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Question
Standard Penetration Test (SPT) gave an average count of 35 in fine sand below water table, then what is the corrected SPT count?
ekud ços'k ijh{k.k (,lihVh) ty Lrj ds uhps Bhd jsr esa 35 dh vkSlr fxurh nsrk gS] fQj lgh ,lihVh fxurh D;k gS
A.
15
B.
20
C.
25
D.
35
Answer ( Option C)

25

Solution

Dilatancy correction is to be applied when (N') obtained after overburden correction, exceeds 15 in saturated fine sands and silts.
N" = 15 + 0.5 (N' – 15)
Where N" = final corrected value to be used in design charts.
Standard Penetration Test (SPT) gave an average count of 35 in fine sand below the water table.
N" = 15 + 0.5 (N' – 15)
N" = 15 + 0.5 (35 - 15) = 25

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