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20 August, 19:11

Your coworker was impressed with the efficiency you showed in the previous problem and would like to apply your methods to a project at a site with a sandy clay profile. Direct shear test results show a vertical pressure of 80 kPa and the shear stress at failure of 48 kPa. Present your recommendations to your coworker.

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  1. 20 August, 20:40
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    48 = C' + 80 tanФ

    Explanation:

    Recommendations to my coworker

    a) Note that there are two unknowns, C' & Ф in the equation, so minimum of two test readings are required to have correct equation of the failure envelope.

    Given reading of coworker

    σn = 80 kPa

    τf = 48 kPa

    ∴ 48 = C' + 80 tanФ
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