DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions
Abstract Rock burst events are frequently accompanied by the formation of extensive tensile cracks, with bedding plane dip angles fundamentally determining the tensile strength characteristics, crack propagation, and failure modes of coal measures. This study investigates the influence of bedding pl...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-08-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-11287-1 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849226439743766528 |
|---|---|
| author | Herui Zhang Enyuan Wang Jianhua Yue Bin Miao Danyang Xi Xiaozhen Teng |
| author_facet | Herui Zhang Enyuan Wang Jianhua Yue Bin Miao Danyang Xi Xiaozhen Teng |
| author_sort | Herui Zhang |
| collection | DOAJ |
| description | Abstract Rock burst events are frequently accompanied by the formation of extensive tensile cracks, with bedding plane dip angles fundamentally determining the tensile strength characteristics, crack propagation, and failure modes of coal measures. This study investigates the influence of bedding plane angles on the tensile mechanical behavior of coal rocks using PFC2D numerical simulations. Models with four distinct bedding angles (0°, 30°, 60°, 90°) were developed to analyze failure mechanisms under tensile loading. The results demonstrate three key findings: (1) both tensile strength and elastic modulus exhibit positive correlations with increasing bedding angle, with tensile strength showing greater sensitivity compared to the more gradual enhancement of elastic modulus. (2) failure patterns evolve characteristically with bedding orientation: (i) 0° specimens fail through horizontal tensile-shear composite fractures, (ii) 30° models display preferential brittle shear failure along bedding planes, (iii) 60° cases show 78% shear-dominated crack propagation parallel to bedding, while (iv) 90° configurations develop multidirectional cracking networks due to constrained bedding-parallel shear. (3) micromechanical analysis reveals that stress transfer mechanisms transition from loading-axis dominance at low angles (0°-30°), through bedding-aligned force chain concentration at intermediate angles (60°), to complex three-dimensional force redistributions at 90° where matrix-bedding interactions dominate. |
| format | Article |
| id | doaj-art-9cd62e0687c84c569b78718eac9c3fcc |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-9cd62e0687c84c569b78718eac9c3fcc2025-08-24T11:19:00ZengNature PortfolioScientific Reports2045-23222025-08-0115111110.1038/s41598-025-11287-1DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditionsHerui Zhang0Enyuan Wang1Jianhua Yue2Bin Miao3Danyang Xi4Xiaozhen Teng5School of Safety Engineering, China University of Mining and TechnologySchool of Safety Engineering, China University of Mining and TechnologySchool of Resources and Geosciences, China University of Mining and TechnologyCollege of Resources, Shandong University of Science and TechnologySchool of Resources and Geosciences, China University of Mining and TechnologySchool of Resources and Geosciences, China University of Mining and TechnologyAbstract Rock burst events are frequently accompanied by the formation of extensive tensile cracks, with bedding plane dip angles fundamentally determining the tensile strength characteristics, crack propagation, and failure modes of coal measures. This study investigates the influence of bedding plane angles on the tensile mechanical behavior of coal rocks using PFC2D numerical simulations. Models with four distinct bedding angles (0°, 30°, 60°, 90°) were developed to analyze failure mechanisms under tensile loading. The results demonstrate three key findings: (1) both tensile strength and elastic modulus exhibit positive correlations with increasing bedding angle, with tensile strength showing greater sensitivity compared to the more gradual enhancement of elastic modulus. (2) failure patterns evolve characteristically with bedding orientation: (i) 0° specimens fail through horizontal tensile-shear composite fractures, (ii) 30° models display preferential brittle shear failure along bedding planes, (iii) 60° cases show 78% shear-dominated crack propagation parallel to bedding, while (iv) 90° configurations develop multidirectional cracking networks due to constrained bedding-parallel shear. (3) micromechanical analysis reveals that stress transfer mechanisms transition from loading-axis dominance at low angles (0°-30°), through bedding-aligned force chain concentration at intermediate angles (60°), to complex three-dimensional force redistributions at 90° where matrix-bedding interactions dominate.https://doi.org/10.1038/s41598-025-11287-1Coal rockBedding anglePFCTensile strengthFailure modeForce chain characteristics |
| spellingShingle | Herui Zhang Enyuan Wang Jianhua Yue Bin Miao Danyang Xi Xiaozhen Teng DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions Scientific Reports Coal rock Bedding angle PFC Tensile strength Failure mode Force chain characteristics |
| title | DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions |
| title_full | DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions |
| title_fullStr | DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions |
| title_full_unstemmed | DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions |
| title_short | DEM simulation study on the mechanical and micro-fracture characteristics of jointed coal under direct tensile conditions |
| title_sort | dem simulation study on the mechanical and micro fracture characteristics of jointed coal under direct tensile conditions |
| topic | Coal rock Bedding angle PFC Tensile strength Failure mode Force chain characteristics |
| url | https://doi.org/10.1038/s41598-025-11287-1 |
| work_keys_str_mv | AT heruizhang demsimulationstudyonthemechanicalandmicrofracturecharacteristicsofjointedcoalunderdirecttensileconditions AT enyuanwang demsimulationstudyonthemechanicalandmicrofracturecharacteristicsofjointedcoalunderdirecttensileconditions AT jianhuayue demsimulationstudyonthemechanicalandmicrofracturecharacteristicsofjointedcoalunderdirecttensileconditions AT binmiao demsimulationstudyonthemechanicalandmicrofracturecharacteristicsofjointedcoalunderdirecttensileconditions AT danyangxi demsimulationstudyonthemechanicalandmicrofracturecharacteristicsofjointedcoalunderdirecttensileconditions AT xiaozhenteng demsimulationstudyonthemechanicalandmicrofracturecharacteristicsofjointedcoalunderdirecttensileconditions |