Evaluation of Rock Burst Propensity and Rock Burst Mechanism in Deep Phosphate Mines: A Case Study of Sujiapo Phosphate Mine, Hubei Province, China

Rockburst is one of the major problems in rock underground engineering and mechanics. To make a risk assessment rockburst improve mine safety index, some evaluation systems for propensity have been proposed applied, progress has made study high-value mines single systems, but these are still immature deep low medium grade phosphate with more complex influencing factors. Therefore, to solve this problem, takes mining area Sujiapo as main research object, combines characteristics its physical mechanical properties; system fuzzy mathematical method multiple methods determine mine. The JSM-500LV SEM acoustic emission results used analyze microscopic mechanism from morphology composition rocks, rationality further demonstrated. shows that dolomite phosphorite moderate rockburst, shale weak tendency; because roof crystallization degree higher, elastic modulus large. Under action external load, stored strain energy. Deformation damage consumes less energy released outside world after large, likely occur brittle damage, tendency high. combining can comprehensively mines.