Civil Engineering - UPSC Civil Service Exam Questions - Discussion

35. 

A retaining wall 8 m high with a smooth vertical back retains a clay back fill with C' = 15 kN/m2, φ = 15° and γ = 18 kN/ m3. (Given sin 15° ≅ 0.25). The pressure at the top will, nearly, be equal to

[A]. 35.2 kN/m2
[B]. 23.0 kN/m2
[C]. 27.6 kN/m2
[D]. 11.5 kN/m2

Answer: Option D

Explanation:

No answer description available for this question.

Mrinmoy Nath said: (Apr 2, 2017)  
Answer should be option C.

Abdelhamid Hidar Al Awady said: (Aug 19, 2017)  
Without any calculations there are tension at the top of RW so the value will be -ve then we should choose the lest value from above answer +11.5 true.

Naveen Kallan said: (Sep 15, 2017)  
At the top Z = 0.

So, p = -2C cotβ
β= 45 + 15/2,
p = -23 kN/m2.

Anu said: (Apr 20, 2018)  
Ans should be B.

At top z=0 pa=-2crootka=-2*15*√0.6=23.2kn/sq.m.

Priyanka said: (Jan 12, 2021)  
Yes @Anu.

B is correct.

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