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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

A cone penetration test was conducted in a layer of saturated clay. The cone tip resistance, qc, at 5.5 m below the ground surface was found to be 1150 kN/m2. If the unit weight of the saturated clay is 17.8 kN/m3, estimate the undrained shear strength of the clay. Use Eq. (17.35).

To determine

Find the undrained shear strength of the clay.

Explanation

Given information:

The cone penetration resistance (qc) is 1,150kN/m2.

The saturated (γsat) unit weight is 17.8kN/m3.

The depth (d) below the ground surface is 5.5m.

Calculation:

Find the undrained shear strength of the clay using Equation as follows:

cu=qcσoNk (1)

Here, Nk is bearing capacity factor and σo is total vertical stress.

The bearing capacity factor 18.3 for all cones.

Modify Equation (1).

cu=qc(γsat×d)Nk

Substitute 18

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