Research on the Characteristics of Coal Bump and Monitoring and Early Warning in Hujiahe Coal Mine

Table 2

Summary of peak intensity of 3 sets of coal samples.

Group	Paths	Peak intensity (MPa)	Average intensity (MPa)	Critical stress of coal bump (MPa)
	1	17.26	15.26	15.7
1	2	13.21
	3	15.32
	1	12.45	14.02
2	2	17.39
	3	12.24
	1	19.20	17.77
3	2	15.10
	3	19.00