Mechanical responses of bedding coals under uniaxial compression: Insights from deformation, energy and acoustic emission characteristics

被引:0
作者
Wang, Yinwei [1 ]
Zhao, Zhiqiang [1 ]
Hui, Zilong [1 ]
Hao, Jinwen [1 ]
Zhang, Jingui [1 ]
机构
[1] China Univ Min & Technol Beijing, Sch Energy & Min Engn, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Bedding coals; Anisotropy; Acoustic emission; Energy damage; ROCK; FAILURE; EVOLUTION;
D O I
10.1016/j.cscm.2025.e04404
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
To evaluate the mechanical anisotropy and acoustic emission characteristics of bedded coal samples under uniaxial compression, this research makes use of both an acoustic emission system and a rock mechanics system. The findings indicate that there is a large anisotropy in the mechanical characteristics of the coal. The uniaxial compressive strength of the coal samples shows a trend of first decreasing and then increasing with changes in bedding angle. The average compressive strengths of coal samples with bedding angles of 0 degrees, 30 degrees, 60 degrees, and 90 degrees are 14.5 MPa, 10.7 MPa, 3.5 MPa, and 4.6 MPa, respectively, with the lowest value occurring at 60 degrees.Data from AE have been used to develop patterns of the progression of bedded coal degradation over time. The coal sample with a bedding angle of 60 degrees fails in 105.5 s approximately 40.4 % faster than the 177 s required for the sample with a bedding angle of 0 degrees.The total energy, elastic strain energy, and dissipated energy of the coal drop, and then they grow again. The coal sample with a bedding angle of 60 degrees has the smallest dissipated energy, accounting for 18.05 %, and is the most likely to fail under energy-driven conditions. The levels of difficulty associated with deformation and failure follow a pattern that may be described as tough, easy, and challenging when energy is the driving force. Through the process of constant fracture development, samples with a bedding angle of 0 degrees fail, while those with angles of 30 degrees and 45 degrees experience a transition from gradual to unstable propagation. Bedding angles of 60 degrees and 90 degrees lead to sudden and unstable failure.
引用
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页数:20
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共 37 条
[1]   Digital Rock Physics Using CT scans to compute rock properties [J].
Al-Marzouqi, Hasan .
IEEE SIGNAL PROCESSING MAGAZINE, 2018, 35 (02) :121-131
[2]   Experimental study on acoustic emission (AE) characteristics and crack classification during rock fracture in several basic lab tests [J].
Du, Kun ;
Li, Xuefeng ;
Tao, Ming ;
Wang, Shaofeng .
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2020, 133
[3]   Experimental Study on the Damage and Cracking Characteristics of Bedded Coal Subjected to Liquid Nitrogen Cooling [J].
Du, Menglin ;
Gao, Feng ;
Cai, Chengzheng ;
Su, Shanjie ;
Wang, Zekai .
ROCK MECHANICS AND ROCK ENGINEERING, 2021, 54 (11) :5731-5744
[4]   Influence of Intermediate Principal Stress on Mechanical and Failure Properties of Anisotropic Sandstone [J].
Gao, Dang ;
Peng, Jun ;
Kwok, Fiona C. Y. ;
Wang, Hanglong ;
Wang, Linfei .
ROCK MECHANICS AND ROCK ENGINEERING, 2024, 57 (10) :7795-7812
[5]   A Novel Staged Cyclic Damage Constitutive Model for Brittle Rock Based on Linear Energy Dissipation Law: Modelling and Validation [J].
Gong, Fengqiang ;
Zhang, Peilei ;
Du, Kun .
ROCK MECHANICS AND ROCK ENGINEERING, 2022, 55 (10) :6249-6262
[6]   Cracking Behavior and Stress Field Evolution in Coal Specimens Containing Bedding under Uniaxial Compression [J].
Guo, Chang ;
Wang, Zedong ;
Liu, Ting ;
Lin, Baiquan ;
Zhu, Chuanjie ;
Huang, Zhanbo ;
Liu, Nan .
ACS OMEGA, 2023, 8 (40) :37202-37212
[7]   Research on anisotropic characteristics and energy damage evolution mechanism of bedding coal under uniaxial compression [J].
Huang, Laisheng ;
Li, Bo ;
Li, Chao ;
Wu, Bing ;
Wang, Jingxin .
ENERGY, 2024, 301
[8]   Study on mechanical properties and energy evolution of coal under liquid nitrogen freezing [J].
Huang, Laisheng ;
Li, Bo ;
Wang, Bo ;
Wu, Bing ;
Zhang, Junxiang .
ENGINEERING FRACTURE MECHANICS, 2023, 282
[9]   Effects of coal bedding dip angle on hydraulic fracturing crack propagation [J].
Huang, Laisheng ;
Li, Bo ;
Wang, Bo ;
Zhang, Junxiang .
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES, 2023, 9 (01)
[10]   Coal Pillar Stability Investigation for High-Intensity Mining in the Water-Rich Coal Seam: A Case Study [J].
Ju, Feng ;
Wang, Dong ;
Wang, Zhongwei .
MINING METALLURGY & EXPLORATION, 2024, 41 (02) :743-768