The 4th International Symposium on Mine Safety Science and Engineering (ISMSSE2018)

331 / 2018-05-04 21:22:05

Theory and Numerical Investigations of Floor Dynamic Rupture: A Case Study in Zhaolou Coal Mine, China

Numerical simulation,horizontal,seismic analysis,catastrophe,Dynamic response

Mine Dynamics Disaster > Rock burst impact

The floor dynamic rupture that occurred in the 1306 longwall coal face (LCF) in Zhaolou Coal Mine was induced due to the superposition of static and dynamic stresses. In order to explore the triggering condition of floor buckling, this study established the cusp catastrophe model based on elastic thin plate theory. During the occurrence of floor dynamic rupture process, the released energy was calculated, with the influencing factors, i.e., elasticity modulus ( ), Poisson ratio ( ), thickness ( ), roadway width ( ), maximum cohesion ( ) and horizontal stress ( ). Furthermore, by utilizing discrete element method (UDEC), and applying an artificial source in the model, a fish function was developed to get the released kinetic energy ( ) and its vibration curves with the above influencing factors. The results indicated that the main control factors of floor dynamic rupture were the roadway width and horizontal stress, both of which have a positive correlation with the floor dynamic rupture risk. According to seismic computed tomography, the high horizontal stress in the 1306 LCF was verified by the evolution of P-wave velocity. The above findings, coupled with the catastrophe theory, UDEC and seismic computed tomography, could imply a certain reference for pre-warning and prevention of floor dynamic rupture.