Chapter 11, Problem 11.20P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

A 21-ft thick saturated clay layer (two-way drainage) subjected to surcharge loading underwent 87% primary consolidation in 300 days.

**a.**Find the coefficient of consolidation of the clay for the pressure range.**b.**How long will it take for a 0.75-in. thick specimen of the same undisturbed clay to undergo 75% consolidation in a laboratory test?

(a)

To determine

Calculate the coefficient of consolidation of the clay for the pressure range.

Explanation

**Given information:**

The primary consolidation

The thickness of the saturated clay layer

The time taken for

**Calculation:**

Calculate the time factor

Refer Table 11.7 “Variation of *U*” in the textbook.

Take the value of *U* of

Calculate the length of maximum drainage path

Substitute *H*.

Calculate the coefficient of consolidation

(b)

To determine

Calculate the time taken for

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