Refer to Figure 11.26b. For the drilled shaft with bell, given:Thickness of active zone, Z = 9 mDead load = 1500 kN Live load = 300 kNDiameter of the shaft, Ds = 1 mZero swell pressure for the clay in the active zone = 600 kN/m2Average 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. Dead load, DGrade beamGround surfaceUZActivezone, ZDrilled shaftswith bells- Dp(a)(b)Figure 11.26 (a) Construction of drilled shafts with bells and grade beam; (b) definition ofparameters in Eq. (11.14)

Shafts are the hollow pillars which are built inside the ground to support the construction over…

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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Refer to Figure 11.26b. 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, D_s = 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, D_b. A factor of safety of 3 against uplift is required with the assumption that dead load plus live load is equal to zero.

Dead load, D
Grade beam
Ground surface
U
Z
Active
zone, Z
Drilled shafts
with bells
- Dp
(a)
(b)
Figure 11.26 (a) Construction of drilled shafts with bells and grade beam; (b) definition of
parameters in Eq. (11.14)

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