EFFECT OF THE UNIFORMITY COEFFICIENT AND PLASTICITY ON CORRELATION BETWEEN THE N-VALUE AND LIQUEFACTION STRENGTH OF MIXED SANDY SOIL

Liquefaction prediction is based on liquefaction strength presumed from the N-value. In the case of soil with fine contents, the N-value is revised depending on the content rate(Fc) and the plasticity index(Ip). But the impact of the sand’s uniformity coefficient and fine content’s plasticity against accuracy of liquefaction prediction is not adequately investigated. Based on the above, this research experimentally studied the effect of the sand’s uniformity coefficient and fine content’s plasticity on the correlation between the N-value and liquefaction strength of mixed sandy soil. This research showed the possibility for the risk of liquefaction being underestimated in case where the sand’s uniformity coefficient is low while it tends to be assessed on the safe side if the sand’s uniformity coefficient is high.