Study on Rock Burst Event Disaster and Prevention Mechanisms of Hard Roof

Table 2

Hard roof failure types, causes, and prevention methods.

Type	Cause	Prevention and control
Accumulated energy	Excessive stress concentration in the working face. Accumulated strain energy in the coal-rock mass exceeds the limit	Reduce stress concentration and decrease the extent of strain energy accumulation
Energy release
Strain energy release	The strain energy in the coal-rock mass in front of the working face is rapidly released when the hard roof breaks	Reduce the amount of strain energy released
Gravitational potential  energy release	Some part of the gravitational potential energy of the roof in the goaf is converted into vibrational energy, which is then transferred to a coal-rock mass with critical energy accumulation	Reduce the amount of gravitational potential energy released in the goaf