LAPSE:2023.26081
Published Article
LAPSE:2023.26081
Failure Behavior and Damage Characteristics of Coal at Different Depths under Triaxial Unloading Based on Acoustic Emission
Anlin Zhang, Ru Zhang, Mingzhong Gao, Zetian Zhang, Zheqiang Jia, Zhaopeng Zhang, Ersheng Zha
March 31, 2023
The depth effect of coal mechanical behavior seriously affects the safety and efficiency of deep coal mining. To explore the differences in failure behavior and damage characteristics of coal masses at different depths during the coal mining process, based on the consideration of in situ stress environment, physical properties, and mining disturbance of coal seams, triaxial unloading experiments with acoustic emission (AE) monitoring were conducted on coal samples at four different depths taken from the Pingdingshan coal mine area. The results showed that the AE activity of deep coal was more concentrated, and the cumulative AE energy of coal increased with increasing depth. The cumulative AE energy of the 1050-m coal sample was 69 times that of the 300-m coal sample. The b value representing the microcrack scale decreased with increasing depth, and the rupture degree of deep coal increased. The cracking mode of coal was classified and the failure behavior was analyzed. The cumulative tensile crack percentage of coal increased with increasing depth, and the tensile−shear composite failure occurred in the 300-m coal sample, whereas significant tensile failure occurred in the 1050-m coal sample. In addition, the damage evolution process of coal was divided into three stages, and the characteristic stress of coal was obtained. The ratio of crack initiation stress (σci) to peak stress (σc) increased with increasing depth, and the damage evolution process of deep coal was more rapid. The research results can provide useful guidance for disaster prevention and evaluation of surrounding rock stability during deep coal resource mining in the Pingdingshan coal mine area.
Keywords
acoustic emission (AE), Coal, crack classification, damage, different depths, failure behavior, mining disturbance
Suggested Citation
Zhang A, Zhang R, Gao M, Zhang Z, Jia Z, Zhang Z, Zha E. Failure Behavior and Damage Characteristics of Coal at Different Depths under Triaxial Unloading Based on Acoustic Emission. (2023). LAPSE:2023.26081
Author Affiliations
Zhang A: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China
Zhang R: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China [ORCID]
Gao M: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China; Institute of Deep Earth Science & Green Energy, Shenzhen University, Shen
Zhang Z: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China
Jia Z: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China
Zhang Z: MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China
Zha E: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China
Journal Name
Energies
Volume
13
Issue
17
Article Number
E4451
Year
2020
Publication Date
2020-08-28
ISSN
1996-1073
Version Comments
Original Submission
Other Meta
PII: en13174451, Publication Type: Journal Article
Record Map
Published Article

LAPSE:2023.26081
This Record
External Link

https://doi.org/10.3390/en13174451
Publisher Version
Download
Files
[Download 1v1.pdf] (9.3 MB)
Mar 31, 2023
Main Article
License
CC BY 4.0
Meta
Record Statistics
Record Views
169
Version History
[v1] (Original Submission)
Mar 31, 2023
 
Verified by curator on
Mar 31, 2023
This Version Number
v1
Citations
Most Recent
This Version
URL Here
https://psecommunity.org/LAPSE:2023.26081
 
Record Owner
Auto Uploader for LAPSE
Links to Related Works
Directly Related to This Work
Publisher Version