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| Deformation-failure and energy release characteristics of anchored slab-fractured surrounding rock |
| LIU Jiacheng1, 2, YU Guangyuan1, 3, HAN Qiang1, 3, LIANG Peng1, 3, LAI Youbang4, ZHANG Yanbo1, 3, FU Aojun1, 3, TAO Zhigang5 |
(1. School of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, China; 2. Yisheng College/College of Iron & Steel Carbon Neutrality, North China University of Science and Technology, Tangshan, Hebei 063210, China; 3. Mine Green Intelligent Mining Technology Innovation Center of Hebei Province, Tangshan, Hebei 063210, China;
4. Sijiaying Yanshan lron Ore, HBIS Group Co., Ltd., Tangshan, Hebei 063700, China; 5. State Key Laboratory for Tunnel Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China) |
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Abstract To investigate the effects of anchoring on deformation, failure, and energy release characteristics of slab-fractured hard rock, this study prepared slab-fractured granite specimens with prefabricated fractures and fabricated ordinary anchor cables using steel wire ropes. By integrating CCD cameras, acoustic emission (AE) monitoring systems, and axial force sensors, the deformation and failure processes, AE signals, and axial forces of anchor cables were monitored during uniaxial compression experiments on both anchored and non-anchored slab-fractured granite specimens. The results demonstrated that: after anchor reinforcement, the average peak strength of the specimens increased by 8.94%, the average energy storage before rupture rose by 9.89%, and the average energy release during rupture decreased by 12.69%. During loading, the evolution of maximum principal strain in non-anchored specimens exhibited a “central→free-surface→synchronized propagation” pattern, while anchored specimens displayed a “free-surface→central→free-surface” pattern. Compared to non-anchored specimens, which experienced violent elastic ejection instability resulting in “V”-shaped fractures, anchored specimens maintained better structural integrity despite localized fractures, spalling, and minor fragment ejection. In the failure processes, AE energy release in non-anchored specimens was characterized by sporadic high-energy events dominated by tensile fractures, whereas anchored specimens exhibited frequent low-energy events associated with shear-tensile composite fractures. Finally, based on these findings, the anchoring mechanism was systematically discussed and summarized from two key aspects: the deformation suppression effect and the energy release buffering effect. The research results not only enhance the understanding of deformation and failure characteristics in slab-fractured rock under anchorage conditions but also provide both an experimental foundation and a theoretical basis for controlling slab-related geological hazards.
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2025, Vol. 44 
