Soil Investigation

CORRECTION APPLIED TO SPT VALUE

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The N-value observed during testing is not utilized directly in assessing soil properties. These values are corrected to account for The overburden pressure Dilatancy in saturated fine sands and silts Correction for overburden pressure The penetration resistance of soil depends on the over burden pressure. At deeper depth in-situ soil will have higher overburden pressure … Read more

STANDARD PENETRATION TEST (SPT) – THEORY

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This test involves the measurement of the resistance to penetration of a sampling spoon under dynamic loading The resistance is empirically correlated with some of the engineering properties of soil such as density index, consistency, angle of internal friction, bearing capacity etc. This test is useful for general exploration of erratic soil profile for finding … Read more