Cofferdam Design
Transcript of Cofferdam Design
So
il P
rop
ert
ies
So
il u
nit
Str
ata
Th
k
(m)
γ'
(kN
/m3)
Su
(kP
a)
Eu
Co
hesiv
e
(Mp
a)
c'
(kP
a)
Φ'
E'
Gra
nu
lar
(Mp
a)
νK
oP
erm
eab
ilit
y *
***
(m/s
)
Riv
er
deposi
t R
ecent
Silt
219
20
35
25
20.3
0.5
1 x
10
-4 (
valu
e
taken f
rom
mari
ne
low
energ
y
deposi
ts)
Jolim
ont
Cla
yA
ssum
ed a
s F
BS
619
110
22
37
21
16
0.3
11 x
10
-9
Upper
Fis
herm
ens
Bend S
ilt (
FB
S)
Slig
htly O
verc
onso
lidate
d
Stiff
Silt
y C
lay
519
110
22
37
21
16
0.3
1.3
1 x
10
-9
Low
er
Fis
herm
ens
Bend S
ilt (
FB
S)
Slig
htly O
verc
onso
lidate
d
Stiff
Silt
y C
lay
619
110
22
37
21
16
0.3
1.5
1 x
10
-9
Mora
y S
treet
Gra
vel
Dense
Sand
719
--
035
50
0.3
50.4
1 x
10
-7
Collu
viu
mlo
ose
rock d
ebri
s
accum
ula
ted d
ue t
o g
ravity
618
30*
20
535
20
0.3
50.4
**1 x
10
-7
Mudst
one
extr
em
ely
weath
ere
d r
ock
(resi
dual so
il)
522
100
70
20
31
50
0.3
50.5
***
1 x
10
-7
* V
alu
e n
eed t
o b
e r
evie
wed.
FB
S is
overc
onso
lidate
d a
nd a
bove t
he C
ollu
viu
m,
so C
ollu
viu
m is
likely
to h
ave a
hig
her
valu
e t
han F
BS
.
** V
alu
e n
eed t
o b
e r
evis
ed a
s usi
ng t
his
valu
e w
ith low
Su,
in t
he insi
tu s
tage,
the s
oil
has
faile
d.
Either
Su o
r K
o h
as
to b
e r
evis
ed t
o b
e m
ore
realis
tic.
***
Valu
e n
eed t
o b
e r
evie
wed.
****
Perm
eabili
ty v
alu
es
need t
o b
e r
evie
wed.
They a
re a
ssum
ed b
ase
d o
n t
ypic
al valu
es.
An
aly
sis
1
So
il u
nit
Str
ata
Th
k
(m)
γ'
(kN
/m3)
Su
(kP
a)
Eu
Co
hesiv
e
(Mp
a)
c'
(kP
a)
Φ'
E'
Gra
nu
lar
(Mp
a)
νK
oP
erm
eab
ilit
y (
m/s
)A
naly
sis
Riv
er
deposi
t R
ecent
Silt
219
20
35
25
20.3
0.5
1 x
10
-4
U
ndra
ined
Jolim
ont
Cla
yA
ssum
ed a
s F
BS
619
110
22
37
21
16
0.3
11 x
10
-9U
ndra
ined
Upper
Fis
herm
ens
Bend S
ilt (
FB
S)
Slig
htly O
verc
onso
lidate
d
Stiff
Silt
y C
lay
519
110
22
37
21
16
0.3
1.3
1 x
10
-9U
ndra
ined
Low
er
Fis
herm
ens
Bend S
ilt (
FB
S)
Slig
htly O
verc
onso
lidate
d
Stiff
Silt
y C
lay
619
110
22
37
21
16
0.3
1.5
1 x
10
-9U
ndra
ined
Mora
y S
treet
Gra
vel
Dense
Sand
719
--
035
50
0.3
50.4
1 x
10
-7D
rain
ed
Collu
viu
mlo
ose
rock d
ebri
s
accum
ula
ted d
ue t
o g
ravity
618
30
20
535
20
0.3
50.8
*1 x
10
-7U
ndra
ined
Mudst
one
extr
em
ely
weath
ere
d r
ock
(resi
dual so
il)
522
100
70
20
31
50
0.3
50.5
1 x
10
-7U
ndra
ined
* V
alu
e r
evis
ed f
rom
0.4
to 0
.8 t
o u
se S
u =
30kP
a.