Following is the variation of N60 with depth in a granular soil deposit. A concrete pile 9 m long (460 mm x 460 mm in cross section) is driven into the sand and fully embedded in the sand. Estimate the allowable load-carrying capacity of the pile (Qall). Use FS as 4 and Meyerhof’s equations 9.5 Following is the variation of Ngo with depth in a granular soil deposit. A concretepile 9 m long (460 mm × 460 mm in cross section) is driven into the sand and fullyembedded in the sand.Depth (m)Ngo1.543.074.596.0107.5169.02010.52111.02312.52014.021 Y = 15.7 kN/mo' = 32°3 mc' = 0Groundwater"fableYat = 18.2 kN/m6' = 32°c' = 03 m= 19.2 kN/mYsatd' = 40°15 mc' = 0381 mmFigure P9.4Estimate the allowable load-carrying capacity of the pile (Qai). Use FS = 4 andMeyerhof's equations [Eqs. (9.37) and (9.45)].9p = 0.4p,N60< 4p N60(9.37)Meyerhof (1976) indicated that the average unit frictional resistance, fav, forhigh-displacement driven piles may be obtained from average standard penetrationresistance values asfav = 0.02p.(No)(9.45)where(N6o) = average value of standard penetration resistancePa = atmospheric pressure (100 kN/m² or 2000 lb/ft)

Pile length (L) = 9 mPile cross section = 0.46 m × 0.46 mCross-sectional Area of pile = 0.46 × 0.46…

Answered: Following is the variation of N60 with…

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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Following is the variation of N60 with depth in a granular soil deposit. A concrete pile 9 m long (460 mm x 460 mm in cross section) is driven into the sand and fully embedded in the sand.

Estimate the allowable load-carrying capacity of the pile (Qall). Use FS as 4 and Meyerhof’s equations

9.5 Following is the variation of Ngo with depth in a granular soil deposit. A concrete
pile 9 m long (460 mm × 460 mm in cross section) is driven into the sand and fully
embedded in the sand.
Depth (m)
Ngo
1.5
4
3.0
7
4.5
9
6.0
10
7.5
16
9.0
20
10.5
21
11.0
23
12.5
20
14.0
21

Y = 15.7 kN/m
o' = 32°
3 m
c' = 0
Groundwater
"fable
Yat = 18.2 kN/m
6' = 32°
c' = 0
3 m
= 19.2 kN/m
Ysat
d' = 40°
15 m
c' = 0
381 mm
Figure P9.4
Estimate the allowable load-carrying capacity of the pile (Qai). Use FS = 4 and
Meyerhof's equations [Eqs. (9.37) and (9.45)].
9p = 0.4p,N60
< 4p N60
(9.37)
Meyerhof (1976) indicated that the average unit frictional resistance, fav, for
high-displacement driven piles may be obtained from average standard penetration
resistance values as
fav = 0.02p.(No)
(9.45)
where
(N6o) = average value of standard penetration resistance
Pa = atmospheric pressure (100 kN/m² or 2000 lb/ft)

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