Abstract: The invention relates to a two-shell structural unit and system of attaching the units to form an outer layer in the construction of a steep embankment formed from several layers, this outer layer being suitable for greening. The structural unit is formed by a front element, a spacer element, and a rear-wall element. The front and rear-wall elements have a flexurally rigid lattice structure. The rear-wall element is a planar element that is either a flat element or has a shape defined by a polygonal curve. The spacer element has a stepped form on at least one side and has mounts for frictional joints with geosynthetics. Connector pieces permit positive and frictional joining of the elements of the unit. The structural unit is intended for use as an independent support system to continuously resist horizontal loads exerted by a backfilled embankment.

Abstract: The invention relates to a two-shell structural unit and system of attaching the units to form an outer layer in the construction of a steep embankment formed from several layers, this outer layer being suitable for greening. The structural unit is formed by a front element, a spacer element, and a rear-wall element. The front and rear-wall elements have a flexurally rigid lattice structure. The rear-wall element is a planar element that is either a flat element or has a shape defined by a polygonal curve. The spacer element has a stepped form on at least one side and has mounts for frictional joints with geosynthetics. Connector pieces permit positive and frictional joining of the elements of the unit. The structural unit is intended for use as an independent support system to continuously resist horizontal loads exerted by a backfilled embankment.