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Question
Consider the following statements:
1. According to Terzaghi, the average angle of wall friction may be taken equal to between one-third to two-thirds of the respective angle of internal friction.
2. Wall friction increases the active earth pressure but decreases the passive earth resistance of the soil.
3. Wall friction decreases the active earth pressure but increases the passive earth pressure.
Which of the above statement is/are correct?
A.
1, 2 and 3
B.
1 and 2 only
C.
3 only
D.
1 and 3 only
Answer ( Option D)

1 and 3 only

Solution

(i)    According to Terzaghi, the friction angle between the soil and the wall is generally
(ii)    As the wall friction increases the active earth pressure coefficient decreases and passive earth pressure coefficient increases. This results in decrease of active earth pressure but increase in passive earth resistance of the soil.

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