The commonly employed impact risk assessment methods in coal mining often overlook the significant influences of rock strata positioning and thickness,thereby compromising the accuracy of existing systems in evaluating the roof impact risk across varied geological structures.This study introduced a nuanced approach by constructing mechanical models for three distinct roof structures-fully suspended,semi-suspended,and complete-ly moving—based on the extent of overburden damage in goaf areas.Through an analysis of the stress transmis-sion mechanisms inherent to each roof structure type,a novel dynamic-static coupled stress calculation method was proposed.This method integrates these roof structure models with empirical seismic data from mines,offer-ing a refined impact hazard assessment framework that incorporates roof structural characteristics.The study fur-ther explored the effects of the strata strength coefficient,thickness of key layers,and the proximity of the strata's lower boundary to the working face on the impact characteristic parameter"p".Utilizing the strata structural con-ditions from the 2201 working face in a mine in Ordos City,the 63upper06 working face in Jining City,and the 3301 working face in Heze City,the research undertook calculations for dynamic-static superimposed stresses and impact hazard assessment parameters.The findings,validated through impact hazard assessment analyses based on these calculations,enhance the precision of risk evaluations,indicating that the proposed method effectively ad-dresses the limitations of current assessment practices and offers significant insights for future mining operations.
rock burstroof structuremechanical modelabutment pressurerisk assessment
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