Study on Numerical Simulation of Fire Danger Area Division in Mine Roadway

Table 5

Results of comprehensive classification of hazardous areas.

Time	Index	Safe area (I) (m)	Slightly dangerous area (II) (m)	Moderately dangerous area (III) (m)	Highly dangerous area (IV) (m)
10 s	L1	(0,1.6)∪(6.7,11)	(1.6,6.7)	None	None
	L2	(0,0.2)∪(6.8,11)	(0.2,0.4)∪(3.6,6.8)	(0.4,1)∪(1.5,3.6)	(1,1.5)
20 s	L1	(0,1.6)	(1.6,2.4)∪(4.2,11)	(2.4,4.2)	None
	L2	(0,0.1)	(0.1,0.4)∪(4.2,11)	(0.4,1)∪(1.6,4.2)	(1,1.6)
30 s	L1	(0,1.6)	(1.6,2.3)∪(5.5,11)	(2.3,5.5)	None
	L2	(0,0.1)	(0.1,0.4)∪(4.5,11)	(0.4,1)∪(1.7,4.5)	(1,1.7)
40 s	L1	(0,1.6)	(1.6,2.2)∪(6.8,11)	(2.2,6.8)	None
	L2	(0,0.1)	(0.1,0.4)∪(4.8,11)	(0.4,0.9)∪(1.8,4.8)	(0.9,1.8)
50 s	L1	(0,1.6)	(1.6,2.2)∪(8.1,11)	(2.2,8.1)	None
	L2	(0,0.1)	(0.1,0.4)∪(5.2,11)	(0.4,0.8)∪(1.9,5.2)	(0.8,1.9)
60 s	L1	(0,1.6)	(1.6,2.1)∪(9.5,11)	(2.1,9.5)	None
	L2	(0,0.1)	(0.1,0.3)∪(5.7,11)	(0.3,0.7)∪(2,5.7)	(0.7,2)