Mechanism by Which Backfill Body Reduces Amount of Energy Released in Deep Coal Mining

Table 2

Statistics of microshock during extraction of 9301 and 1303 workface

Energy range	Number of microseismic events from No. 9301 backfill mining working face	Number of microseismic events from No. 1303 fully mechanized mining face
<1,000 J	143	743
1,000–3,000 J	60	349
3,000–5,000 J	16	165
5,000–10,000 J	6	42
>10,000 J	0	7
Total number of microseismic events	225	1,307
Maximum microseismic energy (J)	6,400	17,100
Average microseismic energy (J)	858	1,260