Table 1 Peak dynamic stress corresponding to different HESE energy levels63.

From: Roof collapse in a retained top coal roadway induced by high-energy seismic events: implications from a case study

No.

Energy Level (J)

Frequency (Hz)

PPV (m/s)

Peak Dynamic Stress (MPa)

1

103~104

30

1.0

10

2

104~105

30

2.9

30

3

105~106

30

5.6

60

4

106~107

30

9.4

100

Back to article page