Principles of Geotechnical Enginee...

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



Principles of Geotechnical Enginee...

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

The following data are for a falling-head permeability test:

• Length of the soil sample = 140 mm

• Diameter of soil sample = 70 mm

• Area of the standpipe = 19.6 mm2

• At time t = 0, head difference = 500 mm

• At time t = 7 min, head difference = 350 mm

a. Determine the hydraulic conductivity of the soil (cm/sec)

b. What was the head difference at t = 5 min?


To determine

Find the hydraulic conductivity of the soil.


Given information:

The diameter of the soil sample d is 70 mm.

The length of the soil sample L is 140 mm.

The area of standpipe a is 19.6mm2.

The constant head difference (h1) at t=0 is 500 mm.

The constant head difference (h2) at t=7min is 350 mm.


Determine the area of the specimen A using the relation.


Substitute 70 mm for d.


Determine the hydraulic conductivity k using the relation.


Substitute 19.6mm2 for a, 140 mm for L, 3,848


To determine

Find the head difference at 5 min time duration.

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