Variation of N60 with depth in a granular soil deposit is given below. A concrete pile 9 m long with cross-section of 0.305m X 0.305m is driven into the sand. Then, estimate the allowable load-carrying capacity of the pile (Qallow). Use F.S.=4 and Meyerhof's equation for Qp and Qs. Depth (m) N60 1.5 4 3.0 4.5 7 6.0 5 7.5 16 9.0 18 10.5 11.0 21 24 12.5 20 14.0 19 + Co

Variation of N60 with depth in a granular soil deposit is given below. A concrete pile 9 m long with cross-section of 0.305m X 0.305m is driven into the sand. Then, estimate the allowable load-carrying capacity of the pile (Qallow). Use F.S.=4 and Meyerhof's equation for Qp and Qs. Depth (m) N60 1.5 4 3.0 4.5 7 6.0 5 7.5 16 9.0 18 10.5 11.0 21 24 12.5 20 14.0 19 + Co

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter9: Pile Foundations

Section: Chapter Questions

Problem 9.6P

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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

Variation of N60 with depth in a granular soil deposit is given below. A concrete pile 9 m long
with cross-section of 0.305m X 0.305m is driven into the sand. Then, estimate the allowable
load-carrying capacity of the pile (Qallow). Use F.S.=4 and Meyerhof's equation for Qp and
Qs.
Depth (m)
N60
1.5
4
3.0
4.5
7
6.0
7.5
16
9.0
18
10.5
21
11.0
24
12.5
20
14.0
19

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