DISTANCE FROM THE FACE OF
THE WALL TO THE BACK OF THE EXCAVATION
NO FENCE OR WIND PERMEABLE FENCE AT THE FACE
WALL HEIGHT
|
TOTAL WIDTH AT BASE OF WALL (B) mm
|
(H) mm
|
EMBANKMENT MATERIAL
|
|
STIFF
CLAY
|
SAND
|
GRAVEL
|
ROCK
|
500
|
600
|
400
|
350
|
280
|
1000
|
850
|
600
|
550
|
440
|
1500
|
1150
|
800
|
750
|
600
|
2000
|
1400
|
1050
|
950
|
750
|
2500
|
1650
|
1250
|
1150
|
910
|
3000
|
1950
|
1500
|
1350
|
1040
|
3500
|
2200
|
1700
|
1550
|
1255
|
4000
|
2450
|
1900
|
1750
|
1400
|
4500
|
2700
|
2150
|
1950
|
1540
|
5000
|
3000
|
2350
|
2150
|
1700
|
5500
|
3250
|
2600
|
2350
|
1900
|
6000
|
3500
|
2800
|
2550
|
2015
|
WIND IMPERMEABLE FENCE AT THE FACE
WALL HEIGHT
|
TOTAL WIDTH AT BASE OF WALL (B) mm
|
(H) mm
|
EMBANKMENT MATERIAL
|
|
STIFF
CLAY
|
SAND
|
GRAVEL
|
ROCK
|
500
|
600
|
400
|
350
|
280
|
1000
|
850
|
600
|
550
|
440
|
1500
|
1350
|
1250
|
1200
|
1150
|
2000
|
1550
|
1350
|
1300
|
1250
|
2500
|
1750
|
1500
|
1450
|
1400
|
3000
|
2000
|
1700
|
1600
|
1500
|
3500
|
2250
|
1850
|
1750
|
1255
|
4000
|
2500
|
2050
|
1900
|
1800
|
4500
|
2750
|
2250
|
2100
|
2000
|
5000
|
3050
|
2450
|
2250
|
2050
|
5500
|
3300
|
2650
|
2450
|
2250
|
6000
|
3550
|
2850
|
2600
|
2400
|
The above dimensions are based on the
following:
Characteristics of Clay: Thi = 25o;
Density = 20 kN/m2; Cohesion (c) = 75 kPa
Characteristics of Sand: Thi = 30o;
Density = 20 kN/m2; Cohesion (c) = 0 kPa
Characteristics of gravel: Thi = 35o;
Density = 19 kN/m2; Cohesion (c) = 0 kPa
Characteristics of Rock: Thi = 45o;
Density = 20 kN/m2; Cohesion (c) = 75
kPa; Ka = 0.18
Live load = 5 kPa; 5%
maximum backfill slope
Fence: 1.8m high to AS1170 wind loads
for a wind impermeable fence.
For walls up to 1 metre high the fence post is concreted into a post
hole before wall construction. The fence post passes through the empty
block cavities.
The width of RETAIN! will increase for higher surcharges