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Question

For a railway track 6.0 m high embankment was required. The clay to be used was having cohesion as 20kN/m2 and unit weight of 20.3kN/m3. If the hard rocky stratum was found 3.0 m below the ground level, the permissible slope angle for embankment should be degrees.
(Assume ϕ=0)
Depth factor Df=1.5

Sni0.181530.164300.17445


A
30
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B
26
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C
18
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D
53
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Solution

The correct option is A 30
For permissible slope angle, Fc=1

Fc=CSnrH

Sn=2020.3×6=0.164

Depth factor, Df=H+DH=6+36=1.5

From table, Df=1.5,Sn=0.164i=30

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