Abstract:
This paper addresses the issues of the 3
-2 coal seam east auxiliary transportation roadway in Qinglongsi Coal Mine, where it is menaced by overlying water accumulation pits and exhibits poor roof stability.A comprehensive study on the design of the roof grouting reinforcement scheme is carried out.Through analysis of the engineering geological conditions, the shallow-hole grouting reinforcement approach is determined.The drilling parameters are elaborately designed.Specifically, the number of borehole rows, row spacing, hole mouth spacing, and hole depth in diverse areas are precisely defined.The grouting pressure is set within the range of 10~15 MPa.Meanwhile, key parameters like the slurry diffusion radius and the single-hole injection volume are rationally determined.A high-performance mine organic reinforcement material is selected.An elaborate grouting reinforcement process is established, encompassing a series of procedures from hole marking to final acceptance.Once implemented, this scheme can significantly enhance the stability of the roadway roof, effectively prevent the infiltration of accumulated water, and guarantee the safety of roadway excavation and subsequent operation.