Surrounding rock control technology and its application based on synergistic roof cutting and support in advanced mining roadways of thick coal seams under three-soft conditions

Liu Shaowei; Mi Chao; He Deyin; Li Xiaopeng

doi:10.16186/j.cnki.1673-9787.2024060008

Abstract：Objectives To address the problems of severe surrounding rock stress concentration,complicated advance support procedures with poor effectiveness,and slow working-face advancement in advanced mining roadways of thick coal seams under three-soft conditions,a study on synergistic surrounding rock control technology integrating roof cutting and support was conducted.Methods Taking the belt transportation road-way of the 12203 working face in Zhaojiazhai Coal Mine as the engineering background,numerical simula-tions combined with field industrial tests were employed to analyze the factors influencing surrounding rock stress concentration in the advanced roadway section.The optimal roof-cutting scheme and advanced anchor-cable reinforcement support scheme were investigated.Results The results indicate that the superposition of the advanced and lateral abutment pressures of the working face with the lateral abutment pressure induced by roadway excavation has a significant influence on surrounding rock stress concentration in the advanced support zone.Numerical simulations demonstrate that roof cutting can effectively alleviate stress concentra-tion by transferring surrounding rock stress,modifying the load distribution of the mining area,and reliev-ing pressure.The optimal roof-cutting parameters were determined as a cutting angle of 10° and a cutting depth of 18 m,and the corresponding advanced anchor-cable reinforcement support scheme was estab-lished.Field application of the synergistic"roof cutting-support"technology in the belt transportation road-way of the 12203 working face shows that stress concentration in the shallow surrounding rock of the ad-vanced zone was effectively mitigated,advance passive support was eliminated,and safe roadway operation was ensured.Conclusions The synergistic surrounding rock control technology integrating roof cutting and support can effectively relieve stress and reinforce support,ensuring the safety and stability of advanced mining roadways while enabling safe and efficient working-face advance.This technology provides a valu-able technical reference for surrounding rock control in similar thick coal seam mining roadways under three-soft conditions.