Shock and Vibration / 2015 / Article / Tab 2

Research Article

The Mechanism and Application of Deep-Hole Precracking Blasting on Rockburst Prevention

Table 2

Classification of bursting proneness of coal.

ClassificationType IType IIType III

Bursting pronenessNoneWeakStrong
Indexes
 Duration of dynamic fracture ()/ms > 50050 < ≤ 500 ≤ 50
 Elastic strain energy index () < 22 ≤ < 5 ≥ 5
 Bursting energy index () < 1.51.5 ≤ < 5 ≥ 5
 Uniaxial compressive strength ()/MPa < 77 ≤ < 14 ≥ 14

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