Surface filling in steeply inclined thick coal seams can reduce mining disasters by stabilizing overburden rocks. By analyzing rock movement after filling, researchers found that the strength of filling material depends on surrounding rock features and burial depth. The peak stress increases linearly after filling, leading to stable rock pillars and fewer ground fissures. Radar detection confirmed proper filling alignment with caving roofs, preventing dynamic disasters in large mining sections. This method ensures safety and promotes environmentally friendly mining practices.