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 2

Parameters of model monitoring lines.

Survey line	Line position	Number	Point interval (cm)
I	52 m above the roof of 4# coal seam	25	10
II	42 m above the roof of 4# coal seam	25	10
III	32 m above the roof of 4# coal seam	25	10
IV	22 m above the roof of 4# coal seam	25	10
V	12 m above the roof of 4# coal seam	25	10
VI	2 m above the roof of 4# coal seam	25	10