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 reinforcement |
l | - | free length of micropile length | |
lef | - | length of the fictitious fixed end | |
A | - |
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 reinforcement |
El | - | modulus of elasticity of soil in the micropile base |
Literature:
Jiménez Salas J.A. a kol:Geotecnica y Cimientos III, Capitulo 3, Rueda, Madrid (Spanish).