Multidimensional Analysis of Precursor Information of Rockburst during Loading and Unloading of Deep Diorite

Table 2

Fluctuation schedule of power spectrum entropy, singular spectrum entropy, and energy entropy.

Unloading rate	0.1 MPa/s	0.3 MPa/s	0.5 MPa/s	0.7 MPa/s
Steady sparse fluctuation	0 s ~ 285 s	0 s ~ 321 s	0 s ~ 270 s	0 s ~ 165 s
Frequent abnormal fluctuation	402 s ~ 653 s	367 s ~ 687 s	372 s ~ 776 s	322 s ~ 563 s