Rutting occurs in mine roads due to the increasingly accumulative, repetitive plastic deformation of the moist soil under the truck tyres. Limit equilibrium method can be used to find an upper bound solution to the first plastic deformation. The simplest analogous problem to road rutting would be the mobilised bearing capacity (qu) of a strip footing (tyre of width B) on an undrained clay of cohesion Cu, given by the soil shear strength = qu = CN.Cu = 2.Cu