Chapter 11 Slope Stabilization and Stability of Cuts

Figure 11.4 Continued. (Adapted from Gray & Leiser, 1982)
H
H
6
1
20"
B
B
1
2
4
3
5
6
Flat Backfill (smooth face)
1
1
2
3
4
5
6
1.5
β = 34°
No of
levels
No. of
levels
Fill at 1 1/2:1 (face with steps)
No. of
gabions
(per
width)
b. Standard design for Gabion Retaining Structures up to 20 feet in height (6 meters) with
flat or sloping backfill.
H
H
1 3' 3" 3' 3" 1
2 6' 6" 4' 11" 11/2
3 9' 9" 6' 6" 2
4 13' 1" 8' 2" 21/2
5 16' 4" 9' 9" 3
6 19' 7" 11' 5" 31/2
B
B
No. of
gabions
(per
width)
1 3' 3" 3' 3" 1
2 6' 6" 4' 3" 11/2
3 9' 9" 5' 3" 2
4 13' 1" 6' 6" 2
5 16' 4" 8' 2" 21/2
6 19' 7" 9' 9" 3
Note: Loading conditions are for silty sand to sand and gravel back fill. For finer or clay rich soils,
earth pressure on the wall will increase and the wall base width (B) will have to increase for each
height. Backfill weight = 110 pcf. (1.8 Tons/m 3 ) (1,762 kg/m 3 )
- Safe against overturning for soils with a minimum bearing capacity of 2 Tons/foot 2 (19,500 kg/m 2 )
- For flat or sloping backfills, either a flat or stepped face may be used.
LOW-VOLUME ROADS BMPS: 111