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

Figure 5

Gas distribution in goaf under different parameters. (a) Gas distribution in goaf without drainage. (b) Gas distribution under the condition of drainage (x = 10 m,  = 3 m·s⁻¹). (c) Gas distribution in goaf without drainage (x = 20 m,  = 5 m·s⁻¹).

(a)

(b)

(c)