Study of the Law of Hydraulically Punched Boreholes on Effective Gas Extraction Radius under Different Coal Outputs

Table 2

Parameters of effective extraction radius in different periods of the borehole with different coal outputs.

Coal output (t/m)	Effective borehole extraction radius (for different gas extraction time periods)
	30 days (m)	90 days (m)	180 days (m)
0.5	2.33	2.78	2.85
1.0	2.72	3.23	3.31
1.5	2.95	3.53	3.60