Physics, asked by abhijeetvashish798, 1 year ago

What is size if drainage holes of gravity dam as 6512-1984?

Answers

Answered by Devil8110
0

Answer:

Design Criteria

of

Gravity Dams

Analysis and design of Concrete Dams

As per structural behaviour:

 Gravity dams

 Buttress dams

 Arch dams

Classification of Concrete Dams :

Analysis and Design of Concrete Dams

EarthDams

:

They are trapezoidal in

shape

Earth dams are constructed

where the foundation or

the underlying material or

rocks are weak to support

the masonry dam or where

the suitable competent

rocks are at greater depth

.

Earthen dams are relatively

smaller in height and broad

at the base

They are mainly built with

clay, sand and gravel, hence

they are also known as

Earth fill dam or Rock fill

dam

Heel

Gallery

Toe

Crest

NWL

Normal

water level

MWL

Max. level

Free board

Sluice wa

Heel: contact with the ground on the upstream side

Toe: contact on the downstream side

Abutment: Sides of the valley on which the structure of the dam rest

Galleries: small rooms like structure left within the dam for checking

operations.

Diversion tunnel: Tunnels are constructed for diverting water before the

construction of dam. This helps in keeping the river bed dry.

Spillways: It is the arrangement near the top to release the excess water

of the reservoir to downstream side

Sluice way: An opening in the dam near the ground level, which is used to

clear the silt accumulation in the reservoir side.

TGravity Dams:

PES OF DAMS

These dams are heavy

and massive wall-like

structures of concrete in

which the whole weight

acts vertically

downwards

Reservoir

Force

As the entire load is transmitted on the small area of

foundation, such dams are constructed where rocks are

competent and stable.

Bhakra Dam is the

highest Concrete

Gravity dam in Asia

and Second Highest

in the world.

Bhakra Dam is across

river Sutlej in

Himachal Pradesh

The construction of

this project was

started in the year

1948 and was

completed in 1963 .

• It is 740 ft. high above the deepest foundation as straight concrete dam

being more than three times the height of Qutab Minar.

• Length at top 518.16 m (1700 feet); Width at base 190.5 m (625 feet),

and at the top is 9.14 m (30 feet)

Buttress Dam ress

Dam:

Buttress Dam – Is a gravity

dam reinforced by

structural supports

Buttress - a support that

transmits a force from a

roof or wall to another

supporting structure

This type of structure can be considered even if the

foundation rocks are little weaker

These type of dams are

concrete or masonry dams

which are curved or convex

upstream in plan

This shape helps to transmit the

major part of the water load to

the abutments

Arch dams are built across

narrow, deep river gorges, but

now in recent years they have

been considered even for little

wider valleys.

Arch dams ch

Dams:

TYPICAL NOF SECTION TYPICAL NOF SECTION

TYPICAL OVERFLOW SECTION

1. Solid Gravity dams :

This type of dam is the most rigid and requires

the least maintenance. It is adaptable to all

localities, but the height is governed by the

strength of the foundations. This type of dam

resists overturning moments of water pressure

by its weight alone.

2. Hollow Gravity Concrete Dam:

Hollow dams are constructed of reinforced

concrete

3. Buttress Dams:

These can be either Deck type with a RCC

Slab spanning between adjacent buttresses

or Multiple Arches supported on Butresses.  

4. Arch Concrete Dams:

These Dams are curved in plan and resist the

water pressure partly by their weight and

partly by arch action, spanning to abutments,

and thus transferring a part of water thrust

to the abutments

Explanation:

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