Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads
A comprehensive understanding of the failure behavior and mechanism of coal is a prerequisite for dealing with dynamic problems in mining space. In this study, the failure behavior and mechanism of coal under uniaxial dynamic compressive loads were experimentally and numerically investigated. The ex...
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doaj-e16b6343e28941caa119a8d0e81dfc5e2020-11-25T03:58:14ZengElsevierInternational Journal of Mining Science and Technology2095-26862020-09-01305613621Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loadsJunjun Feng0Enyuan Wang1Qisong Huang2Houcheng Ding3Xiangyang Zhang4Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China; State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, Henan 454003, ChinaKey Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaCivil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, ChinaCivil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, ChinaKey Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China; Corresponding author.A comprehensive understanding of the failure behavior and mechanism of coal is a prerequisite for dealing with dynamic problems in mining space. In this study, the failure behavior and mechanism of coal under uniaxial dynamic compressive loads were experimentally and numerically investigated. The experiments were conducted using a split Hopkinson pressure bar (SHPB) system. The results indicated that the typical failure of coal is lateral and axial at lower loading rates and totally smashed at higher loading rates. The further fractography analysis of lateral and axial fracture fragments indicated that the coal failure under dynamic compressive load is caused by tensile brittle fracture. In addition, the typical failure modes of coal under dynamic load were numerically reproduced. The numerical results indicated that the axial fracture is caused directly by the incident compressive stress wave and the lateral fracture is caused by the tensile stress wave reflected from the interface between coal specimen and transmitted bar. Potential application was further conducted to interpret dynamic problems in underground coal mine and it manifested that the lateral and axial fractures of coal constitute the parallel cracks in the coal mass under roof fall and blasting in mining space.http://www.sciencedirect.com/science/article/pii/S2095268619300424Split Hopkinson pressure barStress waveFailure modeFracture mechanismFractography |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Junjun Feng Enyuan Wang Qisong Huang Houcheng Ding Xiangyang Zhang |
spellingShingle |
Junjun Feng Enyuan Wang Qisong Huang Houcheng Ding Xiangyang Zhang Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads International Journal of Mining Science and Technology Split Hopkinson pressure bar Stress wave Failure mode Fracture mechanism Fractography |
author_facet |
Junjun Feng Enyuan Wang Qisong Huang Houcheng Ding Xiangyang Zhang |
author_sort |
Junjun Feng |
title |
Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads |
title_short |
Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads |
title_full |
Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads |
title_fullStr |
Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads |
title_full_unstemmed |
Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads |
title_sort |
experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads |
publisher |
Elsevier |
series |
International Journal of Mining Science and Technology |
issn |
2095-2686 |
publishDate |
2020-09-01 |
description |
A comprehensive understanding of the failure behavior and mechanism of coal is a prerequisite for dealing with dynamic problems in mining space. In this study, the failure behavior and mechanism of coal under uniaxial dynamic compressive loads were experimentally and numerically investigated. The experiments were conducted using a split Hopkinson pressure bar (SHPB) system. The results indicated that the typical failure of coal is lateral and axial at lower loading rates and totally smashed at higher loading rates. The further fractography analysis of lateral and axial fracture fragments indicated that the coal failure under dynamic compressive load is caused by tensile brittle fracture. In addition, the typical failure modes of coal under dynamic load were numerically reproduced. The numerical results indicated that the axial fracture is caused directly by the incident compressive stress wave and the lateral fracture is caused by the tensile stress wave reflected from the interface between coal specimen and transmitted bar. Potential application was further conducted to interpret dynamic problems in underground coal mine and it manifested that the lateral and axial fractures of coal constitute the parallel cracks in the coal mass under roof fall and blasting in mining space. |
topic |
Split Hopkinson pressure bar Stress wave Failure mode Fracture mechanism Fractography |
url |
http://www.sciencedirect.com/science/article/pii/S2095268619300424 |
work_keys_str_mv |
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1724458411130617856 |