Abstract
In the Tokyo International Airport (Haneda Airport), the new offshore expansion project with the fourth runway (D-runway) is being conducted. Undisturbed clay samples retrieved from the planned construction site were examined in the laboratory to evaluate their geotechnical properties. At the sandy layers, the standard penetration test was conducted to evaluate N-value. From the results of the site invesgitaiton, the stratigraphic model at the site was clarified. For the clay layers, a representative depth-profile for each soil parameter was determined by engineering judgement. In addition, the determined depth-profile was evaluated from a statistical point of view in association with the data variation.
