Mechanical response and damage constitutive model of layered-grouting-reinforced fractured coal mass

Key Points

• Mechanical response characterizes the strength and behavior of grouted coal mass under stress, enhancing safety.
• Key metrics include specific force thresholds indicating optimal reinforcement efficiency in fractured areas.
• Observational analysis illustrates how the damage model predicts failure patterns in fractured coal formations.
• Impacts structural engineering designs, as layered grouting may improve stability under load; more field tests needed.