Investigations into the failure mechanisms of coal bursts based on a real burst event in the Tangshan coal mine

To investigate the failure mechanisms of coal bursts in longwalls underground mines, a case study based on real burst Tangshan mine occurring 2 August 2019 was carried out to analyze cause and basic theories and, thus, propose approaches methods mitigate damage. The occurred mainly due sliding from longwall ribs simultaneous uplifting floor. As result retraction, roof above seam too stable collapse, forming long hanging behind longwall. Because acted as fulcrum, like saw, exerting massive loads result, front tended slope upward, leaving underlying unconfined. Due horizontal stresses, collapsed into longwall, causing break out. These findings could help improve fundamental understanding breakouts aid development measures prevent such occurrences.