Dynamic Changes in Surface Damage Induced by High-Intensity Mining of Shallow, Thick Coal Seams in Gully Areas

Table 4

Angle parameters of static surface movement.

Direction	Angle of draw (°)	Angle of critical deformation (°)	Average value (angle of draw) (°)	Average value (angle of critical deformation) (°)
Mining line direction	58.6–60.5	59.8–62.7	59.0	61.3
Face line direction	59.3–64.7	67.1–69.4	61.4	68.9