  We consider the rearrangements of a vertical twodimensional granular packing
induced by the withdrawal of an intruder. Here, we focus on the influence of
the size of the intruder on the reorganization process. The long term evolution
of the granular packing is investigated as well as the avalanche dynamics that
characterize the short term rearrangements around the intruder. For small
enough intruder, we observe the formation of arches that periodically
destabilize and influence the reorganization dynamics of the two-dimensional
packing through larger rearrangement events.
