Experimental study on multi-parameter performance differences of coal with different rockburst tendencies

Addressing the difficult issue of precursor damage warning signs for the destruction of coal with different rockburst tendency, this paper conducted research on the multi-parameter evolution laws by acoustic-thermal-energy synchronization experiments. The results show that as rockburst tendency increases, UCS, elastic strain energy density, energy ringing count, cumulative energy counts, and AE impact intensity all increase significantly; the post-peak stress-strain curve is gradually steeper and the impact damage is more severe that because the denser structure accumulates more elastic energy, causing severe impact damage; moreover, the damage form gradually changes from shear to split damage, triggering the infrared radiation temperature changing from warming to cooling type. Disaster precursor signatures appear in each covariate respectively; and a calm zone appears in the energy ringing counts of coal specimens with weak and strong rockburst tendency; as rockburst tendency increases, the b-value precursor signature points fall behind, being 87%, 95.3%, and 97.9% of the UCS, respectively; correspondingly, a calm period appears in the infrared radiant temperature, but lags behind the signals of acoustic emission and UCS. There are differences in homologous monitoring information, mainly due to the different densification, strength and damage form. This paper lays a foundation for rockburst prevention and control.