Stability Control of a Roadway Surrounding Rock during the Cutting and Pressure Relief of a Coal-Bearing Roof at a Shallow Mining Depth

Table 4

Key positions and maximum tensile stress of the anchor cable stress change curve.

Anchor cable stress monitoring point	Distance from opening to 12201 sides (m)	Curve increases its starting position (lag face distance) (m)	Maximum tensile stress of the anchor cable (kN)
No. 15	241	−31	124.1
No. 14	261	−26	232.6
No. 13	281	−41	286.7
No. 12	331	−13 (fully mechanized face stopped to 319 m)	225.2
No. 11	381	−63 (fully mechanized face stopped to 319 m)	221.3