The Delft Sand, Clay & Rock Cutting Model, 2019a

A Wedge in Dry Sand Cutting.
11.5. Experiments of Hatamura & Chijiiwa (1977B).
The experiments of Hatamura & Chijiiwa (1977B) were carried out with a blade length L4=0.2 m, a blade width
w=0.33 m, an angle of internal friction φ=38°, an angle of internal friction δ=2/3·φ, an angle of internal friction
on the pseudo blade of λ=32°, a dry density of ρs=1.46 ton/m 3 and a cutting velocity of vc=0.05 m/sec.
60
Shear Angle β vs. Blade Angle α
55
No Wedge hi=0.05 m
50
No Wedge hi=0.10 m
Shear Angle β (Degrees)
45
40
35
30
25
20
15
No Wedge hi=0.15 m
Experiments hi=0.05 m
Experiments hi=0.10 m
Experiments hi=0.15 m
Wedge hi=0.05 m
10
Wedge hi=0.10 m
5
Wedge hi=0.15 m
© S.A.M.
0
30 45 60 75 90 105 120 135 150
Blade Angle α (Degrees)
Figure 11-11: The shear angle of Hatamura & Chijiiwa (1977B) versus the calculated shear angles, with
and without wedge.
Shear Angle β, Wedge Angle θ & External Friction Angle δ e
(Degrees)
© S.A.M.
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
Shear Angle β, Wedge Angle θ & External Friction Angle δ m vs.
Blade Angle α
-30
60 75 90 105 120 135 150
Blade Angle α (Degrees)
Beta hi=0.05 m
Beta hi=0.10 m
Beta hi=0.15 m
Teta hi=0.05 m
Teta hi=0.10 m
Teta hi=0.15 m
Delta hi=0.05 m
Delta hi=0.10 m
Delta hi=0.15 m
Figure 11-12: The shear angle, wedge angle and mobilized external friction angle calculated with wedge.
Copyright © Dr.ir. S.A. Miedema TOC Page 341 of 454