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where:

R_bk

-

bearing capacity of the micropile root

R_sk

-

skin bearing capacity of the micropile root

where:

n

-

number of layers passed by the micropile root

A_si

-

area of the wall of the micropile base in the i^th layer

q_si

-

skin friction in the i^th layer

where:

z

-

depth z below 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 interface 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

σ_h(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:

K_o

-

coefficient of earth pressure at rest

-

for normally consolidated soils:

-

for overconsolidated soils:

σ_v(z)

-

vertical component of geostatic stress at a depth of z

p_i

-

grouting pressure for grouting course of type IR and IRS and depth

z ≥ 5 m, in other cases p_i = 0

F_c, F_φ

-

coefficients of type of application of micropile