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Question

An embankment is to be constructed with a granular soil (bulk unit weight=20 kN/m3)
on a saturated clayey silt deposit (undrained shear strength = 25 kPa). Assuming undrained general shear failure and bearing capacity factor of 5.7, the maximum height (in m) of the embankment at the point of failure is

A

7.1
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B

5.0
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C

4.5
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D

2.5
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Solution

The correct option is A
7.1
Bulk unit weight,γt=20kN/m3
undrained shear strength,τ=25kPa C=25kPaBearing capacity factor,Nc=5.7At the point of failure
Stress caused by = Bearing capacity embankmentγt×H=CNc H×20=25×5.7Maximum height,H=7.125 m

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