coulomb's theory of earth pressure
coulomb's wedge theory of earth pressure
coulomb's expression for active pressure
coulomb's active earth pressure coefficient =Ka
vedio link
https://youtu.be/PSDwMjlTTGs
for numerical problem
https://youtu.be/ZPf3qAAtcpE
coulomb's theory of earth pressure
coulomb's wedge theory of earth pressure
coulomb's expression for active pressure
coulomb's active earth pressure coefficient =Ka
vedio link
https://youtu.be/PSDwMjlTTGs
for numerical problem
https://youtu.be/ZPf3qAAtcpE
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Thank you.
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Bearing capacity of shallow foundations by abhishek sharma ABHISHEK SHARMA
elements you should know about bearing capacity of shallow foundations are included in it. various indian standards are also used. Bearing capacity theories by various researchers are also included. numericals from GATE CE and ESE CE are also included.
General presentation of under-reamed piles. Mainly for diploma engineers, it is really helpful as its objective, dimensions, usage, etc are shown with proper images. It will really helpful for the basic knowledge of under-reamed piles.
Pile foundation is important for construction of foundation where bearing capacity of soil is poor. Pile foundation is use for distribution of uneven load of superstructure.There are so many type of pile are use for construction. Here i present some of pile with suitable condition for construction and methods for construction.
Thank you.
Diaphragm wall: Construction and DesignUmer Farooq
Diaphragm walls are concrete or reinforced concrete walls constructed in slurry-supported, open trenches below existing ground.
Concrete is placed using the Tremie installation method or by installing pre-cast concrete panels (known as a pre-cast diaphragm wall). Diaphragm walls can be constructed to depths of 150 meters and to widths of 0.5 to 1.50 meters.
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1. Seminar Presentation on
PILE FOUNDATION
Submitted to-
Mr. S.C. Verma
Civil Engg. Department
COER
Submitted By:-
Akash Deep Singh
Civil Engg.-4th year
Section – E
Roll No.- 06
2. What is pile foundation. . . .?
The pile foundation is used to describe a construction for the
foundation of a wall or a pier, which is supported on the pile.
Where it is placed …?
The piles may be placed separately or they may be placed in
the form of cluster throughout the length of the wall.
Where it is adopted …?
Piles are adopted when the loose soil extended to a great
depth.
The load of the structure is transmitted by the piles to hard
stratum below or it is resisted by the friction developed on the
sided
of the piles.
3. Application of piles……….
The piles are applicable at the places where,
The load coming from the structure is very high & the distribution
of the load on soil is uneven.
The subsoil water level is likely to rise or fall appreciably.
The pumping of subsoil water is too costly for keeping the
foundation trench in dry condition.
The construction of raft foundation is likely to be very expensive or
it is likely to practically impossible.
The piles are considered to be long when their length exceeds 30
meters.
The structure is situated on sea shore or river bed and the
foundation is likely to adopted by the scouring action of water.
The piles are also used as anchors. They may be designed to give
lateral support or to resist an upward pressure of uplift pressure.
4. Based on the function;
1. End bearing Pile
2. Friction Pile
3. Compaction Pile
4. Tension Pile or Uplift Pile
5. Anchor Pile
6. Fender Pile and Dolphins
7. Batter Pile
8. Sheet Pile
Based on the material & composition;
1. Concrete Pile
2. Timber Pile
3. Steel Pile
4. Composite Pile: Concrete & Timber, Concrete & Steel
Based on the method of installation;
1. Driven Pile
2. Cast-in-situ Pile
3.Driven and cast- in- situ Pile
Classification of Piles:
5. Loads coming on pile foundations
All the loads from the super structure like,
- Live loads
- Dead loads
- Wind loads
- Seismic load
The loads from the surrounding soil in case of
seismic event.
Water loads in case of off-shore structure.
6. Types of pile
I. Load bearing piles
II. Non-load bearing piles
I. Load bearing piles :-
It bear the load coming from the structure.
The Piles are generally driven vertically or in near vertical position.
When a horizontal forces to be resisted, the inclined piles may be
driven in an inclined position and such inclined piles are termed the
batter piles
Load bearing piles are divided into,
i. Bearing piles
ii. Friction Piles
7. Bearing piles
This piles penetrate to through the soft soil and
their bottoms rest on a hard bed. Thus, they are
end bearing piles and act as columns or piers.
