Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Table 1
Test schemes.
Scheme no.
Parameters of roadway and support
Vertical ground stress (MPa)
Lateral ground stress coefficient λ
1
Roadway: width 4.4 m, height 3.8 m Anchor bolt: length 2.2 m, diameter 18 mm, spacing 0.65 m × 0.8 m CFST arch: square section 150 mm × 8 mm, C40 concrete