The study looked at how mining thick coal seams can cause underground pressure and fractures. They found that as the mining thickness increases, the rock pillar thickness needed to be controlled also increases. The distance between the pressure peak and the working face is proportional to the mining thickness, meaning the damage range of overlying strata increases. Different support states were identified in extrathick coal seams, and increasing support strength can balance impact loading. Lower support strength benefits top-coal caving under normal circumstances, while increasing support strength helps with roof strata support. Releasing high pressure and other measures can ensure stope support stability under higher main roof pressure.