The comparative response of the thickness of tunnel lining when subjected to a constant (60kg of TNT) blast load has been plotted in Figure 2. The deformation decreases as the depth of overburden increases from 5m to 7.5m @ 70%-73% and for increase in depth of overburden from 7.5m to 10m and from 10m of overburden depth to 12.5m, the decrease in deformation has been observed as 23%-28%. Hence, it may be noted that deep tunnels are more blast resistant in comparison to the shallow tunnels. Moreover, for the increase in the tunnel lining thickness initially from 0.22m to 0.35m a significant decrease in deformation has been observed, i.e., 20% decrease in deformation. However, relatively smaller increase in resistance to deformation has been noted for the increase in the tunnel lining thickness from 0.35m to 0.55m. Hence, it may be concluded that an optimum tunnel lining thickness should be taken into account for less damage due to blast loading.