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

Table 3

Design scheme of numerical simulation parameters.

Drilling location (Y) (m)	Borehole gas velocity (v)
5	1 m·s^−1, 2 m·s^−1, 3 m·s^−1, 4 m·s^−1, 5 m·s^−1, 6 m·s^−1, 7 m·s^−1
10	1 m·s^−1, 2 m·s^−1, 3 m·s^−1, 4 m·s^−1, 5 m·s^−1, 6 m·s^−1, 7 m·s^−1
15	1 m·s^−1, 2 m·s^−1, 3 m·s^−1, 4 m·s^−1, 5 m·s^−1, 6 m·s^−1, 7 m·s^−1
20	1 m·s^−1, 2 m·s^−1, 3 m·s^−1, 4 m·s^−1, 5 m·s^−1, 6 m·s^−1, 7 m·s^−1
25	1 m·s^−1, 2 m·s^−1, 3 m·s^−1, 4 m·s^−1, 5 m·s^−1, 6 m·s^−1, 7 m·s^−1
30	1 m·s^−1, 2 m·s^−1, 3 m·s^−1, 4 m·s^−1, 5 m·s^−1, 6 m·s^−1, 7 m·s^−1