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Question
The wall friction of the retaining wall
A.
Decrease active earth pressure but increase passive earth pressure
B.
Decrease passive earth pressure but increases active earth pressure
C.
Decreases both active and passive earth pressure
D.
Increases both active and passive earth pressure
Answer ( Option A)

Decrease active earth pressure but increase passive earth pressure

Solution

Active Earth Pressure
If Φ increases then active earth pressure coefficient decreases.
Passive Earth Pressure
If Φ increases then passive earth pressure coefficient also increases.

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