Question

Determine the values of apparent cohesion and angle of intemal friction for a damp sand using the results of direct shear tests performed on two identical samples of the soil. In test one, the sample shears at a stress of $71 \mathrm{kPa}$ when the compressive (normal) stress is $95 \mathrm{kPa}$. In test two, the sample shears at a stress of $104 \mathrm{kPa}$ when the normal stress is $150 \mathrm{kPa}$.

   Determine the values of apparent cohesion and angle of intemal friction for a damp sand using the results of direct shear tests performed on two identical samples of the soil. In test one, the sample shears at a stress of $71 \mathrm{kPa}$ when the compressive (normal) stress is $95 \mathrm{kPa}$. In test two, the sample shears at a stress of $104 \mathrm{kPa}$ when the normal stress is $150 \mathrm{kPa}$.

Essentials of soil mechanics and foundations : basic geotechnics

David F. McCarthy 7th Edition

Chapter 11, Problem 5

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Step 1

Step 1: Calculate the shear strength for each test using the formula $\tau = \sigma \cdot \tan(\phi) + c$, where $\tau$ is the shear stress, $\sigma$ is the normal stress, $\phi$ is the angle of internal friction, and $c$ is the apparent cohesion. Show more…

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Determine the values of apparent cohesion and angle of intemal friction for a damp sand using the results of direct shear tests performed on two identical samples of the soil. In test one, the sample shears at a stress of $71 \mathrm{kPa}$ when the compressive (normal) stress is $95 \mathrm{kPa}$. In test two, the sample shears at a stress of $104 \mathrm{kPa}$ when the normal stress is $150 \mathrm{kPa}$.

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