Chapter 13, Problem 13.17P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

**13.17 through 13.19** A retaining wall is shown in Figure 13.41. For each problem, determine the Rankine active force, *P _{a}*, per unit length of the wall and the location of the resultant.

**Figure 13.41**

To determine

Find the Rankine active force

Explanation

**Given information:**

The height (*H*) of the retaining wall is 21 ft.

The depth

The unit weight

The sand friction angle

The saturated sand friction angle

The cohesion

The surcharge pressure (*q*) is 0.

The depth

The saturated unit weight

The cohesion

**Calculation:**

Determine the active earth pressure coefficient

Substitute

Determine the total stress

Determine the pore water pressure at 0 ft depth using the relation.

Here,

Take the unit weight of the water as

Substitute *h*.

Determine the effective active earth pressure

Substitute

Determine the total stress

Substitute

Determine the pore water pressure at 4 ft depth using the relation.

Here,

Take the unit weight of the water as

Substitute *h*.

Determine the effective active earth pressure

Substitute

Determine the total stress

Substitute

Determine the pore water pressure at 0 ft depth using the relation.

Substitute *h*.

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