Mechanism of stress-loaded rockburst in fully mechanized top-coal caving stope with deep overburden

The stress-loaded rockburst is a unique type of rockburst that occurs in some fully mechanized top-coal caving stopes with deep thick overburden, its occurrence mechanism is still unclear, leading to the failure to effective prevention and even serious accidents when the coal mine is faced with this type of rock burst. This study focuses on the stress-loaded rockburst that occurred in the 3304 fully mechanized top-coal caving face of the Zhaolou Coal Mine, Juye Coalfield, which lasted for 38 days and had a large range of impact warning (100 m ahead). Through material tests, theoretical analysis, numerical simulations, and field measurements, the study investigates the occurrence mechanism of stress-loaded rockburst in the fully mechanized top-coal caving stopes with deep thick overburden. The study proposes the spatial movement characteristics of overburden in the fully mechanized top-coal caving stopes with deep thick overburden through simulation tests and theoretical analysis. The contour expressions of co