Chapter 7, Problem 7.7P

### Principles of Geotechnical Enginee...

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

Chapter
Section

### Principles of Geotechnical Enginee...

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

# In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm2. If k = 2.1 × 10−2 cm/sec, and a rate of flow of 130 cm3/min has to be maintained during the test, what should be the head difference across the specimen?

To determine

Find the head difference across the specimen.

Explanation

Given information:

The length of the specimen L is 200 mm.

The cross sectional area of the specimen A is 78.5cm2.

The value of hydraulic conductivity k is 2.1×102cm/sec.

The rate of flow (Qt) is 130cm3/min.

Calculation:

Determine the hydraulic conductivity k using the relation.

k=QLAht

Substitute 2.1×102cm/sec for k, 130cm3/min for (Qt), 200 mm for L, and 78

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