and studied the development process of time-delayed rockburst using various monitoring systems. The study identified the different stages of failure in granite time-delayed rockburst and examined their characteristics, such as debris composition and crack types. The results provide valuable references for warning and risk mitigation of time-delayed rockbursts.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Engineering, Chemical
Ziyi Wang, Hengyu Su, Chang Luo, Shu Ma, Heng Ding
Summary: This study investigated the mechanical response characteristics and fracture mechanism of fractured sandstone under true triaxial stress using matdem particle flow software. The results showed that increasing the intermediate principal stress is beneficial for enhancing the strength and fracture degree of sandstone, ultimately forming interlacing macroscopic cracks.
Article
Engineering, Geological
Yan Zhang, Guoqing Chen, Zhaofeng Wang, Ding Liu
Summary: This paper studies the mechanical behavior and acoustic emission (AE) characteristics of nonparallel joints with different rock bridge lengths (RBLs) at different intermediate principal stresses (sigma(2)). The results show that the peak strength of the rock increased with increasing sigma(2) and RBL, while the peak strain decreased with increasing sigma(2) and increased with increasing RBL. The AE energy increased with the ringing count, and the cumulative AE counts decreased with increasing sigma(2). The AE frequency was more sensitive to sigma(2) with longer RBL. The study proposes a modified Mogi-Coulomb-type criterion considering the effects of true triaxial stress and RBL. The research results can provide useful information for the identification of precursory information of joint rock mass failure and early warning of sudden instability failure.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Hu He, Siyuan Gong, Xuwei Li, Zonglong Mu
Summary: The coupling effect of static and dynamic stresses on coal damage under true triaxial combined static-dynamic loads was studied using numerical simulation. The results showed that increasing the dynamic load amplitude can lead to exponential growth of the plastic zone, shortened damage development time, and reduced residual strength of the coal sample, resulting in more violent dynamic failure.
Article
Engineering, Geological
Kai Ling, Yang Wang, Dongqiao Liu, Yunpeng Guo, Zheng Zhou, Lulu Zhang, Manchao He
Summary: This study aims to simulate the process of rockburst and spalling failure of roadway surrounding rock under three-dimensional stress in deep rock engineering. The failure process of a circular tunnel under initial in-situ stress was investigated, and the difference between rockburst and spalling failure was analyzed based on various characteristics. The results showed that the failure of surrounding rock was more likely to occur under dynamic disturbance load, resulting in particle ejection. Rockburst was found to be a more intense and complex failure mechanism compared to spalling failure.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Ran Zhang, Jie Liu, Zhanyou Sa, Zaiquan Wang, Shouqing Lu, Zhaoyang Lv
Summary: This study focuses on the deformation characteristics and precursory information of coal and rock under true triaxial loading conditions. The experiments demonstrate the impact of gas pressure and confining stress on the deformation, failure, and fractal characteristics of coal. The dynamic changes in correlation dimension accurately reflect the damage evolution process of coal samples, providing valuable insights for preventing coal and rock gas dynamic disasters and reducing casualties and property loss in coal mines.
Article
Engineering, Geological
Manchao He, Jieyu Li, Dongqiao Liu, Kai Ling, Fuqiang Ren
Summary: This paper introduces a new high-pressure servo true triaxial rockburst experimental apparatus designed to simulate various types of strain burst phenomena in deep underground engineering. The apparatus overcomes key challenges such as rapid unloading under high pressure and system stability after unloading. It can provide experimental support for strain burst mechanism research and serve as an experimental basis for different types of strain burst research.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Environmental
Guoshao Su, Guofu Zhao, Jianqing Jiang, Xiaochuan Hu
Summary: Rockburst is a common catastrophic phenomenon in deep underground excavations, and microseismic (MS) monitoring is a significant technique for its prediction. Laboratory investigations show that characteristics of MS signals are consistent with those obtained on-site, and essential differences exist in precursors between MS and AE signals during rockbursts, suggesting that integrated usage of both signals can effectively increase the accuracy of rockburst prediction.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Geological
Guoshao Su, Shaobin Zhai, Jianqing Jiang, Gangliang Zhang, Liubin Yan
ROCK MECHANICS AND ROCK ENGINEERING
(2017)
Article
Engineering, Geological
Guoshao Su, Jianqing Jiang, Shaobin Zhai, Gangliang Zhang
ROCK MECHANICS AND ROCK ENGINEERING
(2017)
Article
Engineering, Geological
Shaobin Zhai, Guoshao Su, Shunde Yin, Bin Zhao, Liubin Yan
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2020)
