Energy Variation Law and Rockburst Characteristics of Coal under Cyclic Loading

Table 1

Measurement results of the coal seam rockburst tendency.

	DT (ms)	WET	KE	σc (MPa)
Measured results	1166.4	3.2	12.9	19.5
Evaluation interval	>500	2–5	>5	>14
Index rockburst category	I	II	III	III
Evaluation rank	III, strong rockburst tendency

I- nonrockburst tendency; II- weak rockburst tendency; III- strong rockburst tendency.