Question

A nomally consolidated clay sample is subject to a triasial test where pore water pressure measurements are made. $A$ consolidaled-undrained type of test is performed. The sample fails (shears) when the total all-around confining pressure is $45 \mathrm{kPa}$ and the total axial pressure is $97 \mathrm{kPa}$. At failure, the recorded pore water pressure is $20 \mathrm{kPa}$. Determine the angle of internal friction $\phi_{\mathrm{CD}}$ for the effective stress strength envelope and also the value for $\phi_{\mathrm{er}}$

   A nomally consolidated clay sample is subject to a triasial test where pore water pressure measurements are made. $A$ consolidaled-undrained type of test is performed. The sample fails (shears) when the total all-around confining pressure is $45 \mathrm{kPa}$ and the total axial pressure is $97 \mathrm{kPa}$. At failure, the recorded pore water pressure is $20 \mathrm{kPa}$. Determine the angle of internal friction $\phi_{\mathrm{CD}}$ for the effective stress strength envelope and also the value for $\phi_{\mathrm{er}}$

Essentials of soil mechanics and foundations : basic geotechnics

David F. McCarthy 7th Edition

Chapter 11, Problem 31

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Step 1

- Total all-around confining pressure, $\sigma_3 = 45 \, \text{kPa}$ - Total axial pressure, $\sigma_1 = 97 \, \text{kPa}$ - Pore water pressure at failure, $u = 20 \, \text{kPa}$ Show more…

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A nomally consolidated clay sample is subject to a triasial test where pore water pressure measurements are made. $A$ consolidaled-undrained type of test is performed. The sample fails (shears) when the total all-around confining pressure is $45 \mathrm{kPa}$ and the total axial pressure is $97 \mathrm{kPa}$. At failure, the recorded pore water pressure is $20 \mathrm{kPa}$. Determine the angle of internal friction $\phi_{\mathrm{CD}}$ for the effective stress strength envelope and also the value for $\phi_{\mathrm{er}}$

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