Chapter 13, Problem 13.9P

### 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

# 13.9 through 13.12 Assume that the retaining wall shown in Figure 13.39 is frictionless. For each problem, determine the Rankine active force per unit length of the wall, the variation of active earth pressure with depth, and the location of the resultant.Figure 13.39

To determine

The Rankine active force σa(z=H) per unit length of the wall, the variation of active earth pressure Pa with depth, and the location z¯ of the resultant measured from the bottom of the wall.

Explanation

Given information:

The height (H) of the retaining wall is 29 ft.

The soil friction angle ϕ is 34°.

The angle of wall friction δ is 0.

The unit weight γ of the soil is 119lb/ft3

Calculation:

Determine the active earth pressure coefficient (Ka) using the relation.

Ka=tan2(45ϕ2)

Substitute 34° for ϕ.

Ka=tan2(4534°2)=tan2(4517)=tan2(28)=0.282

Determine Rankine active force σa(z=H) per unit length of the wall using the relation.

σa(z=H)=KaγH

Substitute 0.282 for Ka, 119lb/ft3 for γ, and 29 ft for H.

σa(z=H)=0

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