This document discusses different types of earth and rockfill dams. It describes rolled fill dams which are constructed by compacting soil in thin layers. Homogeneous dams consist of a single material throughout while zoned dams have distinct core, shell, and filter zones. Diaphragm dams contain an impervious core like a thin wall. Key elements of earth dam design include the top width, freeboard, slopes, central core, and downstream drainage system.
Topics:
1. Types of Gravity Dam
2. Forces Acting on a Gravity Dam
3. Causes of failure of Gravity Dam
4. Elementary Profile of Gravity Dam
5. Practical Profile of Gravity Dam
6. Limiting height of Gravity Dam
7. Drainage and Inspection Galleries
Types- selection of the suitable site for the diversion headwork components
of diversion headwork- Causes of failure of structure on pervious foundation- Khosla’s theory- Design of concrete sloping
glacis weir.
Reservoir Planning: Introduction; Investigations for reservoir planning; Selection of site for a reservoir; Zones of storage in a reservoir; Storage capacity and yield; Mass inflow curve and demand curve; Calculation of reservoir capacity for a specified yield from the mass inflow curve; Determination of safe yield from a reservoir of a given capacity; Sediment flow in streams; Life of reservoir; Reservoir sediment control; flood routing. Various types of Spillways and design.
Canal fall- necessity and location- types of falls- Cross regulator and
distributory head regulator- their functions, Silt control devices, Canal
escapes- types of escapes.
Bligh’S CREEP THEORY
LIMITATIONS OF BLIGH’S THEORY
LANE’S WEIGHTED CREEP THEORY
KHOSLA’S THEORY AND CONCEPT OF FLOW NETS
COMPARISON OF BLIGH’S THEORY AND KHOSLA’S THEORY
Topics:
1. Types of Gravity Dam
2. Forces Acting on a Gravity Dam
3. Causes of failure of Gravity Dam
4. Elementary Profile of Gravity Dam
5. Practical Profile of Gravity Dam
6. Limiting height of Gravity Dam
7. Drainage and Inspection Galleries
Types- selection of the suitable site for the diversion headwork components
of diversion headwork- Causes of failure of structure on pervious foundation- Khosla’s theory- Design of concrete sloping
glacis weir.
Reservoir Planning: Introduction; Investigations for reservoir planning; Selection of site for a reservoir; Zones of storage in a reservoir; Storage capacity and yield; Mass inflow curve and demand curve; Calculation of reservoir capacity for a specified yield from the mass inflow curve; Determination of safe yield from a reservoir of a given capacity; Sediment flow in streams; Life of reservoir; Reservoir sediment control; flood routing. Various types of Spillways and design.
Canal fall- necessity and location- types of falls- Cross regulator and
distributory head regulator- their functions, Silt control devices, Canal
escapes- types of escapes.
Bligh’S CREEP THEORY
LIMITATIONS OF BLIGH’S THEORY
LANE’S WEIGHTED CREEP THEORY
KHOSLA’S THEORY AND CONCEPT OF FLOW NETS
COMPARISON OF BLIGH’S THEORY AND KHOSLA’S THEORY
a presentation about earth dams with a case study.
detailed presentation with everything related to earth dams
(introduction,advantages,disadvantages and alot more)
Tunnel Engineering: Introduction to tunneling
Size and shape of tunnel and suitability
Tunneling in hard rock, and soft material
Shield method
Safety measures
Ventilation, lighting and drainage of tunneling
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The financial system of a country is an important tool for economic development of the country, as it helps in creation of wealth by linking savings with investments.
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2. TYPES OF EARTH DAMS
Depending upon the method of
construction:
1- Rolled fill dam.
2- Hydraulic fill dam.
3. ROLLED FILL DAM
The embankment is constructed by placing
suitable soil materials in thin layers (15 to
30 cm) and compacting them with rollers.
The soil is brought to the site from burrow
pits and spread by bulldozers, etc., in
layers.
These layers are thoroughly compacted by
rollers of designed weights.
4. ROLLED FILL DAM
Ordinary road rollers can be used for low
embankments (such as for levees or
bunds); while power-operated rollers are
to be used for dams.
The moisture content of the soil fill must
be properly controlled.
5. ROLLED FILL DAM
The best compaction can be obtained at a
moisture content somewhere near the
optimum moisture content. (The optimum
moisture content is the moisture required
for obtaining optimum density in the fill).
Compaction of coarse gravels cannot be
properly done by rolling and is best done by
vibrating equipment.
