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Question

The standard penetration resistance value obtained in a deep deposit of sand at a depth of 6.0 m was 28. The unit weight of sand is 18.0kN/m3. What is the corrected value of number of blows for overburden pressure?

A
60
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B
57
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C
59
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D
55
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Solution

The correct option is D 55
(d) The effect of overburden pressure on SPT value may be approximated by the equation

N=n×(350σ+70)

where σ is effective overburden pressure in kN/m2 not exceeding 280kN/m2

But σ=γH=18×6=108 kN/m2

N=28×(350108+70)=55

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