Consider the following statements in respect of dams: 1. In a gravity dam, a grout curtain is provided near the toe to reduce the exit gradient. 2. A drainage gallery with its drainage pipe system provided in a gravity dam reduces the uplift pressure at all levels below the upstream water level. 3. An earthquake acceleration of 0.1 g acting vertically downward causes a decrease of 10% in the limit weight of concrete and of water in a gravity dam. 4. The Tehri dam is a gravity dam. Which of the above statements are correct?

1 and 3 only
1 and 4 only
2 and 3 only
2 and 4 only

LohaHridoy

9 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : 1 and 3 only

Concept:

A drainage gallery with its drainage pipe system provided in a gravity dam reduces the uplift pressure built under it.

A grout curtain is a barrier that protects the foundation of a dam from seepage and can be made during initial construction or during repair. Additionally, they can be used to strengthen foundations and contain spills.

When a vertical acceleration is acting downward, the foundation shall try to move downward away from the dam body, thus reducing the effective weight and the stability of the dam. Vertical acceleration reduces the unit weight of the dam material.

An earthquake acceleration of 0.1 g acting vertically downward causes a decrease of 10% in the limit weight of concrete and of water in a gravity dam.

Tehri dam is a rock and earth fill embankment dam.

9 views Answered 2022-09-04 04:29

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