Civil Engineering Reference
In-Depth Information
Plane B
Note: The flatter of the two planes is
always called plane A.
Plane A
Factor of safety
FS =
A
tan
A
+
B
tan
B
A/B chart—dip difference 0
°
5.0
4.5
4.0
3.5
3.0
2.5
Dip of plane
20
30
40
2.0
60
70
80
1.5
50
1.0
0.5
0
0
20
40
60
80
100
120
140
160
180
360
340
320 300 280 260
Difference in dip direction—degrees
240
220
200
Figure 7.8
Wedge stability charts for friction only: A and B charts for a dip difference of 0
◦
.
