Multi-parameter monitoring and advanced support research for rockburst hazard area under composite hard roof and its engineering application: A case study

Rockburst in the M302 working face of a mine was analyzed using field monitoring data. The primary cause was attributed to the interaction between strong disturbances from composite hard roof fractures and high abutment pressure. Data analysis and theoretical methods The primary cause was attributed to the interaction between strong disturbances from composite hard roof fractures and high abutment pressure. The main conclusions were as follows: 1) Advanced abutment pressure affected a zone extending 0–260 m ahead of the working face, with high-pressure zones up to 130 m and stress warning zones up to 100 m. The peak stress area was concentrated within 60 m of the working face. 2) Microseismic activity was concentrated within −30 to 100 m along the gob-side entry, with high-energy points clustered between −30 and 60 m. 3) The peak frequency of microseismic events occurred 50 m ahead of the face. Roof fracture disturbance extended 0–120 m, forming a stratified zone of micoseismic activity at heights of 10–30 m. 4) Zoned advanced support with high-pressure zones up to 130 m and stress warning zones up to 100 m. The peak stress area was concentrated within 60 m of the working face.