Filters








35 Hits in 7.7 sec

An Experimental and Numerical Study on Acoustic Emission in the Process of Rock Damage at Different Stress Paths

Dongxu Liang, Nong Zhang, Haoyu Rong, Afshin Davarpanah
2021 Geofluids  
Under cyclic loading and unloading, the number of AE events increased significantly compared with the controlled displacement and controlled stress loading methods, and the radius of the AE circle became  ...  larger and the energy also increased, which indicates a greater degree of destruction of the rock under cyclic loading and unloading.  ...  Acknowledgments This paper is supported by the Fundamental Research Funds for the Central Universities (2020ZDPYZD02).  ... 
doi:10.1155/2021/8047755 fatcat:ufgfdarz7zf3xk55ht4uklo4je

Prefabricated fractured rock under stepwise loading and unloading

Wei Zhang, Tongbin Zhao, Yanchun Yin
2022 Journal of Theoretical and Applied Mechanics  
and release under different loading and unloading stress levels.  ...  A gradual loading and unloading test of fractured rock is carried out to analyze deformation characteristics of the fractured rock during the load--bearing process, and to study the law of energy dissipation  ...  ZR2019ZD13) and National Natural Science Foundation of China (No. 51974171).  ... 
doi:10.15632/jtam-pl/145582 fatcat:xh7j2wyxnjhcliahvf3i7pzfx4

Acoustic Emission Characteristics and Energy Evolution of Red Sandstone Samples under Cyclic Loading and Unloading

Tianzuo Wang, Chunli Wang, Fei Xue, Linxiang Wang, Beyene Hana Teshome, Mengya Xue, Paola Forte
2021 Shock and Vibration  
To explore the characteristics of rock deformation and failure under cyclic loading and unloading, the MTS815 rock mechanics test system and acoustic emission (AE) signal acquisition system were used to  ...  perform cyclic loading and unloading tests on red sandstone samples.  ...  Acknowledgments e authors would like to acknowledge the financial support for this study provided by the National Natural Science Foundation of China (Grant no. 41831290) and the Natural Science Foundation  ... 
doi:10.1155/2021/8849137 fatcat:4qlbzgdg65gkfdsuzrw2chruwe

Study of Acoustic Emission and Mechanical Characteristics of Coal Samples under Different Loading Rates

Huamin Li, Huigui Li, Baobin Gao, Dongjie Jiang, Junfa Feng
2015 Shock and Vibration  
To study the effect of loading rate on mechanical properties and acoustic emission characteristics of coal samples, collected from Sanjiaohe Colliery, the uniaxial compression tests are carried out under  ...  The relationship between acoustic emission and loading rate presents a positive correlation, and the negative correlation relation has been determined between acoustic emission cumulative counts and loading  ...  Conflict of Interests The authors declare that there is no conflict of interests regarding the publication of this paper. Acknowledgments  ... 
doi:10.1155/2015/458519 fatcat:lzevglwetzb5xmuqpqsvbajuja

Laboratory Investigation on the Effects of Natural Fracture on Fracture Evolution of Granite Exposed to Freeze-Thaw-Cyclic (FTC) Loads

Yu Wang, Xuefeng Yi, Shaohua Gao, Hao Liu, Zhigang Tao
2021 Geofluids  
In this work, we reported uniaxial experimental measurements of the changes in strength, deformation, acoustic emission (AE) pattern, and Felicity effect during increasing amplitude stress-cycling conditions  ...  Knowledge of how natural fracture impacts the overall fracture evolution of freeze-thawed rock is important to predict the stability of rock structure.  ...  Acknowledgments The authors would like to thank the editors and the anonymous reviewers for their helpful and constructive comments.  ... 
doi:10.1155/2021/6650616 fatcat:jpak7buvqvcfpnqbmkgrnmgfau

Dynamic Mechanical Behavior of Dry and Water Saturated Igneous Rock with Acoustic Emission Monitoring

Jun Guo, Guo-rui Feng, Ting-ye Qi, Pengfei Wang, Jian Yang, Zhen Li, Jinwen Bai, Xianjie Du, Zehua Wang
2018 Shock and Vibration  
The uniaxial cyclic loading tests have been conducted to study the mechanical behavior of dry and water saturated igneous rock with acoustic emission (AE) monitoring.  ...  The cyclic loading and unloading increase the dislocation between the mineral aggregates and the water-rock interactions further break the adhesion of the clay minerals, which jointly promote the inner  ...  Cyclic loading and unloading tests with acoustic emission monitoring are an effective approach to quantitatively measuring deformation and damage characteristics of various materials [11] [12] [13] [14  ... 
doi:10.1155/2018/2348394 fatcat:yf6huccg7jf63p5gapem4k5bhu

Mechanical Properties and Damage in Lignite under Combined Cyclic Compression and Shear Loading

Haoshuai Wu, Haibo Bai, Yanlong Chen, Hai Pu, Kai Zhang
2020 Sustainability  
The effects of inclination angle (θ) and upper limit of cyclic stress (σmax) on mechanical properties of coal samples were analyzed, and the damage variables of coal samples were studied based on energy  ...  The results show that the uniaxial compressive strength (UCS) of coal samples after uniaxial cyclic compression and shear tests decreases with the increase of the upper limit of cyclic stress and inclination  ...  [4] studied the damage evolution mechanism of red sandstone under uniaxial cyclic loads and impact loads.  ... 
doi:10.3390/su12208393 fatcat:cvnudkpdpzaezhktbe3isfo37y

Microcrack Evolution and Associated Deformation and Strength Properties of Sandstone Samples Subjected to Various Strain Rates

