Repetitive loading along a channelized path causes unbound aggregate layers to densify, shake-down, and stabilize with little additional permanent or residual deformation per each wheel pass. Full-scalepavement tests conducted at the Federal Aviation Administration's National Airport Pavement Testing Facility(NAPTF) in the US indicated that a sequential aircraft wheel/gear wander pattern causes residual deformationsto be recovered in the unbound aggregate layers. The downward residual deformation caused by a pass of heavilyloaded landing gear is canceled by the upward residual deformation resulting from the pass of the same gear off-set by wander. This interaction indicates shuffling or rearrangement of the particles in the unbound layer, whichin turn reduces the strength of the layer causing future load applications to cause more residual deformation, the"anti-shakedown" effect. This paper analyzes the anti-shakedown effect of the contractive/dilative response ofthe unbound layers using multi-depth deflectometer data from NAPTF testing.
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