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Zweck Theory

The Zweck and Bowles methods were developed for the analysis of anchor roots - they depend mainly on the geostatic stress in the location of the micropile root. These methods arise from the same priciples - the pressure magnitude is however reduced using the coefficient of pressure at rest Ko.

where:

d

-

root diameter

l

-

root length

Ko

-

magnitude of pressure at rest

σz

-

average geostatic stress at the micropile root

φ

-

average value of friction angle at the micropile root