Figure 4 Deformation contours for 0.55m lining thickness of tunnel and 5m depth of overburden for (a) 10kg, (b) 20kg, (c) 30kg, (d) 40kg, (e) 50kg and (f) 60kg of TNT explosive Figure 4 Deformation contours for 0.55m lining thickness of tunnel and 5m depth of overburden for (a) 10kg, (b) 20kg, (c) 30kg, (d) 40kg, (e) 50kg and (f) 60kg of TNT explosive