Fundamental mechanism of reinforced earth can be

Fundamental
mechanisms of fiber reinforcement

 The basic mechanism of reinforced earth can be
explained in so many ways. A simple method of explaining the concept is by
Rankines’s method of stress theory. If a two dimensional element of cohesive
less soil subjected to uni-axial stress theory. It will not be able to remain
in equilibrium. The Mohr circle of stress will cut the strength envelope. If
the element is subjected to equal bi-axial stresses, it will undergo uniform
compression, if one of the stresses, say ?1 is increased while ?3 is kept constant
an expansion in the direction of stress ?3 will result. To hold the
element without failure, the lateral stresses must be increased. If
reinforcement is provided in the direction ?3, interaction
tensile stresses will be produced in the reinforcement and a corresponding
reinforcement. It will be analogous to the existence of a pair of planes which
prevent the Mohr circle to the right and away from the failure envelope and the
soil element will remain in equilibrium. The soil reinforcement friction is
fundamental to the concept of reinforced earth. Vidal (1978) describes
reinforced earth as a cohesive material. The cohesion is assumed to be induced
due to introduction of the reinforcement friction is produced in the direction
of reinforcement earth. It has however not been possible to define this
cohesion in a way as to enable its use in the design of reinforced earth
structures.

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studies indicate that stress–strain–strength
properties of randomly distributed fiber-reinforced soils are also a function
of fiber content, aspect ratio, and fiber-surface friction along with the soil
and fiber index and strength characteristics. A different view of the influence
of reinforcement on the behavior of soil mass has been advanced in the recent
past.

The reinforcement is assumed to restrict the dilatancy
of the soil leading to an increase in the mobilized shear strength. The
reinforcement also causes a rotation of principal strain directions relative to
the unreinforced case. The most effective directions for the reinforcement can
be estimated by the zero extension characteristics, which are thought to
represent potential slip or rupture surfaces.