Chapter 9, Problem 9.12P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Refer to Figure 9.4a. If *H*_{1} = 3 ft, *H*_{2} = 4.5 ft, *h* = 1.5 ft, *γ*_{sat} = 119 lb/ft^{3}, area of the tank = 6.2 ft^{2}, and hydraulic conductivity of the sand (*k*) = 0.31 ft/min,

**a.** What is the rate of upward seepage of water (ft^{3}/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

The depth between point *A* and *B* is

The depth (*h*) is 1.5 ft.

The area (*A*) of the tank is

The saturated unit weight of sand

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

Calculation:

Determine the hydraulic gradient *i* using the relation.

Substitute 1.5 ft for *h* and 4.5 ft for

(b)

To determine

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

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