Refer to Figure 15.26b. For the drilled shaft with bell, given: Thickness of active zone, Z =

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Refer to Figure 15.26b. For the drilled shaft with bell, given:

Thickness of active zone, Z = 9 m

Dead load = 1500 kN

Live load = 300 kN

Diameter of the shaft, Ds = 1 m

Zero swell pressure for the clay in the active zone = 600 kN/m2

Average angle of plinth–soil friction, ϕ'ps = 20°

Average undrained cohesion of the clay around the bell = 150 kN/m2

Determine the diameter of the bell, Db. A factor of safety of 3 against uplift is required with the assumption that dead load plus live load is equal to zero.


Figure 15.26

Dead load, D Grade beam Ground surface +D,> U Active zone, Z Drilled shafts with bells (a) (b)

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Principles Of Foundation Engineering

ISBN: 9781337705028

9th Edition

Authors: Braja M. Das, Nagaratnam Sivakugan

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