6. HYDRAULIC FILL DAM
In this method of construction, the dam body
is constructed by excavating and transporting
soils by using water.
Pipes called flumes, are laid along the outer
edge of the embankment.
The soil materials are mixed with water and
pumped into these flumes.
The slush is discharged through the outlets in
the flumes at suitable intervals along their
lengths.
7. ROLLED-FILL DAMS
Rolled-fill earth dams can be sub-divided
into following types:
1- Homogeneous embankment type.
2- Zoned embankment type.
3- Diaphragm embankment type.
8. HOMOGENEOUS EMBANKMENT TYPE
The simplest type of an earthen embankment
consists of a single material and is homogeneous
throughout.
Sometimes, a blanket of relatively impervious
material may be placed on the upstream face.
A purely homogeneous section is used, when only
one type of material is economically or locally
available. Such a section is used to moderately
high dams for levees.
10. HOMOGENEOUS EMBANKMENT TYPE
A modified homogeneous section in which
internal drainage system (horizontal filter
drain or rock toe) is provided
Advantages:
controls the action of seepage, so as to
permit much steeper slopes.
11.
12.
13. ZONED EMBANKMENT TYPE
Zoned embankment type earth dam is
the one in which the dam is made up of
more than one material.
14. Consists of:
1- central impervious core
2- Shells: flanking the core and more
pervious
3- transition zone (optional)
4- drainage system
15. ZONED EMBANKMENT TYPE
The central core checks the seepage.
The transition zone prevents piping
through cracks which may develop in the
core.
The outer zone gives stability to the
central impervious fill and also distribute
the load over a large area of foundations.
16. ZONED EMBANKMENT TYPE
This type of embankment are widely
constructed and the materials of the zones
are selected depending upon their
availabilities.
Clay, inspite of it being highly impervious,
may not make the best core, if it shrinks and
swells too much. Due to this reason, clay is
sometimes mixed with fine sand or fine
gavel, so as to use it as the most suitable
material for the central impervious core.
17. ZONED EMBANKMENT TYPE
Silts or silty clays may be used as the
satisfactory central core materials.
Freely draining materials, such as coarse
sands and gravels, are used in the outer shell.
Transition filters are provided between the
inner zone and the outer zone, as shown in
fig.
This type of transition filters are always
provided, whenever there is an abrupt change
of permeability from one zone to the other.
18. ZONED EMBANKMENT TYPE
Function of shell layer:
1- Give stability to the central core.
2- Distribute the load over a larger area in
the foundation.
3- The upstream pervious zone affords
stability against rapid drawdown
4- The downstream pervious zone acts as
a drain to control the line of seepage
20. DIAPHRAGM TYPE EMBANKMENT
Material: impervious soil, cement concrete,
bituminous concrete.
Types: - Central vertical core
- a blanket at the upstream face
21. DIAPHRAGM TYPE EMBANKMENT
Diaphragm type embankments have a thin
impervious core, which is surrounded by
earth or rock fill.
The impervious core, called diaphragm, is
made of impervious soils, concrete, steel,
timber or any other material.
It acts as a water barrier to prevent
seepage through the dam.
22. DIAPHRAGM TYPE EMBANKMENT
The diaphragm may be placed either at the
centre as a central vertical core or at the
upstream face as a blanket.
The diaphragm must also be tied to the bed
rock or to a very impervious foundation
material, if excessive under-seepage
through the existing previous foundations
has to be avoided.
23. DIAPHRAGM TYPE EMBANKMENT
Difference between a diaphragm type and
zoned type:
The thickness of the diaphragm is less than
10 m or the height of embankment.
24. SECTION OF AN EARTH DAM
Empirical assumptions shall be made for:
1- Top width.
2- Free board.
3- Upstream and downstream slopes.
4- Central Impervious core.
5- Downstream Drainage system.
25. 1- TOP WIDTH
Z = height of the dam
b = top width or crest width
26. 2- FREE BOARD
Free board is the vertical distance between the
crest and the reservoir level.
Depends on Height and whether there is a spillway
on the dam or not.
27. 3- UPSTREAM AND DOWNSTREAM SLOPES
Assume upstream slope 3:1 and downstream
slope 2.5:1 or use the table given below:
28. 4- CENTRAL IMPERVIOUS CORE
1- The thickness of the core at any
elevation is not less than the height
of the embankment at that
elevation.
2- The width of the core at the crest
of the dam should be a minimum of
3 m
29. 5- Downstream drainage system
Types of drains:
1- Toe drains
2- Horizontal blanket drains
3- chimney drains