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Bearing Capacity of the Root in Rock

This solution is suitable for the mircopile root reaching into rocks with index RQD > 60 or having the strength in simple compression σc  > 20 MPa (ISRM < III). The root bearing capacity is given by:

where:

As

-

area of wall of micropile root

qsr

-

skin friction in rock

Ab

-

area of the micropile root

qbr

-

bearing capacity of the microple root in rock

Literature:

Guía para el proyecto y la ejecución de micropilotes en obras de carretera, Ministerio de fomento, 2005 (Spanish).