Chapter 9, Problem 9.12P

### 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

# Refer to Figure 9.4a. If H1 = 3 ft, H2 = 4.5 ft, h = 1.5 ft, γsat = 119 lb/ft3, area of the tank = 6.2 ft2, and hydraulic conductivity of the sand (k) = 0.31 ft/min,a. What is the rate of upward seepage of water (ft3/min)?b. If the point C is located at the middle of the soil layer, then what is the effective stress at C?

(a)

To determine

Find the rate of upward seepage of water.

Explanation

Given information:

The depth of point A is H1 is 3 ft.

The depth between point A and B is H2 is 4.5 ft.

The depth (h) is 1.5 ft.

The area (A) of the tank is 6.2ft2.

The saturated unit weight of sand (γsat) is 119lb/ft3.

The hydraulic conductivity (k) of the soil is 0.31 ft/min.

Calculation:

Determine the hydraulic gradient i using the relation.

i=hH2

Substitute 1.5 ft for h and 4.5 ft for H2.

i=1

(b)

To determine

Find the effective stress σc at point C if the point C is located at the middle of the soil layer.

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