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Rigid Shaft Structure

Shaft supported using secant pile walls is a typical example of the shaft with rigid construction. In the first construction stage the own shaft construction is built and therefore the soil is excavated. The load on the shaft due to earth pressure is equal to the at rest earth pressure because the rigid construction has minimal deformations. This construction behavior is well described by Y. M. and Y. Y. Hu theory (2005).

Load on rigid 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

ratio of the depth of cut h to the radius of the shaft r0

Literature:

Cheng, Y. M.; Hu, Y. Y.: Active earth pressure on circular shaft lining obtained by simplified slip line solution with general tangential stress coefficient. Chinese Journal of Geotechnical Engineering, 27 (1), 110-115, 2005.