A soft normally consolidated clay layer is 20 mthick with a moisture content of 45%. The clayhas a saturated unit weight of 20 kN/m³, aparticle specific gravity of 2.7 and a liquid limitof 60%. A foundation load will subjected thecentre of the layer to a vertical stress increaseof 10 kPa. Ground water level is at the surfaceof the clay. Estimate(a) The initial and final effective stresses at thecentre of the layer(b) The approximate value of the compressionindex (c2)(c) The consolidation settlement of thefoundation if the initial effective stress at thecenter of the soil is 100kPa.Assume unit weight a water to be 10 kN/m³.

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Answered: A soft normally consolidated clay layer…

Engineering

Civil Engineering

A soft normally consolidated clay layer is 20 m

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.14P

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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 soft normally consolidated clay layer is 20 m
thick with a moisture content of 45%. The clay
has a saturated unit weight of 20 kN/m³, a
particle specific gravity of 2.7 and a liquid limit
of 60%. A foundation load will subjected the
centre of the layer to a vertical stress increase
of 10 kPa. Ground water level is at the surface
of the clay. Estimate
(a) The initial and final effective stresses at the
centre of the layer
(b) The approximate value of the compression
index (c2)
(c) The consolidation settlement of the
foundation if the initial effective stress at the
center of the soil is 100kPa.
Assume unit weight a water to be 10 kN/m³.

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