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

Rock Cutting: Hyperbaric Conditions.
With:
sin sin
2 p2m sin 2 p2m
sin cos
A
sin
a 2
cos cos
sin
And:
1 p2m sin
B
cos 2 p1m
cos sin
sin sin
sin sin
c 2 cos cos a 1 cos cos
h
h
i
i
(9-24)
(9-25)
And:
sin
sin
1 p1m sin cos 1 p1m
sin
C h h
sin
c 1
cos cos
hi
h
sin
i
i
i
(9-26)
If hb,mhb the normal Flow Type will occur.
if h
if h
h then use h
b,m b b,m
h then use h
b,m b b
(9-27)
Now in the case of full cavitation, the adhesion can be neglected and both arms are at 50% of the corresponding
length. This simplifies the equations to:
sin
pm
cos sin
A
sin
sin sin
pm
sin c cos cos
B
h
i
(9-28)
sin
sin
pm
cos sin c cos cos
C h h
Introducing the ratio rz between the absolute hydrostatic pressure and the shear strength c:
w
g z
10
rz
(9-29)
c
i
i
Copyright © Dr.ir. S.A. Miedema TOC Page 307 of 454