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Micropile 

GEO5

Geotechnical software

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Véas theory

This solution takes into account the effect of geostatic stress at the micropile root and course of grouting. 

Bearing capacity of the micropile root is provided by:

where: Rbk - bearing capacity of the micropile root
Rsk - skin bearing capacity of the micropile root

Micropile skin bearing capacity:

where: n - number of layers passed by the micropile root
Asi - area of wall of the micropile base in the i-th layer
qsi - skin friction in the i-th layer

Bearing capacity of the micropile root is provided by:

Skin friction  qs at a depth of z below the terrain surface:

where: z - depth z bellow the terrain surface, where the magnitude of skin friction is determined
c - effective cohesion of soil at a depth of z
δ - friction angle along the interfave of the micropile root and the soil at a depth of z:
φ´ - effective angle of internal friction of soil at a depth of z
σh(z) - horizontal component of geostatic stress at a depth of z:
- for grouting course of type IR and IRS (with monitoring of grouting pressure) and depth z ≥ 5 m:
- other cases:
Ko - coefficient of earth pressure at rest
- for normally consolidated soils:
- for overconsolidated soils:
σv(z) - vertical component of geostatic stress at a depth of z
pi - grouting pressure for grouting course of type IR and IRS and depth
z ≥ 5 m, in other cases pi = 0
Fc, Fφ - coefficients of type of application of micropile

Literature:

Véase, Souche: Étude du fla,berment de pieux partiellernent immergés dans offrant latéralement une réaction élastique pure, Annales de I’ITBTP, No. 423, Sene Soils et Foundations, 187, mars – avril 1984, str. 38 – 60 (French)

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