The concealment of old mine goafs,stemming from the limitations of early coal mining methods,poses significant challenges to the effective management and construction of surface structures in these areas.This study,set against the engineering backdrop of managing the old room-pillar goaf in Changsheng Coal Mine,employed theoretical analysis,drilling exploration,numerical simulation,and on-site transient electromagnetic surveys to examine the characteristics of overburden rock fractures within room-pillar goafs.It assessed the stability of the surface over the room-and-pillar goaf,with numerical simulations indicating that under new unit loads,the coal pillars left in the center of the stope became activated and destabilized.This led to a domino-like failure of all pil-lars in the mining site,resulting in the surface instability of the room-and-pillar goaf.Drawing on the identified stability characteristics of the room-and-pillar goaf and the flow properties of slurry within such goafs,the study proposed a dispersed point grouting filling strategy,detailing the slurry mixture and grouting techniques.Results from field transient electromagnetic surveys demonstrated the effectiveness of the dispersed point grouting meth-od in achieving comprehensive and uniform filling of the old mine goaf,with generally positive outcomes.This method also offers valuable insights for the surface management of similar old mine goafs,highlighting its im-portance for engineering applications and environmental safety.
国家科技期刊平台
NSTL
维普
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