Suction Anchor May 2015

7/23/2019 Suction Anchor May 2015

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CAPACITY OFSUCTION CAISSON


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CONTENTS

Objective

What is suction caisson?

Installation of suction caisson Why suction caisson?

How to study?

Results


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CONTENTS


Installation of suction caisson

Why suction caisson? How to study?

Result


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CONTENTS

WHAT IS SUCTION CAISSON?



Result


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Suction Caisson

buckets, skirted foundations and suction anchors

Upturned steel bucket install by suction of air or water out of the

water cavity


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used in:

the oil and gas industry in the construction of platforms

now, looking forward for wind turbines foundation development

1stintroduced by Senpere and Auvergne (1982) as mooring

anchors for a storage tanker in the Gorm field located offshore

Denmark.


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CONTENTS


INSTALLATION OF SUCTION CAISSON


Results


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Launched from an installation vessel, landed softly on the sea floor

Lowered to the sea floor with the valves open so that the enclosed air

can escape rapidly

Once the suction caisson has penetrated the sea floor under its own

weight, the relief valves are closed


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Removing the trapped water from the suction caisson by means of

pumps mounted on the top

Difference between the external hydrostatic water pressure and the

inside of the suction caisson generates the driving force for soil

penetration

Pumping is stopped after reaching the desired depth

Pumps are recovered for reuse elsewhere


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CONTENTS



WHY SUCTION CAISSON?

How to study?

Results


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Pile foundations for offshore platforms:

traditionally designed based on yield of an individual pile

require heavy duty piling equipment

time consuming and expensive

type is not suitable for locations with many large boulders in the

seabed

Most of the offshore foundation and structure used pile foundation

instead of suction caisson.

Failure mechanism of piles


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Suction caisson:

it is easy to install within one day at precise location

environmentally friendly

incur less decommissioning issues as it can be easily by

reverse the direction of the pumping

lower cost

besides supporting platform, suction caisson can also be

designed for storing oil during oil extraction.


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Contents



Why suction caisson?

Results


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CAPACITY OFSUCTION CAISSON

VERTICALLOADING HORIZONTALLOADING UPLIFTLOADING

SAND CLAY SAND CLAYSAND CLAY

SELFWEIGHTPENETRATION

SUCTIONASSISSTED

PENETRATION

LIMIT TOSUCTION

PENETRATION


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Loading Condition

Acquire value of parameters involved.

Substitute all the parameters into the formula.

Formulate calculation file in Microsoft Excel

Acquire formula involved in the calculation

Generate graph from the calculation to compare the behavior


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CONTENTS



Why suction caisson?

RESULTS


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RESULTVERTICAL LOAD

Self weight Penetration (Clay)

Vertical Load versus Z/h in Clay

0.00

2,000.00

4,000.00

6,000.00

8,000.00

10,000.00

12,000.00

14,000.00

16,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/h

VerticalLoad(kN)

DtNshNDshDshV cuqiuiouo 211 ''


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Vertical Load versus Z/D in Clay

0.00

2,000.00

4,000.00

6,000.00

8,000.00

10,000.00

12,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/D

VerticalLoad(kN)

DtNshNDshDshV cuqiuiouo 211 ''

RESULTVERTICAL LOAD

Self weight Penetration (Clay)


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RESULTVERTICAL LOAD

Self weight Penetration (Sand)

Vertical Load versus Z/h in Sand

0.00

50,000.00

100,000.00

150,000.00

200,000.00

250,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/h

VerticalLoad(kN)

DtNthNDKhDKhV qiioo

2''tan

2

'tan

2

''

22


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RESULTVERTICAL LOAD

Self weight Penetration (Sand)

Vertical Load versus Z/D in Sand

0.00

10,000.00

20,000.00

30,000.00

40,000.00

50,000.00

60,000.00

70,000.00

80,000.00

90,000.00

100,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/D

VerticalLoad(kN)

DtNthNDKhDKhV qiioo

2

''tan2

'tan

2

''

22


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RESULTVERTICAL LOAD

Suction Assisted Penetration (Clay)


0.00

2,000.00

4,000.00

6,000.00

8,000.00

10,000.00

12,000.00

14,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/h

VerticalLoad+Suction(kN)

DtNshDshDshD

sV cuiuiouoo

211

2

'4

'


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RESULTVERTICAL LOAD

Suction Assisted Penetration (Clay)


0.00

1,000.00

2,000.00

3,000.00

4,000.00

5,000.00

6,000.00

7,000.00

8,000.00

9,000.00

10,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/D


DtNshDshDshD

sV cuiuiouoo

211

2

'4

'


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RESULTVERTICAL LOAD

Suction Assisted Penetration (Sand)


