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Refer to Problem 13.8. If an additional requirement is that the factor of safety against uplift is at least 3 with the dead load on (live load = 0), what should be the diameter of the bell? Problem 13.8 Refer to Figure 13.25b. For the drilled shaft with bell, given: Thickness of active zone, Z = 9.15 m Dead load = 1334 kN Live load = 267 kN Diameter of the shaft,  = 1.07 m Zero swell pressure for the clay in the active zone = 574.6kN/m2 Average angle of plinth-soil friction Average undrained cohesion of the clay around the bell = 144.6kN/m2 Determine the diameter of the bell, . A factor of safety of 3 against uplift is required with the assumption that dead load plus live load is equal to zero Figure 13.25b

Refer to Problem 13.8. If an additional requirement is that the factor of safety against uplift is at least 3 with the dead load on (live load = 0), what should be the diameter of the bell? Problem 13.8 Refer to Figure 13.25b. For the drilled shaft with bell, given: Thickness of active zone, Z = 9.15 m Dead load = 1334 kN Live load = 267 kN Diameter of the shaft,  = 1.07 m Zero swell pressure for the clay in the active zone = 574.6kN/m2 Average angle of plinth-soil friction Average undrained cohesion of the clay around the bell = 144.6kN/m2 Determine the diameter of the bell, . A factor of safety of 3 against uplift is required with the assumption that dead load plus live load is equal to zero Figure 13.25b

Principles of Foundation Engineering (MindTap Course List)
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter13: Drilled-shaft Foundations
Section: Chapter Questions
Problem 13.6P
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Refer to Problem 13.8. If an additional requirement is that the factor of safety against uplift is at least 3 with the dead load on (live load = 0), what should be the diameter of the bell?

Problem 13.8

Refer to Figure 13.25b. For the drilled shaft with bell, given:

Thickness of active zone, Z = 9.15 m

Dead load = 1334 kN

Live load = 267 kN

Diameter of the shaft,  = 1.07 m

Zero swell pressure for the clay in the active zone = 574.6kN/m2

Average angle of plinth-soil friction

Average undrained cohesion of the clay around the bell = 144.6kN/m2

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

Figure 13.25b

 

 

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