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Explain the following concepts related to pile foundations and use figures for illustration. 1) Define how a foundation is classified as shallow or deep, based on its width (B) and depth (D). 2) Describe the bearing mechanism of piles. 3) Explain about negative friction in pile foundations. 4) Draw the distribution of axial force on a pile where negative friction occurs. 5) Compare and contrast the relative advantages and disadvantages of steel pipe piles and precast concrete piles. 6) A pile with a diameter of 0.4 m and length of 30 m is driven into the soil ground. Find the ultimate bearing capacity of this pile considering the skin friction using Terzaghi's bearing capacity formula. Assume '=20°, c=10 kN/m², y=18 kN/m³ and f=40 kN/m². Static bearing capacity Terzaghi's bearing capacity formula taking peripheral friction into consideration is given by: Q = (a c⋅ Nc + y Dƒ N₁) · A₁ + πBfs Df where y: unit weight of soil around the pile Ap: cross-sectional area of the pile tip fs: skin friction c: cohesion of soil below the pile tip a: shape factor (for circular shape, α=1.3) D. depth of the pile B: diameter of the pile Equations for calculating ultimate bearing capacity from field tests Clayey ground (including skin friction): Q[kN] = 10cμлr² + 2 πr Dcμ where r: radius of the pile (m), cu: undrained shear strength (shear strength) (kN/m²), D: depth of the pile (m) Sandy ground (including skin friction): Q[kN] where N: N value for the soil at the pile tip Ap: cross-sectional area of the pile tip (m²) . = 400N A₂+2лÑ As (Meyerhof's equation) As: surface area of the pile upon which skin friction acts (m²) Ñ: average N value for the soils along the whole length of the pile

Explain the following concepts related to pile foundations and use figures for illustration. 1) Define how a foundation is classified as shallow or deep, based on its width (B) and depth (D). 2) Describe the bearing mechanism of piles. 3) Explain about negative friction in pile foundations. 4) Draw the distribution of axial force on a pile where negative friction occurs. 5) Compare and contrast the relative advantages and disadvantages of steel pipe piles and precast concrete piles. 6) A pile with a diameter of 0.4 m and length of 30 m is driven into the soil ground. Find the ultimate bearing capacity of this pile considering the skin friction using Terzaghi's bearing capacity formula. Assume '=20°, c=10 kN/m², y=18 kN/m³ and f=40 kN/m². Static bearing capacity Terzaghi's bearing capacity formula taking peripheral friction into consideration is given by: Q = (a c⋅ Nc + y Dƒ N₁) · A₁ + πBfs Df where y: unit weight of soil around the pile Ap: cross-sectional area of the pile tip fs: skin friction c: cohesion of soil below the pile tip a: shape factor (for circular shape, α=1.3) D. depth of the pile B: diameter of the pile Equations for calculating ultimate bearing capacity from field tests Clayey ground (including skin friction): Q[kN] = 10cμлr² + 2 πr Dcμ where r: radius of the pile (m), cu: undrained shear strength (shear strength) (kN/m²), D: depth of the pile (m) Sandy ground (including skin friction): Q[kN] where N: N value for the soil at the pile tip Ap: cross-sectional area of the pile tip (m²) . = 400N A₂+2лÑ As (Meyerhof's equation) As: surface area of the pile upon which skin friction acts (m²) Ñ: average N value for the soils along the whole length of the pile

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter18: Pile Foundation
Section: Chapter Questions
Problem 18.1P: State whether the following are true or false. a. Load carrying capacities of timber piles are less...
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Explain the following concepts related to pile foundations and use figures for illustration. 1) Define how a foundation is classified as shallow or deep, based on its width (B) and depth (D). 2) Describe the bearing mechanism of piles. 3) Explain about negative friction in pile foundations. 4) Draw the distribution of axial force on a pile where negative friction occurs. 5) Compare and contrast the relative advantages and disadvantages of steel pipe piles and precast concrete piles. 6) A pile with a diameter of 0.4 m and length of 30 m is driven into the soil ground. Find the ultimate bearing capacity of this pile considering the skin friction using Terzaghi's bearing capacity formula. Assume '=20°, c=10 kN/m², y=18 kN/m³ and f=40 kN/m². Static bearing capacity Terzaghi's bearing capacity formula taking peripheral friction into consideration is given by: Q = (a c⋅ Nc + y Dƒ N₁) · A₁ + πBfs Df where y: unit weight of soil around the pile Ap: cross-sectional area of the pile tip fs: skin friction c: cohesion of soil below the pile tip a: shape factor (for circular shape, α=1.3) D. depth of the pile B: diameter of the pile Equations for calculating ultimate bearing capacity from field tests Clayey ground (including skin friction): Q[kN] = 10cμлr² + 2 πr Dcμ where r: radius of the pile (m), cu: undrained shear strength (shear strength) (kN/m²), D: depth of the pile (m) Sandy ground (including skin friction): Q[kN] where N: N value for the soil at the pile tip Ap: cross-sectional area of the pile tip (m²) . = 400N A₂+2лÑ As (Meyerhof's equation) As: surface area of the pile upon which skin friction acts (m²) Ñ: average N value for the soils along the whole length of the pile
Transcribed Image Text:Explain the following concepts related to pile foundations and use figures for illustration. 1) Define how a foundation is classified as shallow or deep, based on its width (B) and depth (D). 2) Describe the bearing mechanism of piles. 3) Explain about negative friction in pile foundations. 4) Draw the distribution of axial force on a pile where negative friction occurs. 5) Compare and contrast the relative advantages and disadvantages of steel pipe piles and precast concrete piles. 6) A pile with a diameter of 0.4 m and length of 30 m is driven into the soil ground. Find the ultimate bearing capacity of this pile considering the skin friction using Terzaghi's bearing capacity formula. Assume '=20°, c=10 kN/m², y=18 kN/m³ and f=40 kN/m². Static bearing capacity Terzaghi's bearing capacity formula taking peripheral friction into consideration is given by: Q = (a c⋅ Nc + y Dƒ N₁) · A₁ + πBfs Df where y: unit weight of soil around the pile Ap: cross-sectional area of the pile tip fs: skin friction c: cohesion of soil below the pile tip a: shape factor (for circular shape, α=1.3) D. depth of the pile B: diameter of the pile Equations for calculating ultimate bearing capacity from field tests Clayey ground (including skin friction): Q[kN] = 10cμлr² + 2 πr Dcμ where r: radius of the pile (m), cu: undrained shear strength (shear strength) (kN/m²), D: depth of the pile (m) Sandy ground (including skin friction): Q[kN] where N: N value for the soil at the pile tip Ap: cross-sectional area of the pile tip (m²) . = 400N A₂+2лÑ As (Meyerhof's equation) As: surface area of the pile upon which skin friction acts (m²) Ñ: average N value for the soils along the whole length of the pile
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