Study on Spontaneous Combustion Law and Prevention Technology of Abandoned Coal in Goaf of Coal Mine

Table 1

The test coal sample selection and coal sample numbers.

No.	Coal seam	Coal mine	Remarks
No. 1	Layer 4#	Jiudaoling Coal Mine in Liaoning Province	Coal seams are prone to spontaneous combustion. They are used as reference coal samples for this study. Long flame coal (bituminous coal)
No. 2	Layer 8#-1	Changping Coal Mine of Shanxi Jinmei Group 84301 working face of Fushan well	Spontaneous coal seam (class II), the metamorphism belongs to lean coal—anthracite stage
No. 3	Layer 8#-2
No. 5	Layer 15#	150405 working face in Duanwang Coal Mine in Shanxi Province	Spontaneous coal seam (class II). Lean coal (bituminous coal)
No. 6	Layer 8+9#	090506 working face in Duanwang Coal Mine in Shanxi Province	Spontaneous coal seam (class II). Between spontaneous combustion and nonspontaneous combustion. Lean coal (bituminous coal)
No. 8	Layer 11#	Duanwang Coal Mine in Shanxi Province	Unworkable seam, drill hole sampling
No. 9	Layer 13#
No. 89	Layer11# and 13#	Duanwang Coal Mine in Shanxi Province	Unworkable seam, drill hole sampling