Cofferdam Design

39

Transcript of Cofferdam Design

Page 1: Cofferdam Design
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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.

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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.

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