Research on key technology of coal roadway support in advance abutment pressure zone

In order to solve the problem of the difficult in support of coal roadway under the influence of advance abutment pressure, a special channel for the middle excavation and withdrawal of the coal pillar in the final mining line of 8712 fully mechanized working face of Meiyukou Coal Mine was used as the engineering background. Comprehensive research methods such as theoretical analysis, FLAC^3D numerical simulation, and mine pressure monitoring were used to study the support technology of coal roadways under the influence of advance abutment pressure. The results show that the influence range of the advance abutment pressure is 60 m, and the "anchor-net-spray" support achieves good surrounding rock control effect in the stress reduction zone and the original rock stress zone; the roadway instability and deformation are still serious in stress-concentrated area, according to the deformation and failure characteristics of surrounding rock of roadway in stress-concentrated area, the combined support technology of "anchor-net-spray+yield anchor cable+grouting anchor bolt+floor groove cutting" is proposed. The field application and measured data show that the roadway surface displacement is successfully controlled within a reasonable range, the research results provide reference for the safe withdrawal in the working face and the control of the surrounding rock of coal roadway under similar geological conditions.