Inverse analysis of dynamic failure characteristics of roadway surrounding rock under rock burst

Rock burst is one of the most serious dynamic disasters in process coal resources mining, order to study its occurrence mechanism and characteristics impact on roadways. Based No. 25110 working face Yuejin Mine Yi Coal 21032 return air uphill event Qianqiu Mine, combined with geological conditions, shock location, source waveform, this paper uses numerical simulation inverse response roadway surrounding rock under burst. The results show that plastic strain energy density mainly distributed around roadway, maximum 3.30 × 107 J at 75 ms, all masses are damaged, damage variable value 0.44. mine lower side 2.68 108 80 1.76, indicating roof two sides have been damaged after impact. simulation, gradient criterion tendency was proposed, degree accumulation measured by change amplitude gradient, index quantified, which provides a new method for prediction