Soil Reinforcement is a special and recent field of soil improvement. It covers a range of techniques which consist of placing resisting inclusions in the soil. Depending on the type of the inclusion two extreme cases can be considered: a 'uniform inclusion' where the soil-reinforcement interaction can develop in any point along the inclusion; a 'composite inclusion' which consists of an inclusion reinforced in some particular points where the soil-reinforcement interaction is concentrated. In the case of a 'uniform inclusion' a relatively high and uniform density of the reinforcements will result in a new composite material called the 'Reinforced Soil'. The behavior of the 'reinforced soil' mass can be investigated considering a representative sample of the new composite material. Refs.