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"Classification of Tunnel" play a main role to clarify shapes, differences & accountability in design of Tunnel Structure                 Tunnel classification &Design of shape and size A tunnel classification may be for  foot or vehicular road traffic or for a canal. The central portion of rapid transit network are usually in the tunnel.Some tunnel are aqueduct to supply water for consumption or for hydroelectric station or sewers.  The shape of tunnel c/s is governed by nature and type of ground penetrated  while size is largely controlled by the use to which tunnel is put Theoretically  circular section is best for resisting either internal or  external  pressure and at the same time provides the greatest c/s area for least diameter Shapes for tunnel cross section Disadvantage But this circular section has  disadvantage  too .The top curved invert make it  difficult in carrying railway tracks without considerable filling of the invert. The curved bottom also ma