  The large scale matter distribution in three different simulations of CDM
models is investigated and compared with corresponding results of the
Zel'dovich theory of nonlinear gravitational instability. We show that the
basic characteristics of wall-like structure elements are well described by
this theory, and that they can be expressed by the cosmological parameters and
a few spectral moments of the perturbation spectrum. Therefore the
characteristics of such elements provide reasonable estimates of these
parameters. We show that the compressed matter is relaxed and gravitationally
confined, what manifests itself in the existence of walls as (quasi)stationary
structure elements with life time restricted by their disruption into high
density clouds.
  The matter distribution is investigated both in the real and redshift spaces.
In both cases almost the same particles form the walls, and we estimate
differences in corresponding wall characteristics. The same methods are applied
to several mock catalogues of 'galaxies' what allows us to characterize a large
scale bias between the spatial distribution of dark matter and of simulated
`galaxies'.
