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| Mechanical analysis of combined bearing action of surrounding rock and prestressed anchor support and optimization of support parameters |
| CHENG Peng1, 2, LI Zhongwei1, 3, WANG Zhenwei4, HE Yuan4, ZHENG Yun5 |
(1. CCTEG Coal Mining Research Institute, Beijing 100013, China；2. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 3. Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 100013, China; 4. Shandong Energy Group Luxi Mining Co., Ltd., Heze, Shandong 274700, China;
5. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China) |
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Abstract In China, coal mining predominantly occurs through underground methods, with over 12 000 kilometers of new tunnels constructed annually. Notably, more than 90% of these coal mine tunnels utilize bolt and anchor support systems. Enhancing the theoretical framework of tunnel bolt support has become a pressing concern in the coal mining sector. This study establishes a pre-tension reinforcement model for surrounding rock strength by introducing two key parameters: pre-tension force and pre-tension reinforcement coefficient. By integrating this model with the combined arch support theory, a coupled support theory for combined arches and surrounding rock pre-tension reinforcement is proposed. Additionally, an Excel-based design program for tunnel roof bolt support is developed. The research further analyzes the impact of support strength parameters and validates the coupled support theory through engineering case studies. The findings reveal that bolt length and spacing influence support strength by altering the thickness of the combined arch, demonstrating a positive correlation between bolt length and support strength, while a negative correlation exists between bolt spacing and support strength. Moreover, the tunnel span affects support strength by modifying the height-to-span ratio of the combined arch, which also shows a negative correlation with support strength. The pre-tension force impacts support strength by enhancing the reinforcement of surrounding rock, exhibiting a positive correlation with support strength. Finally, comparisons with actual coal mine tunnel bolt support design calculations indicate that the computed results closely align with actual values, thereby validating the proposed coupled support theory.
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2025, Vol. 44 
