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Flexible Shaft Structure

Conventional excavation method is a typical example of using the shaft with flexible construction. Using this method, the rock is excavated in the first step and afterwards concrete is sprayed on to hardened surface to support the rock. There are specific technological downtime (ground excavation, shotcrete or arch timbering) with enabling stress rearrangement in the surrounding soil and the consequent value of the earth pressure acting on the shaft will be equal to the active earth pressure. This fact is well described by V.G. Berezantsev's method (1958).

Load on flexible shaft is defined using this formula:

where:

γ

-

unit weight of soil

h

-

depth of cross-section

q

-

magnitude of a surcharge

cef

-

shear strength of soil

where:

r0

-

radius of shaft

φef

-

angle of internal friction of soil

ξ = 1

λ = 1

Literature:

Berezantzev, V. G.: Earth pressure on the cylindrical retaining walls, Brussels conference on Earth pressure problems, 1958.