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Question
Consider the following statements:
1. Coulomb's earth pressure theory does not take the roughness of wall into consideration.
2. In case of non-cohesive soils, the coefficients of active earth pressure and earth pressure at rest are equal.
3. Any movement of retaining wall away from the fill corresponds to active earth pressure condition.
Of these statements
A.
1 alone is correct
B.
1 & 2 are correct
C.
2 & 3 are correct
D.
3 alone is correct
Answer ( Option D)

3 alone is correct

Solution

Coulomb's theory assumes the wall surface to be rough.
Hence statement 1 is incorrect.
In case of non-cohesive soils (Φ ≠ 0) and K0 = 1- sin Φ
(Rankine's earth pressure coefficient at rest)
                                 
(Rankine's Active earth pressure coefficient)
If Φ ≠ 0
then K0 ≠ Ka
Hence statement 2 is also incorrect. 
Any movement of retaining wall away from the fill represents the active earth pressure condition
Hence Statement 3 is correct.
 

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