Answered: Find effective stress at A and…

Find effective stress at A and determine the stability of cut under given condition. (ii) What should be water level into the pond to ensure factor of safety = 1.5. (Given that yw = 9.81

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter6: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 6.7P: Use Eq. (6.14) to determine the stress increase () at z = 10 ft below the center of the area...

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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: You have been assigned to check the stability of a pond constructed in stiff saturated clay
underlain by a layer of sand. The necessary information are given in the following figure. (i)
Find effective stress at A and determine the stability of cut under given condition. (ii) What
should be water level into the pond to ensure factor of safety = 1.5. (Given that yw = 9.81
kN/m³)
H = 5 m
7m
2m
2m
J
Saturated clay
Sand
Ysat = 16 kN/m³
4m
Ysat = 15 kN/m³

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Step 2: Part i) effective stress at A and Stability of cut under given conditions

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Step 3: Part ii) water level into pond to insure stability fos= 1.5

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