A circular pile having a diameter of 0.45 m is 10 m long is embedded in a layer of loose sand with unit weight of 17.6 kN/cu.m. Water table exists at a depth 3 m from the ground surface. Saturated unit weight is 20.4 kN/cu.m. Lateral pressure coefficient = 1.15, bearing capacity factor = 79, friction angle = 34 degrees and FS = 3.0. Hint: tan(0)=u a. Compute the average effective pressure at critical depth. b. Determine the ultimate load capacity of the pile. c. If the pile is embedded on dense sand, determine the difference in the frictional capacity.

A circular pile having a diameter of 0.45 m is 10 m long is embedded in a layer of loose sand with unit weight of 17.6 kN/cu.m. Water table exists at a depth 3 m from the ground surface. Saturated unit weight is 20.4 kN/cu.m. Lateral pressure coefficient = 1.15, bearing capacity factor = 79, friction angle = 34 degrees and FS = 3.0. Hint: tan(0)=u a. Compute the average effective pressure at critical depth. b. Determine the ultimate load capacity of the pile. c. If the pile is embedded on dense sand, determine the difference in the frictional capacity.

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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Concept explainers

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

1. A circular pile having a diameter of 0.45 m is 10 m long is embedded in a layer of loose
sand with unit weight of 17.6 kN/cu.m. Water table exists at a depth 3 m from the ground
surface. Saturated unit weight is 20.4 kN/cu.m. Lateral pressure coefficient = 1.15, bearing
capacity factor = 79, friction angle = 34 degrees and FS = 3.0. Hint: tan(0)=u
a. Compute the average effective pressure at critical depth.
b. Determine the ultimate load capacity of the pile.
c. If the pile is embedded on dense sand, determine the difference in the frictional
capacity.

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