Quantitative Evaluation for the Threat Degree of a Thermal Reservoir to Deep Coal Mining

Table 20

Level characteristic values of borehole Qs1.

Parameter assignment	Threat level					Sum
	Safe (I)	Low threat (II)	Medium threat (III)	Relatively high threat (IV)	High threat (V)
,	0	0.0527	0.6169	2.8446	0.2845	3.7987
,	0	0.1081	0.6531	2.5344	0.4731	3.7685
,	0	0.0014	0.1643	3.7649	0.0167	3.9472
,	0	0.0073	0.2339	3.6254	0.0601	3.9267
Mean value	0	0.0424	0.4170	3.1933	0.2074	3.8603