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GEO5

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Bustamante (SPT, Pressiometer PMT)

The analysis of bearing capacity of the micropile root section is based on the results of standard penetration tests (SPT) or pressiometric tests (PMT).

The magnitude of skin friction of the micropile root qs [MPa] is available from the graphs according to Bustamante, which depend on the type of soil and the injection technology.

Shaft resistance of the micropile root Rs follows from:

where:

dr

-

diameter of the micropile root

lr

-

length of the micropile root

qs

-

skin friction of the micropile root (value determined from the graph)

Base resistance of the micropile root Rb may not be considered in the analysis or is taken as:

where:

Rs

-

Shaft resistance of the micropile root

Base resistance of the micropile root Rb is assumed in the program in the form:

where:

Ap

-

croos-section area of the base of the micropile root

kp

-

soil factor in the vicinity of the base of the micropile root

pLM

-

limit pressure according to Menard