Applied Research of Water Jet Technology in Preventing Rock Burst Occurred in Roadways

Table 4

The parameters of burst energy index () under different states.

State	Number	Height/mm	Diameter/mm	Cross s section area/mm^2	Burst energy index	Mean burst energy index
Natural state	NS7	100	50	1962.5	4.7	5.4
	NS8	100	50	1962.5	5.1
	NS9	96	50	1962.5	6.3
Saturated water state	SWS7	102	50	1962.5	2.5	2.1
	SWS8	101	50	1962.5	1.4
	SWS9	98	50	1962.5	2.5