This architectural plan is Shape of tunnel with dimensions. Horseshoe tunnel. A tunnel of roughly horseshoe-shaped cross section, oriented like an inverted "U". Many variations on the basic configuration are possible. Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous. 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 their arch shape. For more details and information download the drawing file.
