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Salas Theory

The critical force Ncr for basic support conditions in the micropile head (determining micropile deflection) follows from:

where:

Ea*Ia

-

bending stiffness of micropile reinforcing tube

l

-

free length of micropile length

lef

-

length of fictitious fixed end

A

-

constat reflecting the type of support in micropile head

where:

f

-

coefficient depending on the ratio of modulus of elasticity of soil in micropile head and base

le

-

elastic length of micropile given by:

where:

Ea*Ia

-

bending stiffness of micropile reinforcing tube

El

-

modulus of elasticiy of soil in the micropile base

Literature:

Jiménez Salas J.A. a kol:Geotecnica y Cimientos III, Capitulo 3, Rueda, Madrid (Spanish).