Design a support system with the struts are located at 3.5 m center to center in the plan. Given: y = 17 kN/m³, ø' = 38°, and c' = 0. -4.5 m: A Sand y = 16 kN/m³ $'= 38° c'= 0 2.5 m B 3 m 1.5 m a) Draw the earth-pressure envelope and determine the strut loads at levels A, B, and C.

Design a support system with the struts are located at 3.5 m center to center in the plan. Given: y = 17 kN/m³, ø' = 38°, and c' = 0. -4.5 m: A Sand y = 16 kN/m³ $'= 38° c'= 0 2.5 m B 3 m 1.5 m a) Draw the earth-pressure envelope and determine the strut loads at levels A, B, and C.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter15: Retaining Walls, Braced Cuts, And Sheet Pile Walls

Section: Chapter Questions

Problem 15.21P: Determine the factor of safety against bottom heave for the braced cut described in Problem 15.18....

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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

Design a support system with the struts are located at 3.5 m center to center in the
plan. Given: y = 17 kN/m³, ø' = 38°, and c' = 0.
-4.5 m:
1 m
A
Sand
y = 16 kN/m³
d'= 38°
c'= 0
2.5 m
В
3 m
1.5 m
a) Draw the earth-pressure envelope and determine the strut loads at levels A, B,
and C.
b) Determine the following:
i.
The sheet-pile section modulus
ii.
The section modulus of the wales at level B
Oall = 170 MN/m?

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