FENG Y L, FANG J C, ZHAI X X,et al. Study on rational parameters of pressure relief and rock burst prevention borehole layout in the extraction roadways of Qianqiu Coal Mine[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(2):175-185.

doi:10.16186/j.cnki.1673-9787.2025080026

Received:2025/08/18

Revised:2025/11/13

Published:2026/01/28

Study on rational parameters of pressure relief and rock burst prevention borehole layout in the extraction roadways of Qianqiu Coal Mine

Feng Yongle1, Fang Jianchang1, Zhai Xinxian2,3, Zhang Zhen2, Zhang Zhiyong1

1.Henan Dayou Energy Company Limited， Sanmenxia  472300， Henan， China；2.School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo  454003， Henan， China；3.Henan International Joint Laboratory of Coalmine Ground Control， Jiaozuo  454003， Henan， China

Abstract: Objectives With the increase in coal seam mining depth and intensity， high-energy mine tremors frequently occur during the excavation of rockburst-prone coal mine roadways. Therefore， it is necessary to study the layout parameters of pressure relief boreholes on both sides of rockburst-prone roadways and their effectiveness in pressure relief and rockburst prevention.  Methods Using the excavation of a mining roadway in the pillar area of the 16082 bottom-slice fully mechanized caving face in Qianqiu Coal Mine as the engineering background， an orthogonal experimental design was employed to establish various pressure relief borehole layout schemes with different depths， diameters， and spacings. The stress fields of the surrounding rock for each pressure relief scheme were numerically calculated to quantitatively study the pressure relief and rockburst prevention effectiveness， and the results were validated through field industrial trials.  Results The results show that： （1） Using the transfer distance of the high-stress zone D as a quantitative evaluation index， when D≥1.42， the abutment pressure curve at the roadway sides transitions from a "single-peak" to a "double-peak" pattern， indicating sufficient pressure relief in the surrounding rock and a significant effect on pressure relief and rockburst prevention. （2） Range-variance analysis revealed that the influencing factors on the degree of high-stress zone transfer are， in order of significance： borehole depth， borehole diameter， and borehole spacing. Borehole depth primarily governs the transfer distance of the high-stress zone. The maximum transfer distance is positively correlated with borehole depth， while the average transfer distance is positively correlated with borehole diameter. When the borehole depth is constant， the average transfer distance shows a linear negative correlation with borehole spacing.  Conclusions Field industrial trials demonstrated that after optimizing the pressure relief borehole parameters， the energy of mining tremors during roadway excavation was predominantly at 10⟡ J， with fewer high-energy tremors of 10³ J and above. The convergence of the roof to floor and the average drilling cuttings volume from observation boreholes decreased by 43% and 30%， respectively. Therefore， a quantitative threshold for the transfer distance of the high-stress zone and an optimization system for pressure relief borehole parameters are proposed， providing theoretical guidance for efficient pressure relief in rockburst-prone roadways.

Key words: coal mine roadway; borehole pressure relief; borehole layout parameters; pressure relief and rock burst prevention; transfer distance of high-stress zone