The soft ground through which the piles pass also
gives some lateral support and this increases the
load carrying capacity of the bearing piles.
9. Friction piles
When loose soil extends to a great depth, the piles are
driven up to such a depth that the frictional resistance
developed at the sides of the piles equals the load
coming on the piles.
Great care should be taken to determine the frictional
resistance offered by the soil and suitable factor of
safety should be provided in the design.
11. Pile Driving
The process of forcing the piles into the ground
without excavation is termed as the pile driving.
The piles should be driven vertically.
However, a tolerance of eccentricity of 2 % of the pile
length is permissible.
The eccentricity is measured by means of plumb bob.
The equipments required for pile driving are as
follows,
i. Pile fames
ii. Pile hammers
iii. Leads
iv. Winches
v. Miscellaneous
12. Piles are commonly driven by means of a
hammer supported by a crane or a special
device known as a Pile Driver.
Hammers adopted for driving the pile are of
the following types:
1. Drop hammer
2. Single acting hammer
3. Double acting hammer
4. Diesel hammer
5. Vibratory hammer.
Pile Driving
13. What is ultimate load bearing capacity?
What is allowable load and how is it determined?
Ultimate load bearing capacity of a pile is defined as
the maximum load which can be carried by a pile and
at which the pile continues to sink without further
increase of the load.
The allowable load is the safe load which the pile can
carry safely, which can be determined from ultimate
load bearing capacity dividing by suitable F.O.S.
Load carrying capacity of Pile:
14. Factors affecting pile capacity
Surrounding soil
Installation technique (like driven or bored).
Method of construction (like pre cast or cast in situ).
Location of pile in a group.
Spacing of piles in a group.
Symmetry of the group.
Shape of pile cap
Location of pile cap (like above soil or below soil).
Drainage condition in soil.
15. The load carrying capacity of a pile can be
determined by the following methods:
1) Dynamic formulae
2) Static formulae
3) Pile load tests, and
4) Penetration test
Methods of determining
‘Load carrying capacity’
16. Embedded
Length = D
Qu = Ultimate Bearing Capacity
Qs = fAs
f = Unit Frictional Resistance
AS = Shaft Area (Pile surface area)
qb = Unit Bearing Capacity
Ab = Area of Pile Base
Qb = qbAb
Bearing capacity of piles
from soil parameters:
Static Formula Method
(Qu = Qb + Qs)
Pile capacity
o Theoretical Approach :- In this approach the pile capacity is
calculated using some formula in which the soil data is fed for
obtaining the capacity.
17. Non - Load bearing piles
This piles are used to function as the separating members below
ground level and they are generally not designed to take any
vertical load.
This piles are also known as the sheet piles.
The materials used for the construction of non load bearing piles
are,
i. Timber sheet piles
ii. Steel sheet piles
iii. Concrete sheet piles
18. Non - Load bearing piles
• Non load bearing piles are used for the following purposes.
To isolate foundations from the adjacent soils. This
prevents escape of soil and passage of shocks and
vibrations to adjoining structure.
To prevent underground movement of water like to
construct a cofferdam, it requires a water tight enclosure in
the construction of foundation under water.
To prevent the transfer of machine vibrations to the
adjacent structures.
To construction of retaining wall.
To protect the river banks.
To retain the sides of foundation trenches.
19. Negative friction is a down-
ward drag acting on a pile
due to the downward mo-
vement of the surrounding
compressible soil relative
to the pile.
It is shown in figure aside.
Figure shows the pile pass-
ing through a recently con-
structed cohesive soil fill.
The soil below the fill is
completely consolidated
under its overburden
pressure.
Negative Skin Friction
20. Negative Skin Friction will occur due to the
following reasons:
When the surrounding compressible soil
has been recently filled.
If the fill material is loose cohesion less soil.
By lowering the ground water which increases
the effective stress causing consolidation of the
soil with resultant settlement and friction force
being developed on the pile.
It also occurs when the fill is over the peat or a
soft clay stratum.
Cont...
21. Factors governing the selection of piles
They are:
Length of the pile in relation to the load and type of soil,
Characters of structure,
Availability of the materials,
Types of loading,
Factors causing deterioration,
Ease of maintenance,
Estimated cost of types of piles, taking into account the
initial cost, life expectancy and cost of maintenance and,
Availability of funds.
Selection of Pile