Chong-Feng Chen, Tao Xu, Shao-Hua Li
2018 Minerals  
There is a need to focus more attention on determining the relationship between the micro-and macro-behavior of rocks under creep loading and impact loading.  ...  Although some studies have been conducted on the fracture surface morphology under different loading rates before the rock failure [18], few studies have been performed on the characteristics of crack  ...  Finally, the UCS tests were performed on the sample that was used in the previous cyclic loading and unloading test, and the stress-strain curves were compared with those of the impact tests, in order  ... 
doi:10.3390/min8060231 fatcat:busqnqh3jvcphjnyqecpo7rw4i

A review of experimental and theoretical research on the deformation and failure behavior of rocks subjected to cyclic loading

Yi Liu, Feng Dai
2021 Journal of Rock Mechanics and Geotechnical Engineering  
For providing a global insight of typical results and main features of rocks under cyclic loading conditions, this study comprehensively reviews the state-of-the-art of deformation and failure mechanism  ...  Thirdly, the influences of cyclic loads on the mechanical characteristics of rocks are discussed, including the cyclic stress, frequency, amplitude and waveform.  ...  Acknowledgements The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant Nos. 52039007 and 52009086), and the Sichuan Province Youth Science and  ... 
doi:10.1016/j.jrmge.2021.03.012 fatcat:aawa2p65yzhkrgri3acmjpqusu

Multifield Coupling Mechanism of Unloading Deformation and Fracture of Composite Coal-Rock

Zhen Yang, Yan Li, Xin Li, Jiayu Zhuang, Hao Li, Xue Wang, Yuning Wang, Feng Du
2021 Shock and Vibration  
The multiphysics coupling model is used to study the characteristics of coal and rock unloading under complex conditions, providing a theoretical basis and new method for the prediction and forecast of  ...  The experimental results show that the internal infrared radiation temperature of the composite coal-rock decreases during the initial stage of loading and unloading due to the discharge of internal gas  ...  Acknowledgments is work was supported by the discipline innovation team of Liaoning Technical University (grant no.  ... 
doi:10.1155/2021/2450330 fatcat:iptpaxn35jheveme5yt2hcnwde

Correlational Analytical Characterization of Energy Dissipation-Liberation and Acoustic Emission during Coal and Rock Fracture Inducing by Underground Coal Excavation

Pengfei Shan, Xingping Lai, Xiaoming Liu
2019 Energies  
A testing method to analyze the stage traits and energy release mechanism from damage to fracture of the unloading coal and rock under uniaxial compressive loading is presented.  ...  This paper uses an acoustic emission (AE) test to examine the energy dissipation and liberation of coal and rock fracture due to underground coal excavation.  ...  Conflicts of Interest: The authors declare no conflict of interest. Energies 2019, 12, 2382  ... 
doi:10.3390/en12122382 fatcat:aqximxknhrd6hgrdytrawvbwwu

Quantitative Precursory Information of Weak Shocking Failures of Composite Soft Roof

Lihua Wang, Zenghui Zhao, Zhongxi Tian, Wei Sun
2019 Shock and Vibration  
consists of the stiffness of strong body and the deterioration stiffness of weak body at softening stage; (2) during the loading process of the two-body system, isochronous sudden jumps of the deformation  ...  This study provides references for prevention and control of weak shocking disasters of composite roofs in western China.  ...  ultimate failure precursor of the burst tendency of coal sample body under was approximately at 0.90σ c and 0.81σ c under uniaxial loading and cyclic loading, respectively.  ... 
doi:10.1155/2019/2631592 fatcat:rvzhcr5tdfeopfq3izfgc32hsa

Experimental Study on Seepage Characteristics of Fractured Rock Mass under Different Stress Conditions

Ma Haifeng, Yao Fanfan, Niu Xin'gang, Guo Jia, Li Yingming, Yin Zhiqiang, Li Chuanming, Zhijie Wen
2021 Geofluids  
In order to obtain the mechanical behavior and permeability characteristics of coal under the coupling action of stress and seepage, permeability tests under different confining pressures in the process  ...  The mechanical behavior and permeability coefficient evolution response characteristics of briquette coal under stress-seepage coupling are well reflected.  ...  Acknowledgments This paper was financially supported by the National Natural Science Foundation (51904010, 51874002, and 51874006) and Anhui Provincial Natural Science Foundation (1808085QE149, 2008085ME142  ... 
doi:10.1155/2021/6381549 fatcat:zehi4sysnjcrletpq6wa4axw6q

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Xinwei Li, Zhishu Yao, Xiaohu Liu, Xianwen Huang
2022 Energies  
To explore the influence of crack angle on the mechanical properties, energy evolution, and damage evolution of sandstone, uniaxial loading tests were conducted on sandstones with different crack angles  ...  The larger the crack angle, the longer the yield stage and the shorter the failure stage. (3) At the peak point, the elastic energy, dissipated energy, and input energy of fractured sandstone always decrease  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/en15041518 fatcat:5qqtd7vc7vathp3n55yiopuq6i

Preliminary Discussion on Comprehensive Research Method for Rock Burst in Coal Mine Based on Newton's Second Law

Jianping Zuo, Hongqiang Song, Yunqian Jiang, Shankun Zhao, Meilu Yu, Liyun Li, Fabio Rizzo
2020 Shock and Vibration  
inversion of in situ stress, the evolution analysis of mining-induced stress field, energy field, and fracture field, the study of multiscale failure mechanism of coal and rock mass, the establishment  ...  These three elements refer to the coal and rock mass in the mining area, concentrated static and dynamic loads, and dynamic instability of surrounding rock, respectively.  ...  , and acoustic emission characteristics.  ... 
doi:10.1155/2020/8861306 fatcat:egpa5tioajhqnpm6gsizichh7i
« Previous Showing results 1 — 15 out of 35 results