Shapes of Tunnels Commonly used tunnel shapes(Shapes of Tunnels) are discussed below: PolycentricCircularRectangularEgg-shapedHorseshoe typeEllipticalSegmental 1. Polycentric Shaped of Tunnels This sort of tunnel shape has a number of centers and provides a sufficient flat base for traffic movement. Advantages: It can be used for road and railway traffic.It can resist external and internal pressure for … Continue reading 7 Shapes of Tunnels →

20 Types of Classification of Tunnels Tunnels are generally classified on the basis of the purpose, types of material and according to their position:   A. Classification Based on The Purpose Base on purpose tunnels are classified as: a. Traffic Tunnels Traffic tunnels are of following types: Highway tunnelsRailway tunnelsNavigation TunnelsPedestrian tunnelsSubway tunnels b. Conveyance … Continue reading 20 Types of Classification of Tunnels →

Necessity of Tunnels The necessity of tunnels are as follows:   1. Tunnels are necessary, to avoid the long road and railway track construction along the surface of the hill to reach out the other side of the hill. 2. Tunnels are constructed for connecting the two terminal stations, which separated by a mountain. 3. To avoid … Continue reading 8 Necessity of Tunnels →