Evaluation method and classification standard of coal dynamic failure intensity based on damage-energy co-evolution#br#
BAI Yun1, GAO Feng1, NIU Yue1, 2, LUO Ning3, ZHANG Zhizhen3, SU Shanjie4, TENG Teng5, HOU Peng6
(1. State Key Laboratory of Intelligent Construction and Health Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 2. Yunlong Lake Laboratory of Deep Underground Science and Engineering, Xuzhou, Jiangsu 221116, China; 3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China; 4. School of Civil Engineering, Xuzhou University of Technology, Xuzhou, Jiangsu 221018, China; 5. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 6. School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China)
Abstract：The development of deep coal resources is of great strategic significance to ensure national energy security. However, the coal-rock dynamic disaster caused by intense engineering disturbance in deep environment has become a key bottleneck restricting the safe mining of coal resources. Accurate prediction and assessment of coal impact failure intensity becomes crucial for secure resource extraction. Therefore, in this paper, the dynamic impact test of coal was carried out by using the split Hopkinson pressure bar (SHPB) test system, and the damage-energy co-evolution characteristics were obtained. The generalized energy storage performance index k1 and the generalized energy dissipation performance index k2 were defined, and the response mechanism of strain rate to energy storage and dissipation performance of coal was revealed. Combined with the macro and micro failure characteristics, the coal impact failure intensity was discussed, and the dynamic failure intensity evaluation standard was established. The results show that the damage-energy co-evolution law of coal presents a significant strain rate effect. At the same time, the increase of strain rate enhances the energy storage performance and dissipation performance of coal. The coal impact failure intensity can be comprehensively characterized by the fragmentation and ejection degree of coal. Based on the variation of k1 value, the ejection degree of coal fragments can be scientifically divided into four grades: no ejection phenomenon, slight ejection, medium ejection and severe ejection. The degree of coal crushing can be scientifically divided into three grades: slight crushing, medium crushing and severe crushing according to the variation law of k2 value. These findings provide theoretical support and reference for the prediction and prevention of coal-rock dynamic disasters in the process of deep coal mining disturbance.
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2025, Vol. 44 
