Study and application of numerical calculation of advance bearing pressure of roadway under different mining height

Abstract:
The coal-seam occurrence conditions of Yuandian No. 1 Coal Mine in Huaibei were taken as the engineering research background in the work to explore the distribution laws of abutment pressures ahead of the roadway under two mining processes. The theoretical analysis, numerical calculation, and engineering reality measurement method were used to study the peak position and suffering area of the advanced abutment pressure of the return airway under two mining processes at working face 824. The results showed the significant influence of the mining height on plastic and elastic zones. In the fully mechanized mining stage, the bearing pressure reached a peak at 2 m ahead of the coal face, and the maximum value was 20 MPa. At the stage of com-prehensive top-coal caving, the bearing pressure at 8 m ahead of coal mining reached a peak, and the maximum value was 17.38 MPa. The suffering areas were 42 and 53 m, respectively. The bolt (cable) spacing of the roadway was optimized to improve the stress environment and bearing capacity of surrounding rocks in the roadway. The research results can provide an advanced support basis for sublevel mining at working face 824.