# 3 Stability Analysis of Earth Retaining Structures

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STABILITY ANALYSIS OF EARTH RETAINING STRUCTURES

Example 1: (Problem 12.9, textbook)

Determine the stability of the concrete gravity wall as shown below.

1) Determine all forces on the wall:

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Tabulate all forces (good way of organizing driving and resisting forces/moments)

Tabulation:

Forces (kN) Lever arm from the toe (m) Moments (kN-m)

Horizontal:

FH= MH=

Vertical:

FV= Mv=

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2) Check OVERTURNING STABILITY (Rotational Stability)

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3) Check SLIDING STABILITY (Translational Stability along the Base)

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4) Check BEARING CAPACITY FAILURE

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Example 2: (Problem 12.10, textbook, modified slightly)

Determine the stability of the cantilever wall shown below and sketch a drainage systemto prevent buildup of pore water pressures behind the wall.

1) Determine all forces on the wall:

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Tabulation:

Forces (kN) Moment arm from the toe (m) Moments (kN-m)

Horizontal:

FH= MH=

Vertical:

FV= Mv=

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2) Check OVERTURNING STABILITY (Rotational Stability)

3) Check SLIDING STABILITY (Translational Stability along the Base)

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4) Check BEARING CAPACITY FAILURE

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