Goaf Gas Control Improvement by Optimizing the Adjacent Roadway Large-Diameter Boreholes

Table 4

Distribution of spontaneous combustion zone in goaf at different positions ( = 6 m·s⁻¹).

Extraction location (m)	Inlet side (m)	Middle part (m)	Air-return side (m)
No extraction	65–85	53–75	18–35
5	67–88	70–96	11–25
10	69–91	73–100	16–30
15	73–93	76–105	22–33
20	75–95	80–110	25–36