subjected to an upward seepage head of 1.85 m What depth of coarse sand would be requirec above the existing soil to provide a factor of safety of 2 against piping? Assume that coarse sanc has the same porosity and specific gravity as the soil and that there is negligible head loss in sand

subjected to an upward seepage head of 1.85 m What depth of coarse sand would be requirec above the existing soil to provide a factor of safety of 2 against piping? Assume that coarse sanc has the same porosity and specific gravity as the soil and that there is negligible head loss in sand

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.10P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

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A 1.25 m layer of soil (n
subjected to an upward seepage head of 1.85 m.
What depth of coarse sand would be required
above the existing soil to provide a factor of safety
of 2 against piping? Assume that coarse sand
has the same porosity and specific gravity as the
soil and that there is negligible head loss in sand.
= 0.35, G = 2.65) is
%3D
%3D
Take
Yw
= 9.81 kN/m3.

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