Refer to Problem 15.8. If an additional requirement is that the factor of safety against uplift is
Question:
Refer to Problem 15.8. If an additional requirement is that the factor of safety against uplift is at least 4 with the dead load on (live load = 0), what should be the diameter of the bell?
Problem 15.8.
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
Step by Step Answer:
Principles Of Foundation Engineering
ISBN: 9781337705028
9th Edition
Authors: Braja M. Das, Nagaratnam Sivakugan