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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

In a consolidated-drained triaxial test on a normally consolidated clay, the specimen failed at a deviator stress of 27 lb/in.2. If the effective friction angle is known to be 23°, what was the effective confining pressure at failure?

To determine

Find the effective confining pressure (σ3) at failure.

Explanation

Given information:

The deviator stress at failure (Δσd)f is 27lb/in2.

The effective friction angle ϕ is 23°.

Calculation:

Find the effective confining pressure at failure using the equation:

Δσd(failure)=σ1σ3

Substitute σ3tan2(45+ϕ2).

Δσd(failure)=σ3tan2(45+ϕ2)1σ3

Substitute 27lb/in2 for (Δσd)f and 23° for ϕ

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