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Question

In a consolidated drained triaxial test a specimen of clay fails at a cell pressure of 60kN/m2. The effective shear strength parameters are C' = 15kN/m2 and ϕ=20. Find the compressive strength of the soil in kN/m2
  1. 105.216

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Solution

The correct option is A 105.216
Given,

¯¯¯σ3=60kN/m2

c=15kN/m2

ϕ=20

We know that,

¯¯¯σ1=¯¯¯σ3tan2(45+ϕ2)+2ctan(45+ϕ2)

=60tan2(45+202)+2×15tan(45+202)

= 165.216 kN/m2

Compressive strength of soil =¯¯¯σ1¯¯¯σ3

= 165.216 - 60

Compressive strength =105.216 kN/m2

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