Consider the following statements concerning engineering geology: 1. Dams on sedimentary impervious strata dipping upstream will be unsafe. 2. In general, igneous rocks are hard and are suitable for construction of large hydraulic structures. 3. Construction of a major dam must be preceded by thorough geotechnical investigations. 4. Construction of dams is never indicated in any active zone of seismicity. Which of the above statements are correct?

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

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 3 : 2 and 3 only

Statement I- False

Beds with Steep upstream dip is not bad because for in this case, there shall be no uplift on the dam site and no leakage of water from the reservoir.

Statement II- True

Igneous rocks are formed from the solidification of molten rock material like Lave or Magma. Magma is molten rock that is underground and lava is molten rock that erupts out on the surface .

Examples : Granite, Andesite, Gabbros.

Characteristics of Igneous Rocks:

1. Contains no fossil.

2. Do not react with acid.

3. Single solid mass i.e. no layering due to which they are very hard.

4. Light or dark coloured.

Statement III- True

Construction of every structure like high rise buildings, dams, water tanks, railways etc. requires geotechnical investigation.

Statement IV False

Seismic activity depends on the mass on above the ground and below the ground. Dams have very huge mass and their construction on ground increase the land mass over earth’s surface. Due to this imbalance between lower of earth and above the earth’s surface, dam indicates active zone of seismicity.

4 views Answered 2022-09-04 04:29

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