The observed standard penetration test value in a deposit of fully submerged sand was 45 at a depth of 6 m. The average submerged unit weigh

Question

The observed standard penetration test value in a deposit of fully submerged sand was 45 at a depth of 6 m. The average submerged unit weight of the soil is 9.7 kN/m3. The corrected N value is : (consider only overburden correction) (a) 43.76 (b) 67.14 (c) 54.63 (d) 58.95

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Farah 3 years 2021-09-05T14:10:43+00:00 1 Answers 48 views 0

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  1. vankhanh
    0
    2021-09-05T14:11:46+00:00
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    Answer:

    43.54

    Explanation:

    Effective overburden pressure  will be 6m\times 9.7=58.2 kN/m^{2}

    Overburden correction is given by

    C_N= \sqrt{\frac {95.76}{p_o}}

    Where and are effective overburden pressure and overburden correction

    Substituting the value of overburden pressure then

    C_N= \sqrt{\frac {95.76}{58.2}}= 1.282716\approx 1.28

    Taking hammer efficiency of 0.8,  drill rod length correction factor of 0.9 and  borehole correction factor of 1.05 then corrected SPT value will be

    45*1.28*0.8*0.9*1.05\approx 43.54

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