ZHI G H, LIU J. Technology and application of coordinated deep and shallow hole blasting for roof cutting and pressure relief in gob-side entry retaining in thin coal seams[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(6):92-100.

doi:10.16186/j.cnki.1673-9787.2023110003

Received: 2023/11/01

Revised: 2024/04/25

Published: 2025/10/14

Technology and application of coordinated deep and shallow hole blasting for roof cutting and pressure relief in gob-side entry retaining in thin coal seams

Zhi Guanghui1,2, Liu Jiang1

1.School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China；2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization， Jiaozuo  454000， Henan， China

Abstract: Objectives To address the issue of surrounding rock instability in gob-side entry retaining during thin coal seam mining， a roof cutting and pressure relief technique using coordinated deep and shallow hole blasting was developed. Methods Taking the 11031 working face of Mengjin Coal Mine as the engineering background， the roof caving characteristics of gob-side entry retaining in thin coal seams were analyzed through theoretical research. A blasting technique combining deep and shallow holes was proposed. Numerical simulations were conducted to compare the stress and displacement distributions under three roof-cutting schemes： shallow-hole pre-splitting， deep-hole pre-splitting， and coordinated deep and shallow hole blasting. The effectiveness of the coordinated blasting method was validated. Meanwhile， the parameters of advanced and lagging support systems for the No.2 coal seam were optimized， and an industrial test was carried out in the belt roadway of the 11031 working face. Results The simulation results indicated that the proposed method could promote complete caving of the overlying strata in the goaf， effectively block stress transmission between strata， and improve the stress environment of the roadway roof. Field monitoring confirmed that coordinated deep and shallow hole blasting， combined with optimized support design， significantly reduced roadway deformation and ensured the stability of gob-side entry retaining. Conclusions The proposed technique effectively solves the problem of surrounding rock instability in gob-side entry retaining during thin coal seam mining.

Key words: thin coal seam; gob-side entry retaining; deep and shallow hole; coordinated blasting; roof cutting and pressure relief