11 ar 23, farrukh nadeem deep fuondation

7/29/2019 11 AR 23, Farrukh Nadeem Deep Fuondation

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DEEP FONDATION

PRESNTED BY,

FARRUKH NADEEM

B.ARCH. 3RD YEAR


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WHAT IS FOUNDATION?

A foundation is a structure that transfer the loads

to the earth or the supporting ground.

The supporting ground could be soil, rock or

sea bed.


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FUNCTION OF FOUNDATION

Transfer the load into ground.

Prevent settlement of

structure.


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Prevent possible movement of structure due toperiodic shrinkage or swelling of subsoil.

Allow building over water.

Resist lateral forces due to soil movement.

Resist uplifting or

overturning forces due to

wind


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THERE ARE TWO BASIC TYPE OF

FOUNDATIONS;

1.SHALLOW FOUNDATION

Shallow foundation transfer the load to the soil

at the base of the sub- structure.2.DEEP FOUNDATION

Deep fondation transfer the load far below the

sub-structure.


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TYPES OF DEEP FUNDATION

WELL FONDATION

PILE FOUNDATION


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WELL FOUNDATION

ADVANTAGE OF WELL FOUNDATION

Well foundation provides a solid and massive

foundation for heavy load.

Well are hollow and most of the material is at

periphery. This provide large sectional modulus with

minimum area.

It is possible to sink well at greater depth without

any difficulty.


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PARTSOF WELL


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COMMON TYPE OF WELL

FOUNDATION

CIRCULAR

ADVANTAGE

Simplicity in

constructionEase in sinking

Chances of tilting are

minimum

DISADVANTAGE

Costly

Maximum length is about 11m.


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DOUBLED WELL

ADVANTAGE

Greater lateral stability.

Used in long bridges.

DISADVANTAGE

More prone to tilt.

Vertical cracks developed.


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PILE FOUNDATIONS

Piled foundation is a form of foundation usingpiles to transfer the loads of a structure down to a

firm soil stratum with sufficient load-taking

capacity.

MATERIALS FOR THE PILES CAN BE OF:

Timber

Concrete

Steel piles in horcircular section


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WHEN IS IT NEEDED?

Top layers of soil are highly compressible .

Lateral forces are relatively prominent.In presence of expansive and collapsible soils at the

site.

Offshore structures

Strong uplift forces on shallow foundations due to

shallow.

For structures near flowing water (bridge abutments,

etc.)To avoid the problems due to erosion.


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PILED FOUNDATION DEPENDS ON

SEVERAL FACTORS, SUCH AS:

Depth of sound subsoil.

Constituents and nature of subsoil (e.g. Existing of

boulders, cohesive/non-cohesive nature of soil etc.)

Loading condition of pile

Layout of the structure


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LOADING SUPPORTS TO PILE

End-bearingload is support byresting onto a firm stratum such as

bed-rock or stratum of subsoil withthe required bearing capacity.


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Skin frictionload issupport by the frictional

resistance so created between

the contact surface of the pile

and the embracing soil.


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TYPES OF PILES

STEEL PILES

PIPE PILES

ROLLED STEEL H-SECTION PILES

CONCRETE PILES

PRE-CAST PILES

CAST-IN-SITU PILES

BORED-IN-SITU PILES

TIMBER PILES

COMPOSITE PILES


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STEEL PILES:USUAL LENGTH: 15 M60 M

USUAL LOAD: 300 KN1200 KN

ADVANTAGE:Relatively less hassle during installation and easy to

achieveCut-off level.

High driving force may be used for fast installation

Good to penetrate hard strata

Load carrying capacity is high


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DISADVANTAGE:

Relatively expensive Noise pollution during installation

Corrosion

Bend in piles while driving


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CONCRETE PILES:PRE-CAST PILES:

USUAL LENGTH: 10 M45 M

USUAL LOAD: 7500 KN8500 KN

ADVANTAGE:

Relatively cheap It can be easily combined with

Concrete

Corrosion resistant

It can bear hard drivingDISADVANTAGE:

Difficult to transport.

Difficult to achieve desired

Cut-off.


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FOUNDATION USING STEEL H-PILE

FEATURES OF H-PILE:

Variety of standard pile sizes to fit different loading

requirement

Guaranteed integrity of pile

Ease of handling & driving.

Easy to connect piles by site welding.

Able to penetrate small boulders (certain deflection may

occur)Allow for buckling if driven to greater depth


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FOUNDATION USING PRECAST

CONCRETE PILE:

FEATURES OF CONCRETE PILE:

Maximum allowable loads up to

3000 kN per pilePiles made of high strength concrete up to 75 mpa

Easy to connect by welding the embedded steel end

plate to lengthen pile to reach required depth

Relatively reliable if handle and drive properly.


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THANKS

11 ar 23, farrukh nadeem deep fuondation

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