Energy Evolution and AE Failure Precursory Characteristics of Rocks with Different Rockburst Proneness

Table 1

Rockburst prediction results based on multiple criteria.

Lithology	Depth (m)	Maximum elastic strain energy density		Brittleness index		Rockburst proneness index
		Es	Level	B	Level	Wet	Level
Metagabbro	761	172.9	III	14.9	III	3.76	III
Metagabbro	965	145.5	III	14.7	III	3.47	II
Metagabbro	1090	146.8	III	13.4	III	3.82	III
Granite	1415	247.0	IV	16.77	III	7.98	IV
Granite	1524	321.0	IV	19.5	IV	6.32	IV
Granite	1526	410.59	IV	21	IV	5.16	IV

II: weak rockburst proneness; III: moderate rockburst proneness; IV: strong rockburst proneness.