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

<div>Gas concentration of extraction borehole and upper corner under different parameters. (a) Gas concentration in drainage pipeline. (b) Gas concentration in upper corner.</div>

Advances in Civil Engineering

fig6

Figure 6

Figure 6: Goaf Gas Control Improvement by Optimizing the Adjacent Roadway Large-Diameter Boreholes 