Research and practice on prevention and control technology of rockburst during the initial mining phase in deep working faces
KONG He
WEI Quande
CHANG Yan
HAN Zhenguo
CHEN Yang
Abstract：To address the challenging issue of safe mining under rock burst prevention in working faces influ-enced by deep coal pillars,a systematic study and practice were conducted on the mechanism and preventive measures of rock burst failure.This was achieved through a combined methodology of theoretical analysis,nu-merical simulation,and engineering validation.The results indicate that:(1)Based on the "three-zone load-ing" theory,the estimated thickness of the immediate loading zone is 24 m,while that of the delayed loading zone is 51m.The maximum stress during the initial mining stage of the working face is 46.6 MPa,with a stress concentration factor of approximately 1.8.(2)Numerical simulation shows that the maximum stress in the coal pillar is about 45.4 MPa,which aligns with theoretical estimations.(3)Combining theoretical estimation and numerical simulation,it was determined that the working face is subjected to high stress during the initial min-ing period,resulting in a significant risk of rock burst.Targeted prevention measures combining drilling and blasting were proposed for rock burst control.The effectiveness was verified using micro seismic monitoring da-ta.After implementation,the frequency of micro seismic events decreased by 87.7％compared to the pre-con-struction phase,and the total energy of these events decreased by 83.4％.The energy accumulated in the 13.2 m thick siltstone roof of the coal seam was effectively released,achieving satisfactory pressure relief results and ensuring the safe mining of the working face.
Keywords：rock burstdeep miningthree-zone loadingdrilling-blasting combined method
Publication Date：2026-02-28
Online Publishing Date：2026-03-12(First online date of this platform, not the publication date of the document)
Pages：8( 197-204 )