Chapter 11, Problem 11.5P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Organic soils are typically characterized by high void ratio, low specific gravity, and high compressibility. Following are the results of a consolidation test on a sample of organic soil obtained in southwest Florida.

Given are the initial height of the specimen = 0.7481 in, weight of dry specimen = 18 g, area of specimen = 4.91 in.^{2}, and *G _{s}* = 2.55.

**a.**Plot the*e*-log*σ′*curve.**b.**Determine the preconsolidation pressure.**c.**Calculate the compression index,*C*._{c}

(a)

To determine

Plot the

Explanation

**Given information:**

The initial height of the specimen

The weight of the dry specimen

The area of specimen

The specific gravity of soil solids

The pressure and change in dial readings are given in the table.

**Calculation:**

Consider the unit weight of water as

Calculate the final height of the specimen 1

Here,

Substitute *h* and

Calculate the final height of the specimen 2

Here,

Substitute *h* and

Similarly calculate the final height of the remaining specimens and tabulated as in Table 1.

Calculate the height of solids

Substitute *A*,

(b)

To determine

Calculate the preconsolidation pressure.

(c)

To determine

Calculate the compression index.

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