Citation

Mu Z, Liu G, Yang J, Zhao Q, Javed A, Gong S, Cao J. Safety Sci. 2019; 114: 1-11.

Copyright

(Copyright © 2019, Elsevier Publishing)

DOI

10.1016/j.ssci.2018.12.016

PMID

unavailable

Abstract

The floor dynamic rupture 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 investigate the triggering conditions of the floor buckling, this study established a cusp catastrophe model based on elastic thin plate theory. During the occurrence of floor dynamic rupture process, the released energy was calculated, using elasticity modulus (E), Poisson ratio (μ), thickness (h), roadway width (a), maximum cohesion (σ0) and horizontal stress (σh) as influencing factors. Furthermore, by utilizing discrete element method (UDEC), and applying an artificial source in the model, a fish function was developed to harness the released kinetic energy (Ek) and its vibration curves. The results indicated that the main control factors of the floor dynamic rupture were the roadway width and horizontal stress, both of which had a positive correlation with the floor dynamic rupture risk. According to seismic computed tomography, the high horizontal stress in the 1306 LCF was verified through the evolution of P-wave velocity. The above mentioned findings, coupled with the catastrophe theory, UDEC and seismic computed tomography, could propose a certain reference for the pre-warning and prevention of the floor dynamic rupture.

Language: en

Keywords

Catastrophe theory; Floor dynamic rupture; High horizontal stress; Numerical simulation; Seismic computed tomography