Chapter 8, Problem 8.1P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Refer to Figure 8.23. Given:

- •
*H*_{1}= 6m - •
*H*_{2}*=*1.5 m - •
*D =*3 m - •
*D*_{1}= 6 m

Draw a flow net. Calculate the seepage loss per meter length of the sheet pile (at a right angle to the cross section shown).

To determine

Draw the flow net and calculate the seepage loss per meter length of the sheet pile.

Answer

The seepage loss per meter length of the sheet pile is

Explanation

Given information:

The hydraulic conductivity of the permeable soil layer *k* is

The height of the water level

The height of the water level

The depth of permeable layer up to the end of sheet pile *D* is 3 m.

The depth of permeable layer

Calculation:

Draw the free body diagram of the flow net for the given values as in Figure (1).

Refer Figure 1.

Determine the head difference between the upstream and downstream using the relation.

Substitute 6 m for

Determine the seepage loss per meter length of the sheet pile using the relation.

Here,

Substitute *k*, 4.5 m for *H*, 4 for

Therefore, the seepage loss per meter length of the sheet pile is

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