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(b) A single test pile, 300 mm diameter, is driven through a depth of 8 m of clay which has an undrained cohesive strength varying from 10 kPa at its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of the pile, for an overall factor of safety 3.0. Assume a = 0.65 and N. 9.0. (Answer 60 kN).

(b) A single test pile, 300 mm diameter, is driven through a depth of 8 m of clay which has an undrained cohesive strength varying from 10 kPa at its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of the pile, for an overall factor of safety 3.0. Assume a = 0.65 and N. 9.0. (Answer 60 kN).

Structural Analysis
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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QUESTION 1 (a) Determine the allowable load-carrying capacity of the bored concrete pile for: embedded length = 8 m, and embedded length = 11 m. Take the diameter of the pile as 0.5m. (Answer Qal = 357 kN @8m and 573 kN @11m for FS = 3). Q. Qal FS %3D The factor of safety generally used ranges from 2.5 to 4, depending on the uncertainties surrounding the calculation of ultimate load. Depth (m) y = 20 kN/m3 Q' = 30° Ks = 1.0 Loose granular fill Y = 21 kN/m3 p' = 35° Ks = 2.0 Dense gravel 7 y = 20 kN/m3 cu at 7.0 m = 120 kPa cu at 8.0 m = 145 kPa 8 Glacial clay ! cu at 11.0 m = 220 kPa, adhesion factor, a = 0.6, Nc = 9 11 (b) A single test pile, 300 mm diameter, is driven through a depth of 8 m of clay which has an undrained cohesive strength varying from 10 kPa at its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of the pile, for an overall factor of safety = 3.0. Assume a 0.65 and N, = 9.0. (Answer 60 kN).
Transcribed Image Text:QUESTION 1 (a) Determine the allowable load-carrying capacity of the bored concrete pile for: embedded length = 8 m, and embedded length = 11 m. Take the diameter of the pile as 0.5m. (Answer Qal = 357 kN @8m and 573 kN @11m for FS = 3). Q. Qal FS %3D The factor of safety generally used ranges from 2.5 to 4, depending on the uncertainties surrounding the calculation of ultimate load. Depth (m) y = 20 kN/m3 Q' = 30° Ks = 1.0 Loose granular fill Y = 21 kN/m3 p' = 35° Ks = 2.0 Dense gravel 7 y = 20 kN/m3 cu at 7.0 m = 120 kPa cu at 8.0 m = 145 kPa 8 Glacial clay ! cu at 11.0 m = 220 kPa, adhesion factor, a = 0.6, Nc = 9 11 (b) A single test pile, 300 mm diameter, is driven through a depth of 8 m of clay which has an undrained cohesive strength varying from 10 kPa at its surface to 50 kPa at a depth of 8 m. Estimate the safe load capacity of the pile, for an overall factor of safety = 3.0. Assume a 0.65 and N, = 9.0. (Answer 60 kN).
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