Research on Pressure Relief Method of Close Floor Roadway in Coal Seam Based on Deformation and Failure Characteristics of Surrounding Rock in Deep Roadway

Figure 15

Displacement curve chart of surrounding rock in 213 floor roadway in Qujiang Coal Mine.

(a) Group 1 (244 m away from the tunneling head-on)

(b) Group 2 (208 m away from the tunneling head-on)

(c) Group 2 (116 m away from the tunneling head-on)