ABSTRACT
This research considered the effect of an underground explosion on the fatigue life of a cement concrete runway and the supporting subgrade following the formation of a camouflet. For an unpressurized and empty camouflet void, the fatigue life of the runway increased or decreased depending upon the material property sets and depth of detonation. Pressurizing the void reduced runway surface displacements and for two material property sets, increased the subgrade fatigue life. For the unpressurized void, the minimum runaway surface displacements occurred for a filled camouflet void. In the apparently undisturbed subgrade outside the cone of disturbance, the fatigue life reduced for all material property sets.