What is the foundation of a dam?

What is the foundation of a dam?

A dam is built on a soil or rock foundation, depending on the type of dam. The foundation must be strong enough to carry the weight of the dam, and the water pressures acting on the dam. The dam foundation is below the original ground level.

Why foundation treatment is needed in gravity dam?

FOUNDATION TREATMENT OF THE GRAVITY DAMS. The foundation of the gravity dam should be hard, strong, durable and impervious. The imperviousness of the foundation is very important as uplift pressure depends greatly upon the seepage. Hence to render the foundation water proof or impervious, it has to be suitably treat.

Which dam requires strong foundation?

Gravity dams generally require stiff rock foundations of high bearing strength (slightly weathered to fresh), although in rare cases, they have been built on soil foundations.

Is code for stability of dam?

IS 7894: Code of practice for stability analysis of earth dams.

Which foundation is used in dam?

Concrete dams are constructed on rock foundations because of their enormous weight. Rock foundations have a very large load bearing capacity, resist erosion, and reduce permeability. A soil with a high permeability allows water to flow underneath the dam.

Which dam is best for weak foundation?

Buttress Dam Buttress dam is either straight or curved in plan. Greater the height of dam higher the number of buttresses. This type of dams are preferred where the foundation soil is very weak.

What are the disadvantages of gravity dam?

The following are the disadvantages of a gravity dam:

  • Their initial cost of construction is high.
  • Their construction period is comparatively more.
  • These require a strong and sound foundation.
  • Dams once constructed, cannot be raised further.
  • For the supervision of concrete dams, skilled labor is required.

Which dam is biggest of India?

Large Dam

# Name State
1 Tehri Dam Uttarakhand
2 Lakhwar Dam Uttarakhand
3 Idukki (Eb)/Idukki Arch Dam Kerala
4 Bhakra Dam Himachal Pradesh

Is water stopper a code?

HS Code used for Water stopper – Export

Hs Code Description No of Shipments
3926 Other Articles Of Plastics And Articles Of Other Materials Of Headings 3901 To 3914
39269099 Other 10
4016 Other Articles Of Vulcanised Rubber Other Than Hard Rubber
40169990 Other 2

What is the foundation treatment of Glen Canyon Dam?

FOUNDATION TREATMENT 12. GENERAL. The foundation treatment of Glen Canyon Dam consists of three parts: Grouting, drainage, and excavation of cutoff drifts and backfilling them with concrete. The cutoff drifts and the grouting will seal the cracks and joints.

Are there any gravity dams in India?

In fact, gravity dams are now being built of mass concrete, whose design and construction aspects would be discussed in this chapter. There are other dams built out of concrete like the Arch/Multiple Arch or Buttress type. These have however not been designed or constructed in India, except the sole one being the arch dam at Idukkion riverPeriyar.

When was the last masonry dam built in India?

Masonary dams have been in use in the past quite often but after independence, the last major masonry dam structure that was built was the Nagarjunsagar Dam on riverKrishna which was built during 1958-69. Normally, coursed rubble masonry was used which was bonded together by lime concrete or cement concrete.

What type of masonry is used to build dams?

Normally, coursed rubble masonry was used which was bonded together by lime concrete or cement concrete. However masonry dam is no longer being designed in our country probably due to existence of alternate easily available dam construction material and need construction technology.