Table 2 Shock wave injury rating scale.

From: Experimental study of energy attenuation of protruding shock waves in mines under elastic device buffering

Damage degree

Specific injuries

Overpressure value (P/kPa)

Safety

Not injured

P < 20

Slight

Minor contusion

20 ≤ P ≤ 30

Medium

Hearing and tracheal injury

30 < P ≤ 50

Serious

Internal organs serious injury

50 < P ≤ 100

Fatal

Causing most people death

P > 100

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