A 5 m wide braced excavation is made in a saturated clay, as shown in Figure P19.1, with the following properties: c =20 kN/m², þ = 0, and y = 18.5 kN/m³. The struts are spaced at 5 m center to center in plan. a. Determine the strut forces. b. Determine the section modulus of the sheet pile required, assuming oall = 170 MN/m². c. Determine the maximum moment for the wales at levels B and C. 5 m

A 5 m wide braced excavation is made in a saturated clay, as shown in Figure P19.1, with the following properties: c =20 kN/m², þ = 0, and y = 18.5 kN/m³. The struts are spaced at 5 m center to center in plan. a. Determine the strut forces. b. Determine the section modulus of the sheet pile required, assuming oall = 170 MN/m². c. Determine the maximum moment for the wales at levels B and C. 5 m

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter19: Braced Cuts

Section: Chapter Questions

Problem 19.1P: A 5 m wide braced excavation is made in a saturated clay, as shown in Figure P19.1, with the...

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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

A 5 m wide braced excavation is made in a saturated clay, as shown
in Figure P19.1, with the following properties: c =20 kN/m?, 4= 0,
and y = 18.5 kN/m³. The struts are spaced at 5 m center to center in
plan.
a. Determine the strut forces.
b. Determine the section modulus of the sheet pile required,
assuming oall = 170 MN/m².
c. Determine the maximum moment for the wales at levels B
and C.
5 m
A
1 m
| 3 m
B
| 2 m
Im

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