-500,000.00

0.00

500,000.00

1,000,000.00

1,500,000.00

2,000,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/h


DttNN

Z

hZ

h

sa

DKZ

h

Z

hZh

saDKZ

h

Z

hZh

asDsV

q

i

i

ii

ii

ooo

oo

oi

}'1exp1

'

tan1exp1'tan1exp'4

' 222


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RESULTVERTICAL LOAD

Suction Assisted Penetration (Sand)

Vertical Load versus Z/D in Sand

0.00

200,000.00

400,000.00

600,000.00

800,000.00

1,000,000.00

1,200,000.00

1,400,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/D


DttNN

Z

hZ

h

sa

DKZ

h

Z

hZh

saDKZ

h

Z

hZh

asDsV

q

i

i

ii

ii

ooo

oo

oi

}'1exp1

'

tan1exp1'tan1exp'4

' 222


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RESULTVERTICAL LOAD

Limit to Penetration (Clay)


0.00

500.00

1,000.00

1,500.00

2,000.00

2,500.00

3,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/D

LimittoSuctionPenetration(kN)

DtNshDD

DDsh

DsuNV cu

om

iouo

ic

222

2

1

2*

'14

2'


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RESULT & FINDINGVERTICAL LOAD

Limit to Penetration (Clay)


0.00

200.00

400.00

600.00

800.00

1,000.00

1,200.00

1,400.00

1,600.00

1,800.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/h

LimittoSuctionPenetration(kN)

DtNshDD

DDsh

DsuNV cu

om

iouo

ic

222

2

1

2*

'14

2'


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RESULTVERTICAL LOAD

Limit to Penetration (Sand)


0.00

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Z/h

L

imittoSuction(kN)

DttN

DonKZ

h

Z

hZ

aa

DhV o

oo

oi

'

tan1exp1

'

41

''

22


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RESULTHORIZONTAL LOAD (Clay)

Horizontal Capacity versus L/d in Clay

0.00

200.00

400.00

600.00

800.00

1,000.00

1,200.00

-1.00 1.00 3.00 5.00 7.00 9.00 11.00

L/d

HorizontalLoad(kN

)3

2( Luhu AsNH 4

44

3.6

L

d

L

d

Nh

3785.0

02.7

DL

DL

e775.0

58.1


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RESULTHORIZONTAL LOAD (Clay)

Horizontal Capacity versus L/D in clay

0.00

200.00

400.00

600.00

800.00

1,000.00

1,200.00

1,400.00

-1.00 1.00 3.00 5.00 7.00 9.00 11.00

L/D

HorizontalLoad(kN)

)3

2( Luhu AsNH 4

44

3.6

L

d

L

d

Nh

3785.0

02.7

DL

DL

e775.0

58.1


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RESULTHORIZONTAL LOAD (Sand)

Horizontal Capacity versus L/d in Sand

0.00

2,000.00

4,000.00

6,000.00

8,000.00

10,000.00

12,000.00

14,000.00

16,000.00

18,000.00

20,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

L/d

H

orizontalLoad(kN

Ld

DL

Qu

2

245tan' 023


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RESULTHORIZONTAL LOAD (Sand)

Horizontal Capacity versus L/D Sand

0.00

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

L/D

HorizontalLoad

(kN)

Ld

DL

Qu

2

245tan' 023


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RESULTUPLIFT LOAD (Clay)

Uplift Load versus L/d in Clay

0.00

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00L/d

UpliftLoad(kN

LsDNp tipuccu ')( 1833.0

8

D

LNcApV uu


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RESULTUPLIFT LOAD (Clay)

Uplift Load versus L/D in Clay

0.00

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

L/D

UpliftLoad(KN

LsDNp tipuccu ')( 1833.0

8

D

LNcApV uu


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RESULTUPLIFT LOAD (Sand)

Uplift Load versus L/d in Sand

0.00

50,000.00

100,000.00

150,000.00

200,000.00

250,000.00

300,000.00

350,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

UpliftLoad

(kN)

' )(5.0

5372.0

)( 'tan'sin11.9 bottomvnetu OCR

D

Lp

ApV uu


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RESULTUPLIFT LOAD (Sand)

Uplift Load versus L/D in Sand

0.00

50,000.00

100,000.00

150,000.00

200,000.00

250,000.00

300,000.00

350,000.00

0.00 2.00 4.00 6.00 8.00 10.00 12.00

L/D

HprizontalLoad(kN)

' )(5.0

5372.0

)( 'tan'sin11.9 bottomvnetu OCR

D

Lp

ApV uu


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CONTENTS

Objective


Installation of suction caisson Why suction caisson?

How to study?

Result


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CONTENTS




Results

Suction Anchor May 2015

Documents

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