   Chapter 4, Problem 4.1CTP Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

Solutions

Chapter
Section Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

The properties of seven different clayey soils are shown below (Skempton and Northey, 1952). Investigate the relationship between the strength and plasticity characteristics by performing the following tasks:a. Estimate the plasticity index for each soil using Skempton’s definition of activity [Eq. (4.28)].b. Estimate the probable mineral composition of the clay soils based on PI and A (use Table 4.3)c. Sensitivity (St) refers to the loss of strength when the soil is remolded or disturbed. It is defined as the ratio of the undisturbed strength (τf-undisturbed) to the remolded strength (τf-remolded)) at the same moisture content [Eq. (12.49)]. From the given data, estimate τf-remolded for the clay soils.d. Plot the variations of undisturbed and remolded shear strengths with the activity, A, and explain the observed behavior. (a)

To determine

Find the plasticity index for each soil using Skempton’s definition of activity.

Explanation

Determine the plasticity index of the Beauharnais soil using the relation.

A=PI%ofclay-sizefraction, byweight

Here, A is an activity.

Substitute 0.52 for A and 79 for % of clay–size fraction, by weight.

0.52=PI790.52×79=PIPI=41.08

Similarly, calculate the plasticity index for the remaining soils.

Determine the remolded shear strength of the Beauharnais soil using the relation.

τfremolded=τfundisturbedSt

Here, τfundisturbed is the undisturbed shear strength and St is the sensitivity

(b)

To determine

Find the probable mineral composition of the clay soils based on PI and A.

(c)

To determine

Find the remoulded shear strength of the clay soil.

(d)

To determine

Plot the variations of undisturbed and remolded shear strengths with the activity A.

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