Table 2 Criteria for determining impact propensity of coal.

From: Experimental study on the impact of “IDS + JFCS” complex wetting agent on the characteristics of coal bodies

Form

Dynamic destruction time (ms)

Impact energy index

Uniaxial compressive strength (Mpa)

Propensity to shock

Category I

DT > 500

KE < 1.5

σc < 7

None

Category II

50 < DT ≤ 500

1.5 ≤ KE < 5

7 ≤ σc ≤ 14

Weak

Category III

DT < 50

KE ≥ 5

σc ≥ 14

Vigorous

Back to article page