3.25).
=
0.19 m
(190 mm)
D50
=
0.23 m
(120 mm)
D16
=
0.28 m
(280 mm)
D90
D84
=
0.26 m
(260 mm)
=
0.23 m
(230 mm)
D75
D50 D84 1 0.19 m 0.26 m
1
G=
+
=
+
= 1.48
2
2 0.12 m 0.19 m
D16 D50
1000
800
600
500
400
300
200
100
80
60
50
40
30
20
10
100
90
80
70
60
50
40
30
20
10
0
Percent Finer
Figure 3.25. Size distribution curve for pebble count (1,000 mm = 1 m = 3.28 ft).
3.7.2 PROBLEM 2 Angle of Repose
Determine the angle of repose for well rounded riprap with a D30 of 1 ft = 305 mm. From
Figure 3.4 the angle of repose is 40o.
3.56
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