Table 2 Floor bolt design schemes.
From: Mechanism and control measures for floor heave in gob-side entry of weakly cemented soft rock
Scheme | Specific measures |
|---|---|
Scheme 1 | No floor bolts are installed on either side of the roadway. Only the original bolt-cable support from the excavation period is retained |
Scheme 2 | Based on the original support, a row of floor bolts is installed on both sides of the roadway. The bolts are inclined at 60° outward from the horizontal direction, with a spacing of 1.0 m and a length of 2.4 m |
Scheme 3 | Based on the original support, a row of floor bolts is installed on the coal pillar side of the roadway. The bolts are inclined at 60° outward from the horizontal direction, with a spacing of 1.0 m and a length of 2.4 m |
Scheme 4 | Based on the original support, a row of floor bolts is installed on the solid coal side of the roadway. The bolts are inclined at 60° outward from the horizontal direction, with a spacing of 1.0 m and a length of 2.4 m |
