A 1.5 m layer of soil is subjected to an upward seepage head of 1.68 m. The depth of coarse sand required above this soil to provide a factor of 1.5 against piping will be (Coarse sand and soil have specific gravity 2.67 and porosity as 40%).

A 1.5 m layer of soil is subjected to an upward seepage head of 1.68 m. The depth of coarse sand required above this soil to provide a factor of 1.5 against piping will be (Coarse sand and soil have specific gravity 2.67 and porosity as 40%).

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.6P

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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

A 1.5 m layer of soil is subjected to an upward seepage head of 1.68 m. The depth of coarse sand required
above this soil to provide a factor of 1.5 against piping will be
(Coarse sand and soil have specific gravity 2.67 and porosity as 40%).

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