Severe liquefaction damage was caused to reclaimed land in coastal areas during the 2011 Great East Japan Earthquake.

The ground level has sunk and many houses have tilted so badly on reclaimed land in bay areas around Tokyo such as Urayasu, Funabashi, Yokohama and so on. The phenomenon is usually occurred in saturated loose sandy soils which are more vulnerable to liquefaction damage. If it is possible to presume undrained cyclic strength by means of ground investigation, risks of liquefaction could be predictable. In this paper, a simple estimation method of soil liquefaction using a screwdriver sounding test is proposed. The effectiveness of the assessment method with the sounding test was confirmed through case studies on site investigation.

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