关键词: 钻孔卸压　, 数值模拟　, 参数优化　, 应力集中

Abstract: To achieve precise roadway pressure relief and address the deterioration of surrounding rock stability caused
by blind pressure relief in high-stress and fractured zones under dynamic pressure influence,a pressure-relief method based on
borehole position optimization was proposed. Pressure-relief schemes with different borehole positions,including the roof,floor,
30° shoulder,60° shoulder,and sidewall,were designed. The reasonable advanced borehole position of the roadway under dynamic
pressure and the control effects of different schemes on surrounding rock stress and deformation after pressure relief were
investigated. The results show that:① a reasonable borehole arrangement can induce stress redistribution in the surrounding
coal and rock mass,alleviate stress concentration,reduce surrounding rock stress,and thus decrease roadway deformation;
② roof drilling and sidewall drilling can effectively control the vertical and horizontal displacements of the roadway. After sidewall
drilling,the peak stress on the coal-wall side decreases,and the peak stress position shifts deeper into the surrounding rock
at the sidewall. The 30° shoulder drilling scheme can intercept stress transmission to a certain extent,whereas the pressure-relief
effects of floor drilling and 60° shoulder drilling are not obvious. On this basis,combined with numerical analysis results,
the pressure-relief schemes were optimized,and roof drilling and sidewall drilling were identified as the two superior schemes.
Considering the production conditions of the 823 working face in Yuandian No. 1 Coal Mine,the sidewall drilling scheme was
selected for an industrial test. Field measurements showed that roadway displacement in the pressure-relief section was reduced,
anchor cable load decreased,and the growth trend of roof separation was slowed. The study results can provide a reference
for the design of pressure-relief borehole schemes in mines under similar conditions.