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RESEARCH ON SIDEWALL AND CORNER STRENGTHENED SUPPORT FOR COAL ROADWAY BY MODELING EXPERIMENTS |
| SHAN Renliang，KONG Xiangsong，YAN Fayuan，MENG Chi |
| (School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract To study the coal roadway support，the coal roadway in Fenxi mining area was used as the prototype for similar model experiments. The similar materials of coal rock layer were determined by the matching experiment. The simulated structure forms of anchor bolts and anchor cables were designed and the implementation process was expounded. Three groups of models were established to simulate the coal roadway under the conventional support，the support with the sidewall strengthened and the support with both the sidewall and corner strengthened. The experimental data were analyzed，which verified the effectiveness of sidewall and corner strengthened support which was successfully applied in engineering practice. The results of the study showed that the sidewall and corner strengthened support increased the vertical stress in the roof and floor，reduced the vertical stress in the stress concentration zone in sidewall，improved the stress state of surrounding rock，thus formed the benign effect between roof，floor and sidewall. The technology reduced the absolute and relative displacements of surrounding rock. The relative displacement in the sidewall was larger than that in the roof of coal roadway，indicating that the integrity of sidewall was worse than the roof and tend to be locally unstable. The technology controlled the generation and propagation of the cracks，prevented the failure of the sidewall and roof and thus improved the safety. The engineering application and monitored results in Xinyu mine showed that the technology had good adaptability.
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2015, Vol. 34 
