Which shape of tunnel is suitable for the purpose of navigation?

Question

1 Answer

answered Feb 21, 2022 by BabulPandey (106k points)
selected Feb 21, 2022 by Nausheenk

Best answer

Correct Answer - Option 2 : D shape

Explanation:

Types of tunnels and their functions:

Name(Shape)	Function
Segmental/D shaped	Suitable for heavy traffic loads and bear the external load by arch action Most suited for rock tunnels
Polycentric	Used for road and railway traffic Resist external/internal pressure by arch action Construction is difficult
Circular	Used to carry water under pressure Not used for traffic load, as more filling is needed to make the base flat Provides the greatest cross-section for least perimeter
Rectangular	Not suitable to carry external pressure due to its shape, so not used nowadays.
Egg	This tunnel shape has many centers and radius lengths. These are suitable as sewer tunnels to carry sewage water.
Horseshoe	Horseshoe type tunnel shape is a combined shape of arches and circular tunnel. This type of tunnel shape is quite popular.
Elliptical	For carrying water, elliptical-shaped tunnels are appropriate. These are suitable for softer material.