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Question

In cohesive soils the depth of tension crack (Zcr) is likely to be

A
Zcr2Cγtan(45ϕ2)
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B
Zcr2Cγtan(45+ϕ2)
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C
Zcr4Cγtan(45ϕ2)
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D
Zcr4Cγtan(45+ϕ2)
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Solution

The correct option is B Zcr2Cγtan(45+ϕ2)
Depth of tension crack

Z0=2cγKa

Where,

Ka=1sinϕ1+sinϕ=tan2(45ϕ2)

=1tan2(45+ϕ2)

Z0=2cγ  1tan2(45+ϕ2)

Z0=2cγtan(45+ϕ2)

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