Chapter 7, Problem 7.8P

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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 mm^{2}

• 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?

(a)

To determine

Find the hydraulic conductivity of the soil.

Explanation

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

The constant head difference

The constant head difference

Calculation:

Determine the area of the specimen *A* using the relation.

Substitute 70 mm for *d*.

Determine the hydraulic conductivity *k* using the relation.

Substitute *a*, 140 mm for *L*,

(b)

To determine

Find the head difference at 5 min time duration.

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