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| Coal rock mechanical response and reinforcement influence mechanism under graded pressurization path |
| XU Wensong1, 2, 3, REN Yi2, ZHAO Guangming1, 2, 3*, LYU Renjie4, ZHAO Bin4 |
| (1. National Key Laboratory of Deep Coal Safety Mining and Environmental Protection, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 2. School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 3. Key Laboratory of Safe and Effective Coal Mining, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 4. Taiyuan Huarun Coal Industry Co., Ltd. Yuanxiang Coal Mine, Taiyuan, Shanxi 030209, China) |
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Abstract To investigate the influence of support paths on the stability characteristics of roadway surrounding rock reinforcement and to address the significant deformation challenges associated with traditional support methods that neglect the reinforcement path effect, we utilized our independently developed ZST–1500 microcomputer-controlled electro-hydraulic servo coal-rock dynamic-static combined adaptive coupling testing system to conduct experiments on the mechanical properties of coal under graded pressurization. We systematically analyzed the mechanical response mechanisms, failure characteristics, and energy evolution patterns of coal and rock subjected to graded pressurization paths. The research findings reveal that: (1) As the coal-rock mass transitions into the plastic zone and confining pressure increases, its load-bearing capacity significantly improves, with a lower initial confining pressure associated with a greater increase in compressive strength. (2) The implementation of stepwise pressure increments enhances the plastic deformation capacity of the coal-rock mass, with the ratio of plastic deformation initially rising before declining as the initial confining pressure increases. (3) Stepwise pressure increments lead to multi-stage damage accumulation within the coal-rock mass, evidenced by a decrease in the inclination angle of the primary crack and an increase in the number of secondary cracks. (4) Compared to conventional triaxial tests, the peak acoustic emission (AE) ringing count decreases under the stepwise pressure increment path, while the range of high ringing counts expands. (5) Increased confining pressure significantly boosts both the energy absorption and ultimate storage capacity of the rock. However, stepwise pressure increments result in a higher proportion of pre-peak dissipated energy density, thereby intensifying pre-peak strain hardening and ultimately enhancing the overall load-bearing capacity of the coal-rock mass. These findings provide a reliable theoretical foundation for the design of surrounding rock support and the optimization of reinforcement strategies in deep roadways.
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2026, Vol. 45 
