  We report numerical results of effective attractive forces on the packing
properties of two-dimensional elongated grains. In deposits of non-cohesive
rods in 2D, the topology of the packing is mainly dominated by the formation of
ordered structures of aligned rods. Elongated particles tend to align
horizontally and the stress is mainly transmitted from top to bottom, revealing
an asymmetric distribution of local stress. However, for deposits of cohesive
particles, the preferred horizontal orientation disappears. Very elongated
particles with strong attractive forces form extremely loose structures,
characterized by an orientation distribution, which tends to a uniform behavior
when increasing the Bond number. As a result of these changes, the pressure
distribution in the deposits changes qualitatively. The isotropic part of the
local stress is notably enhanced with respect to the deviatoric part, which is
related to the gravity direction. Consequently, the lateral stress transmission
is dominated by the enhanced disorder and leads to a faster pressure saturation
with depth.
