Evolution Characteristics of a High-Level Asymmetric Fracture-Seepage Community and Precise Coalbed Methane Drainage Technology during Mining of Outburst-Prone Coal Seam Groups

Table 3

Parameters for borehole layout.

Borehole location	Side of track roadway			Side of belt roadway
Number of boreholes	1#	2#	3#	1#	2#	3#	4#	5#
Distance from roadway (m)	10	20	30	0	6	14	22	30
Layout layer height (m)	35.2	39.6	44	39.6	44	39.6	44	39.6
Borehole diameter (mm)	153	153	153	153	153	153	153	153