Optimization and application of bolting and grouting support parameters in roadway with fractured surrounding rock

• Published in: Mei kuang an quan Vol. 55; no. 3; pp. 181 - 189
• Main Authors: Senhu LIU, Jianguo NING, Xinshuai SHI, Wen ZHANG, Shangming LIU, Xiaoguang XIE
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Safety in Coal Mines 01-03-2024
• Subjects: anchor grouting support; broken surrounding rock; grouting anchor cable; grouting reinforcement; numerical simulation; slurry diffusion; surrounding rock control
• ISSN: 1003-496X
• DOI: 10.13347/j.cnki.mkaq.20230468

In view of the loose, broken and serious deformation of the surrounding rock of the connection roadway in the south of 730 mining area of Xinhe Mining Company, the influence of different grouting parameters on the slurry diffusion was discussed by using Comsol Multiphysics finite element analysis software; on this basis, the influence of different grouting anchor cable arrangement on grouting effect is studied. The results show that the slurry diffusion radius will gradually increase with the increase of grouting pressure and grouting time. The average growth rate of slurry diffusion radius is 30.95% for each increase of 1 MPa grouting pressure and 25.67% for each increase of 1 min grouting time; the layout of the grouting anchor cable determines the scope of the grouting reinforcement circle. When the “hexagon” layout is adopted, the scope of the grouting reinforcement circle is relatively large, and there will be no slurry leakage on both sides of the roof. Based on the numerical simulation results, it is d