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We experimentally study the statistics of force-chain evolution in avertically-tapped two-dimensional granular packing by using photoelastic disks.In this experiment, the tapped granular packing is gradually compacted. Duringthe compaction, the isotropy of grain configurations is quantified by measuringthe deviator anisotropy derived from fabric tensor, and then the evolution offorce-chain structure is quantified by measuring the interparticle forces andforce-chain orientational order parameter. As packing fraction increases, theinterparticle force increases and finally saturates to an asymptotic value.Moreover, the grain configurations and force-chain structures becomeisotropically random as the tapping-induced compaction proceeds. In contrast,the total length of force chains remains unchanged. From the correlations ofthose parameters, we find two relations: (i) a positive correlation between theisotropy of grain configurations and the disordering of force-chainorientations, and (ii) a negative correlation between the increasing ofinterparticle forces and the disordering of force-chain orientations. Theserelations are universally held regardless of the mode of particle motionswith/without convection.

Force Chain Evolution in a Two-Dimensional Granular Packing Compacted by Vertical Tappings