STRUCTURAL-PROPERTIES OF PLANAR RANDOM HEAP OF HARD DISKS

We study here numerically the average angle of repose (theta(r)) and the packing fraction (rho(r)) of a random (two dimensional) heap of hard discs falling (under gravity) ballistically on a (sticky) base line, where the first layer of discs gets quenched in random positions. We find theta(r) is-approximately-equal-to 52-degrees and rho(r) is-approximately-equal-to 0.80 for such heaps. We also study the pressure or load distribution on the base line of such a random heap.