Homogeneity-dependent fracture behavior and instability mechanism of composite coal-rock: Insights from three-point bending tests
To investigate the instability mechanisms of heterogeneous geological structures in goaf area roofs, three-point bending tests (TPBT) and numerical simulations are performed on composite coal-rock (CCR). Acoustic emission (AE) monitoring is employed to analyze key parameters, establishing a multi-pa...
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| Published in | International journal of mining science and technology Vol. 35; no. 6; pp. 913 - 932 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.06.2025
Elsevier |
| Subjects | |
| Online Access | Get full text |
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| Abstract | To investigate the instability mechanisms of heterogeneous geological structures in goaf area roofs, three-point bending tests (TPBT) and numerical simulations are performed on composite coal-rock (CCR). Acoustic emission (AE) monitoring is employed to analyze key parameters, establishing a multi-parameter quantitative system for CCR fracture processes. The impact of lithological homogeneity on fracture evolution and energy migration is examined. Results show that CCR exhibits a three-stage mechanical response: weak contact, strong contact, and post-peak stages, each with distinct crack evolution patterns. A positive correlation is found between lithological homogeneity and tensile crack proportion. No significant correlation is observed between AE average frequency (AF) and AE counts across different lithological CCR; however, peak frequency (PF) displays clear lithology-dependent characteristics. The regulatory effect of the rock homogeneity coefficient (φ) on crack derivation mechanisms is quantified, yielding mathematical relationships between fracture strength (f), crack propagation path angle (β), crack fractal dimension (D), and φ. The study highlights how different fracture modes alter energy migration pathways, confirming the coupling effect of grain distribution on mechanical response and crack propagation, and the influence of parameter φ on critical energy release zones. These findings offer new insights into CCR failure mechanisms for mining safety. |
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| AbstractList | To investigate the instability mechanisms of heterogeneous geological structures in goaf area roofs, three-point bending tests (TPBT) and numerical simulations are performed on composite coal-rock (CCR). Acoustic emission (AE) monitoring is employed to analyze key parameters, establishing a multi-parameter quantitative system for CCR fracture processes. The impact of lithological homogeneity on fracture evolution and energy migration is examined. Results show that CCR exhibits a three-stage mechanical response: weak contact, strong contact, and post-peak stages, each with distinct crack evolution patterns. A positive correlation is found between lithological homogeneity and tensile crack proportion. No significant correlation is observed between AE average frequency (AF) and AE counts across different lithological CCR; however, peak frequency (PF) displays clear lithology-dependent characteristics. The regulatory effect of the rock homogeneity coefficient (φ) on crack derivation mechanisms is quantified, yielding mathematical relationships between fracture strength (f), crack propagation path angle (β), crack fractal dimension (D), and φ. The study highlights how different fracture modes alter energy migration pathways, confirming the coupling effect of grain distribution on mechanical response and crack propagation, and the influence of parameter φ on critical energy release zones. These findings offer new insights into CCR failure mechanisms for mining safety. |
| Author | Yue, Weitao Chen, Dong Zhang, Qiming Wang, Enyuan Zhang, Li Feng, Xiaojun Tan, Tingjiang Ding, Zeng |
| Author_xml | – sequence: 1 givenname: Weitao surname: Yue fullname: Yue, Weitao organization: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 2 givenname: Enyuan surname: Wang fullname: Wang, Enyuan email: weytop@cumt.edu.cn organization: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 3 givenname: Xiaojun surname: Feng fullname: Feng, Xiaojun email: xiaojun.feng@cumt.edu.cn organization: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 4 givenname: Tingjiang surname: Tan fullname: Tan, Tingjiang organization: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 5 givenname: Li surname: Zhang fullname: Zhang, Li organization: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 6 givenname: Dong surname: Chen fullname: Chen, Dong organization: State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 7 givenname: Qiming surname: Zhang fullname: Zhang, Qiming organization: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 8 givenname: Zeng surname: Ding fullname: Ding, Zeng organization: Department of Civil Engineering, Monash University, VIC 3800, Australia |
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| Keywords | Homogeneity Fractal characteristics Composite coal-rock Instability mechanism Fracture behavior |
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