Q=400KN Ground Level 38° #16KN.m3 K=0.90 5m Dense Sand tan-0.45 N-80 Saturated Sand 38° 4m Ter=18.5kN.m 39° c=150KN.m2 -20.2kN.m Bed Rock Not to scale (a) Design a pile foundation. (b) Design a shallow square foundation (c) Compare the two foundations designed in (a) and (b).

Q=400KN Ground Level 38° #16KN.m3 K=0.90 5m Dense Sand tan-0.45 N-80 Saturated Sand 38° 4m Ter=18.5kN.m 39° c=150KN.m2 -20.2kN.m Bed Rock Not to scale (a) Design a pile foundation. (b) Design a shallow square foundation (c) Compare the two foundations designed in (a) and (b).

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter17: Settlement Of Shallow Foundations

Section: Chapter Questions

Problem 17.12P

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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

Q=400KN
Ground Level
38°
#16KN.m3
K=0.90
tan-0.45
N=80
5m
Dense Sand
38°
Tar=18.5kN.m3
4m
Saturated Sand
39°
c=150kN.m2
-20.2kN.m
Bed Rock
Not to scale
(a) Design a pile foundation.
(b) Design a shallow square foundation.
(c) Compare the two foundations designed in (a) and (b).

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